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BrainVision RecView User Manual

1. Name TE Recview pdf IA MRIFilter alll Date modified 5 2 2013 11 18 AM aso Type Adobe Acrobat D JOLI gt Computer windows 05 C Vsion RecView ve Seornfeview Born Burn New folder J Anatomies 8 20 201312 01 PM File folder 8 20 2013 12 BE Desktop M Workfiles 4 30 20137 49 AM File folder 4 30 2013 7 44 babaa 8 20 2013 12 QAAINM 215 DM Annliratian autene tecView exe pplication 3KB 8 20 2013 12 1 E AverageFilter dll Open plication extens 32KB 8 20 2013 12 J 2 BandPowerTrigger d Run as administrator plication extens 60KB 8 20 2013 12 2 BipolarMontage dll Send to N 2 BridgeTool dil R Devexpress Dataan Cut DevExpress Utils dll Copy DevExpress XtraEditc Create shortcut B DevExpress XtraGrid Delete D Maa ee gt 8 FFTFilter dll ee DVD RW Drive D BrainVision Installation FrequencyFilter dll lication extens 8 20 2013 12 8 FrequencyFilter unn lication extens 120 KB 8 20 2013 124 8 LevelTrigger dil 8 14 20133 14PM Application extens 40KB 8 20 2013 124 LinearDerivation dll 8 14 2013 3 14PM Application extens 40KB 8 20 2013 124 2 Loreta dil 8 14 20133 15PM Application extens 620KB 8 20 2013 124 2 Mapfilter dil 8 14 2013 3 14 PM Application extens 44 KB 8 20 2013 124 TKR UMAMI T Command line parameters 65 gt The new shortcut icon us
2. x alal s ee ie FINN Fa Fp2 N io 5 ft e UT c4 P3 P4 y RN NR a WLLL ypa In 01 i WA gn o2 s N Habe CP2 N Dam z il CP6 F8 l N 7 tar Ki M tee ie P7 yy W Sub Delta Ml Delta E Theta E Aipha H Eet P8 I Win eta Fz NA me FFT Map elle Segmentation r GE cz Lht Sub Delta Delta Theta Sgpment Count 72 IE a NTT FC1 S i c ennen i cP1 INOBENRLNRLLBAN KOR cP2 INK BRBEN is is T8 L FC5 H LT Tri Alpha Beta Fz i cps i Wirral at CP6 a N NT Or ven m SR mo mal Mh yh ttt Fos SS ern eog ih mae Vat N un yal kiy ss a n u oi il hl ii elt i S19 19 S19 S19 S19 S19 S19 519 19 SIE Segmenaion Monitoring Standard Montage Blocks Ok Standard Workspace The user interface 47 Figure 3 3 Tabs for switching between filter windows ral WR AA 100 uv t Ps NT TNT N J 1 on s19 s19 19 s19 s19 3 Standard Workspace l Frequency Filter The channel names are shown on the far left of the RecView window At the end of the chan nel list there is a scaling bar see Figure 3 4 The scaling bar is used to assess the signal size If a small number of channels are displayed and there is enough space a scaling bar is show
3. Figure 3 26 Saving the new workspace Ev Date modified Type 8 20 20133 22PM RVWKSP File 5 8 2013 9 00 AM RVWKSP File 5 The newly created workspace is now the current workspace see Figure 3 27 It has taken over the settings of the previous workspace Figure 3 27 Newly created BrainVision1 workspace cr2 100 pV wl ALCL 100 pv Monitoring Standard Montage Blocks Ok BrainVision1 lt None gt When you exit RecView a prompt will ask if you want to save or discard the changes in the filter tree You load an existing workspace by choosing File gt Load Workspace from the menu see Figure 3 28 The workspace concept 63 64 Chapter 3 Getting started and handling the program Figure 3 28 Loading an existing workspace 3 6 Command line parameters D A very convenient method for users who manage several workspaces at a time is to load the desired workspace via a shortcut icon With this quick access functionality you can open RecView with the correct workspace and other parameters loaded For each workspace you can create a separate shortcut To use this function do the following Open the RecView directory gt Right click on file RecView exe and select Send to gt Desktop create shortcut Figure 3 29 Figure 3 29 Create shortcut on the Windows Desktop Organize v Ft Favorites
4. en vH 0 2 ET k BrainVision1 lt None gt 6 11 R Peak Trigger The R Peak Trigger filter is used to detect R peaks in data sets that are not recorded in the MR scanner The filter can only be applied to continuous time data which provide a good ECG signal R peaks The filter cannot be applied to data which is recorded in the MR scanner because the character istic curve of the ECG signal is much less well defined in MR data You must possess administrator permissions in order to use LPT port control Under Win dows Vista and Windows 7 you must also start RecView in Administrator mode even if you are already logged in as administrator at the computer see also section 3 4 on page 58 Figure 6 37 Parameters dialog box for the R Peak Trigger filter r Parameters for R Peak Trigger i Trigger Configuration TTL Pulse Value hex n TTL Pulse Length ms 30 Detection Parameters Use the Following Threshold Threshold pV 300 Estimate Threshold Automatically Time for Threshold Estimation s 10 Peak Polarity Negative v Time Tolerance ms 5 ECG Channel EKG1 The R Peak Trigger filter detects R peaks in the EEG If detection is successful a marker is set and a trigger is sent in the form of a TTL pulse to the LPT port The trigger value can be config ured in the form of an 8 bit hexadecimal value 0 to FF which you enter in the cell TTL P
5. Other settings Navigation Figure 6 26 Part ofthe LORETA filter dialog box containing a list ofthe components ofthe ROI Frontal REO Details of Selected Region of Interest Region Frontal Lobes Frontal Lobe LR Gyri Inferior Frontal Gyrus LR Medial Frontal Gyrus LR Middle Frontal Gyrus LR Blocks x lt 1 2 y 1 2 z 1 2 Nearest voxels to 1 24 22 Anids Value Extracted from Voxels The Anatomy drop down list allows you to choose between various virtual MR anatomical im ages The Remove ROI and Remove All buttons allow you to remove ROIs individually or all at once In the Value Extracted from Voxels group you can specify which value is to be calculated for the virtual channel from the corresponding ROI You can choose the x coordinate y coordi nate z coordinate absolute value of the coordinates or power square of the value The Keep Old Channels check box allows you to specify whether the original channels are to be retained The New Channels on Top check box allows you to specify whether the virtual channels are to be displayed before the original channels in the filter window The Up and Down buttons allow you to specify the order of the ROIs in the data set The Import ROIs button allows you to read in ROIs that have already been created The Ex port ROIs button allows you to export ROIs you have created as an XML file so that they can be used subsequently T
6. The fifth section shows the employed master filter If you have not se lected a master filter the status bar displays the entry None here For information on select ing a master filter refer to Section 3 3 as of page 52 0378 a r a If you use a filter with parallel port control Level Trigger Band Power Trigger R Peak Trigger then the sixth section of the status bar contains a graphic dis play of the status of the LPT port s eight data lines Red stands for the status high and black for the status low Please note that TTL pulses that are reset immediately are not visible in the status bar To be able to use the filter with parallel port control you must specify the address of the LPT port To do this choose Configuration gt LPT Port Address from the menu The main window left shows the data sent by the Recorder The filter window right hand section of the RecView window contains the filters selected by the user see Figure 3 2 Tabs allow you to switch between the individual filters see Figure 3 3 The userinterface 45 Status bar For information on identify ing the LPT port address refer to Appendix C on page 145 You will find detailed infor mation on creating a filter tree in Section 3 4 as of page 53 46 Chapter 3 Getting started and handling the program Figure 3 2 RecView interface mi a BrainVision RecView File Display Montage Configuration Window Help
7. BRAIN PRODUCTS Solutions for neurophysiological research BrainVision RecView User Manual as of Software Version 1 4 3 valid as of September 30 2013 BRAIN ISION professioni RE CY EW Valid until publication of a new version of the manual Blank page Imprint Any trademarks mentioned in this User Manual are the protected property of their rightful own ers All rights reserved including the right to translate the document The content ofthe manual is the intellectual property of Brain Products GmbH No part ofthe manual may be reproduced or distributed in any form by printing photocopying or any other method without the express written permission of Brain Products GmbH Subject to change without notice 2013 Brain Products GmbH Blank page Contents Chapter 1 Chapter 2 Chapter 3 Listof figures er iiRetnslnigssiss bkessunslesge lin wae a ix List f Tables cenrt 2 0 nee Daa be Pee eae cb ehe Leb cet Ts Beek avi ATEA XV Aboutthis manual Fy u ar EAs is i endear 17 The StructureOf the manual een lines eave dea deauenvesveeestsscsacdectecvartese easeupauiees 17 Whois the manualintended for ea ssssh stehen avai spsesesaceeuecaeesesenpeeseesees 17 C nventionssusedin themanuali ierseetesstetsestetnans a ine daadeadencdss ecSeedsesstcadecdoueseee 18 Revision hist ry eu EHRE oc O T E A A A 19 Reporting err rs and support 2 Rn aa iaa ees ULE EEEE E ETER E a 20 MtroductioM i a a TRTE A
8. and technical interference Technical artifacts can be caused by faulty electrodes defects in the apparatus or technical in terference Average Formation of arithmetic mean using segmentation total value of the points divided by the number of seg ments This is performed separately for each EEG channel Average see DELETE THIS MARKER Baseline An assumed horizontal line marking the vertical zero point in the EEG voltage 0 Bipolar connection Montage type in which the differences between two channels are calculated see also Montage BrainAmp family Amplifiers from Brain Products with 32 channels each can be extended that can be used in differ ent fields laboratory acquisition combined EEG fMRI mea surements EEG TMS measurements etc D Digital port Parallel interface over which data can be trans ferred between a computer and peripheral devices Dongle Pluggable copy protection device Drift Drifts are temporal shifts between the averaged arti fact curve and the scanner artifact of each interval This drift is caused when the time of repetition TR of the scanner is BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 155 not a multiple of the sampling rate of the amplifier Conse quently the artifacts of the individual intervals drift by a fraction of a sampling interval even if the Scan Start mark ers are positioned perfectly H High cutoff filter Filter t
9. In the status bar of RecView you can verify if the correct workspace has been loaded Figure 3 32 Figure 3 32 Verify correct workspace 2131 AAB_HC k Windows creates the RecView shortcut on the Desktop but you can move it to any other di rectory on your PC network or external data storage If you move it to a network location or external data storage please make sure to open the shortcut from the PC on which the work space is actually located o 67 AN pter 4 Configuring the user settings To open the dialog box for configuring user settings choose Configuration gt Preferences from the menu see Figure 4 1 The dialog box is made up of six tabs whose functions are described below Most of the configuration options relate to the way in which the data is rep resented Figure 4 1 Calling the Preferences dialog box 3 ajaj AN q 4 1 Configuring the scaling The Scaling tab is used to configure the scaling parameters Figure 4 2 Configuring the scaling parameters r Scaling Axes Graph Display Frequency Bands Electrode Positions Fiter Tree Configuration IV Polarity Positive Down IV Start with Display Baseline Correction On r Time Domain Default Scaling pV fo Default Display Time s fo Frequency Domain Default Scaling uM fo Default Display Frequency Range Hz 250 Set Individual Scaling Factors You can make the following settin
10. a Level Trigger Parallel Port Access Error You must have administrator NO7 rights on your computer to use direct hardware access When you have completed the editing steps described here click Connect to Vision Recorder Rito establish a connection between RecView and the Recorder Start the data view in the Recorder by clicking Monitor The RecView interface is now divided into two parts see Figure 3 22 The main window on the left shows the data sent by the Recorder A master filter may have been applied to this Constructing a filtertree 59 data Depending on the number of filter nodes created the right hand side of the interface contains one or more filter windows This means that each visible filter node in the filter tree has its own data window Figure 3 22 Data representation with a filter tree BrainVision RecView File Display Montage Configuration Window Help x ala l aj ala Al lElvlal Fpl oo oho eee EU ren AF3 IT a oy Arz TTT T TT AF2 AF4 arty miT TTT FT ed pen F5 nn en aa anaana F3 aana 4 Fl a ARN RE Fz poo pt a me F6 LID IMEN F8 AIT TTT eT T tp emt OF FET Ele F Map oma ma Fp
11. must rise or fall uniformly after reaching a local minimum or maximum in order to make it possible for the minimum or maximum to be recognized as such A marker is set for the min imum or maximum within this interval You should adjust the size of the interval to the steep ness of the edges of the trigger channels You should note that RecView requires at least the time specified in Time Tolerance ms in order to reliably detect a peak after its actual occurrence In the Trigger Configuration group you specify what trigger types and trigger values are sent to the LPT port discrete TTL pulses or continuous TTL signals The associated table contains the events Threshold Value Exceeded Peak and Reset Value Under Run Depending on the direction specified in Direction Threshold Value Exceeded indicates that the value set in Level Settings has been exceeded exceeded or under run Reset Value Under Run indicates that the value has fallen below the specified value Peak Found indicates the first local min imum or maximum that occurs during the period between the threshold being exceeded and the reset Please note that RecView sends a single trigger or sets a single marker during the period be tween Threshold Value Exceeded and Reset Value Under Run It does this at the first detect ed local minimum or maximum All further local minimums and maximums during the interval between Threshold Value Exceeded and Reset Value Under Run are ignored If you
12. r Inhibition Period ms You define the threshold value in the Level Settings group You specify a name for the thresh old that you want to search for in the Name column In the drop down list in the Channel col umn you choose the channel on which the threshold is to be searched for You specify the threshold in pV in the Threshold column In the drop down list in the Direction column you specify the direction of the voltage curve in which the threshold violation is defined Positive means that the corresponding trigger or marker is set when the voltage is rising and the threshold is reached Negative means that the corresponding trigger or marker is set when the voltage is falling and the threshold is reached Depending on the direction set in Direction the event Peak see also second row of the table in the Trigger Configuration group indicates the occurrence of a local maximum or minimum value In the Reset Value column enter the value in pV at which the event Reset Value Under Run is provoked see description on this page This value is usually identical with the Threshold but you can set another value for certain purposes If the direction is positive the value ob tained must be below this one before a new Threshold Value Exceeded event can be pro voked if the direction is negative the value obtained must be above this one In the Time Tolerance ms text box you can enter an interval during which the EEG curve
13. 100 pV FC2 m Dann A nen nen 100 pv parenta a ays FCG teen G aaa ae aa 100 pv c3 C i fia a a a ER i ia aa a iai i nn ne 100 pv Cz Caa ma bn aan ane ae AEA S 100 pv ca it tee int aa 0 Let ORDNER neta NAN u VORNE 100 pv CPS Anne tl Ahh lahat ern user a Alternatively right click in the data window and choose a new montage from the context menu see Figure 5 2 BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 You should use the same Work Files folder for RecView as you do for the Recorder to allow you ac cess to the Recorder mon tages 75 76 Chapter 5 Montages Figure 5 2 Displaying and selecting montages B BrainVision RecView le File Display Montage Configuration Window Help 4 ala Alel lslvlase ala Al I Switch off F3 Locall Switch off F3 Globally Standard Montage s FCI FC Eipobn N Wv Wv Averagel 15 15 Bipolar2 1 1 riginal 5 c3 cz wi Wi 15 15 1 1 You can assign keyboard shortcuts to montages to allow you to switch between them see Figure 5 3 Pressing these keyboard shortcuts activates the montages To open the dialog box for selecting the keyboard shortcuts choose Display Montage gt Options from the menu Figure 5 3 Assigning keyboard shortcuts to montages A Montage Options p Default Montage on Startup Standar
14. 136 137 138 pulse ECG detecting 128 R RDA server activating 37 38 Recorder 39 77 78 84 87 89 108 116 152 connecting to 39 44 48 disconnecting from 44 52 impedance mode 50 87 89 missing connection to 48 monitoring mode 89 montage 75 RDA server 37 38 sub license 36 141 143 unblocking 38 rectification 78 79 reference channel 85 129 ROI Region of Interest 103 channel 103 configuring 103 106 exporting 106 importing 106 R peak 115 116 117 127 129 130 131 S sampling interval 121 sampling rate reducing see also downsampling 124 127 scaling 47 67 configuring 67 individual scaling factors 68 108 ROI channel 108 Z scanner artifact 121 125 correcting 121 zero padding 91 segment displaying 119 segmentation 118 status display 45 LPT port 82 97 115 sub license see also license 141 system requirements 25 T TCP IP network connection 25 38 template drift compensation 121 123 template drift detection 123 125 126 test subject requirements placed on 88 90 threshold 82 96 97 98 116 time data 96 110 112 Time of Repetition TR 121 124 125 configuring 124 Time Zero marker 119 toolbar 43 45 topography 110 trigger 81 82 83 96 97 98 115 TTL pulse 45 82 83 97 115 147 149 TTL signal 82 83 97 98 U USB dongle 34 36 141 user account control 33 V voltage difference 85 W window function averaging 79 80 FFT 92 work files 39 folder 39 75 workspac
15. 55 Ifthe output data type of a filter is not compatible with the input data type of the filter to be attached it is not possible to chain these filters thus avoiding interference This is indicated by a prohibition icon For example you cannot attach a Frequency filter input data type time domain real to an FFT output data type frequency domain complex see Figure 3 16 Figure 3 16 Invalid filter combination Frequency filter attached to FFT filter Band Power Trigger Average E Bipolar Bridge Tool Montage FFT Frequency Fiter F Level Trigger Linear Derivation ts han Filters can only ever be combined iftheir data types and segmentation types are compatible Table 3 1 contains all the permitted filter combinations Table 3 1 Combinations in the filter tree ger domain com plex Filter Input datatype Output data Input Output type segmentation segmentation type type Average Time domain Same as input Segmented Segmented frequency do data type main complex Band Power Trig Frequency Segmented Bipolar Montage Time domain Time domain Continuous Corresponds to Filter segmented input segmenta tion type Bridge Tool Time domain Continuous FFT Time domain Frequency Continuous Segmented domain com segmented plex Frequency filter Time domain Time domain Continuous Conti
16. Correction check box the power in the EEG signal is identical odic option for the FFT in before and after the application of the FFT even when a window function is used the Analyzer RecView con figures the right hand mar gin of the window in such a way as to optimize the ana entire filter window see Figure 6 11 If you double click in the filter window again you lytical characteristics ofthe switch back from individual channel mode to the original view window for its periodic con tinuation In both representations frequency graph or map double clicking enlarges it to occupy the Figure 6 11 FFT in the frequency graph view using individual channel mode Tr ITIITTI T ip IV In nt 45 mh Te PERER WINTER nest TY Latian TT Nal 4 0 5 Ay ehe ont nebenher 0 2 ao 80 100 120 140 160 180 Hz W Sub Delta MM Delta Theta E Aipha W Beta s 2 s 1 s2 m Montage Blocks Ok BrainVision1 lt None gt Figure 6 12 FFTin the map view HEN Sub Delta u LHL H tT ta Jy Ta NT REIGN Cone ae ATT TT LTT TP eT TTT tne EBENE _ Theta ef enn LH a an nn _h ufig_nichtz hlen z hl Blume_h ufig_nichtz hlen ontage Blocks Ok BrainVision1 vH 0 1 lt None gt Figure 6 13 FFT filter wi
17. Filter Cutoff Frequency Hz 5 Slope dBioct 24 X Notch Filter Frequency Hz Bo 5 cme Frequency Filter 95 Figure 6 15 Frequency filter eis l lel AN Ea k oA A ase Spinne_selten_nichtzahlen Blume_haufig_zahlen tufig_zahlen Blume_haufig_zahlen len Frequency Filter 96 Chapter 6 Basic filters Summary Prerequisites for use Settings 6 7 Level Trigger The Level Trigger filter allows you to set markers or send configurable signals to the comput er s LPT port as a function of the voltage curve fora selected EEG channel The use of this filter is particularly recommended within the framework of neurofeedback research The filter can only be used with time data You must possess administrator permissions in order to use LPT port control Under Win dows Vista and Windows 7 you must also start RecView in Administrator mode even if you are already logged in as administrator at the computer see also section 3 4 on page 58 Figure 6 16 Parameters dialog box for the Level Trigger filter Level Trigger Parameters Li cle Level Settings Name Channel Threshold Direction Reset Value r F 300 Negative x 250 Time Tolerance ms BE Trigger Configuration C Discrete TTL Pulses N Hysteresis Set Marker Set TTL TTL Value fhex gt Threshold Value Exceeded m o m m 02 Reset Value Under Run m m 3 TTL Pulse Length ms
18. IP address 127 0 0 1 or the name localhost 40 Chapter 2 Configuring the software Creating a new Work Files fold To create a new Work Files folder choose Configuration gt Select Folder for Workfiles and er then select the required folder see Figure 2 9 and Figure 2 10 Figure 2 9 Calling the dialog box for selecting the Work Files folder BrainVision RecView Figure 2 10 Selecting the Work Files folder BU Desktop gt 53 Libraries gt B User s jE Computer 4 amp Windows7_0S C b dl Documents and Settings gt J PerfLogs gt Ji Program Files a Vision a J RecView Ji Anatomies Specifying the LPT port ad If you want to use a filter with parallel port control you must specify the LPT port address dress 1 To do this choose Configuration gt LPT Port Address from the menu refer to Figure 2 11 2 Enter the LPT port address in the text box Hardware Address of LPT Port hex see Figure 2 12 Configuring RecView 41 Figure 2 11 Calling the dialog box to enter the LPT port address amp For information on identify ing the LPT port address BrainVision RecView refer to Appendix C on page 145 Figure 2 12 Entering the address of the LPT port BrainVision RecView 42 Chapter 2 Configuring the software Chapter 3 Getting started and handling the program 3 1 The user interface The menu bar and the toolbar are l
19. Overlapped Segments Select the markers to be used in the Markers group m Markers r Interval Relative to Markers Use All Markers Based on Time Select Markers by Type Start ms fo End ms fo Select the Use All Markers option to use all the markers in the data set gt To use certain types of marker select the Select Markers by Type option and enter the required types in the relevant list To use certain marker names select the Select Markers by Description option and enter the required names in the relevant list The Reset Types and Reset Descriptions buttons allow you to reset your entries for the marker types or marker names The nterval Relative to Markers group allows you to specify the size of the interval to be seg mented relative to the markers You can choose between a time based specification Based on Time and a data point based specification Based on Data Points If you choose to use time based intervals you enter the boundaries and duration of the in terval in the text boxes Start ms End ms and Duration ms If you choose to use data point based intervals you enter the start and end points and the number of data points in the text boxes Start Point End Point and Points Check the Allow Overlapped Segments box to specify that overlapping segments are permit ted If you do not check this box markers are ignored that are too close to the previous mark er Figure 6 41 Segmentation fi
20. bridges occurring now is extremely low 3 Next fill the electrodes that are still glowing yellow with another very small quantity of gel until you reach the optimum impedance values electrode LEDs glow green 4 Apply the Bridge Tool filter again in order to obtain definitive information about the pos sibility of gel bridge formation Make sure that the test subject does not talk move or close his her eyes while the data is being checked using the Bridge Tool filter In our experience it is possible to prepare a cap with 64 or 128 electrodes without a single gel bridge occurring even with long haired test subjects In the case of caps using 256 elec trodes it is possible to apply the gel without forming bridges provided that you perform the preparations carefully Tenke CE Kayser J A convenient method for detecting electrolyte bridges in multichannel electroencephalogram and event related potential recordings Clin Neurophysiol 2001 Mar 112 3 545 50 Tenke CE Kayser J A convenient off line method for detecting electrolyte bridges in multi channel ERP recordings Psychophysiol 2000 37 94 Greischar LL Burghya CA et al Effects of electrode density and electrolyte spreading in dense array electroencephalographic recording Clin Neurophysiol 2004 Mar 115 3 710 20 6 5 FFT Fast Fourier Transform The FFT filter transforms data from the time domain into the frequency domain The resulting data indicates the extent
21. drag the left hand control for the lower threshold value and then the right hand control back into the window You can use the Reset to Initial Con figuration button to restore the parameter dialog settings to their initial values if you have changed them You should note that none of the adjustments you make in Online operation are persistent i e the modified values are not saved as filter parameters If you want to identify the changes you have made during Online operation in your data use the Recorder to set related Comment markers shortly after making each change See the Recorder User Manual for detailed information on how to add comments to your record ing data in the form of markers 6 3 Bipolar Montage Montages enable channels to be reconnected on a software basis The Bipolar Montage filter allows you to assign a channel a second channel as a new voltage reference In this way you define new channels that are derived from the difference in voltage between the two original channels Unlike the montages described in Chapter 5 the Bipolar Montage filter is not used solely for visualization purposes in other words the data generated by the filter affects downstream filters You have the choice of either forming the difference from two consecutive channels in the channel list Each Channel Uses the Following Channel as Reference option or freely select ing the two reference channels using the table Define Reference Ch
22. is identified by the designation SegmentationTypes DefinedByParent This segmentation type indi cates to the program that the output segmentation type is determined by the input type i e the output type of the upstream filter The same logic must be used if you use a filter with a multi value input and output data type You will find a list of available data types and seg mentation types with descriptions in the file RecView nterfaces chm The following parameters are reserved and must be set to O The last and optional filter at tribute indicates whether the filter directly addresses hardware components In this case it does not matter whether you omit the attribute or set it to the value HWAccess None If you want your filter to access the parallel port you should set the value to HWAccess LPTPort If RecView detects a filter whose hardware access attribute has this value then the RecView LPT port status display becomes visible The IDataOut interface receives an IDatalIn interface via the Connect method This interface is stored in the private variable dataReceiver The Connect method is al ways called before any other method of the IDatalIn interface The methods of the IDataIn interface forward the parameters passed to them to dataRe ceiver Depending on the task involved these parameters may be modified or unmodified In our example the setup is modified in IDataIn Start in order to change the name of the channel whose
23. new as of the first data block The advantage of overlapped processing of the data blocks lies in improved continuity in data representation see Figure 6 13 Note that the overlap function is not available for segmented data If you select the Display as Frequency Graph option the FFT data is displayed as frequency graphs for each channel The Show Frequency Band Names check box allows you to switch the graph labeling on and off FFT Fast Fourier Transform 91 Summary Settings Defining the block size 2 Display options 92 Chapter 6 Basic filters If you check the Display as Channel Map of Energy Density box a map of the energy density distribution is displayed for each frequency band You can also set the scaling for the map in Scale Maximum uV Hz FFT data window Since the FFT assumes that the segment will be periodically continued artifacts occurin high frequency ranges due to jumps to the segment boundaries We advise using a window func tion to eliminate these artifacts In the Data Window group you can specify the type of the FFT data window The following three options allow you to choose between different window types No Window Hanning Window and Hamming Window In the Window Length text box you enter the window length as a percentage of the segment length The window func tion is displayed graphically in the filter s parameters dialog box In the same way as the Peri Ifyou select the Apply Variance
24. select the Discrete TTL Pulses option then triggers are sent as TTL pulses to the LPT port All three rows are accessible in the table and TTL pulses can be configured for all three events You can check the associated boxes in the Set TTL column in the table to specify that a trigger is actually to be sent to the LPT port The trigger value can be configured in the form of an 8 bit hexadecimal value 0 to FF which you enter in the cell TTL Value hex The TTL pulse is reset after the time specified in the text box TTL Pulse Length ms if the text box has the value 0 then the pulse is reset immediately Pulses that are reset immediately or very quickly 20 ms cannot be displayed in the LPT sta tus output You should also note that the accuracy of the reset timer depends on the resolu tion of the Windows internal system clock It is therefore not possible to guarantee that timing will be accurate to the nearest millisecond Level Trigger 97 98 Chapter 6 Basic filters For a diagrammatic over view of the behavior of TTL pulses see Appendix D as of page 147 You should also note that TTL pulses are subject to temporal overlaps This occurs if two or more events are detected within the period defined in TTL Pulse Length ms By default in such cases the filter causes the trigger activated by the first event to be overwritten by any subsequent trigger If you want to prevent triggers from being prematurely overwritten check the In
25. that you create a filter tree consisting of three Bridge Tool filters arranged in Bridge Tool 87 Summary Deactivating Impedance mode Settings 88 Chapter 6 Basic filters parallel and assign each filter one of the three settings High Medium Low A bridge alarm should then only be interpreted as indicating a genuine bridge if it appears permanently when Low is set Start RecView The right hand window filter window contains a Paired Channel View cover ing allthe electrode positions If gel bridges are present the view indicates red connecting lines between the relevant electrode positions after about a minute see Figure 6 9 You should note that due to the fact that the view is continuously updated the red connec tion lines may disappear again To reliably identify bridges and avoid creating any artifacts do not apply any more gel You should also make sure that the test subject keeps his her eyes open moves as little as pos sible and does not speak Ifa connecting line is continuously displayed for several minutes then this very probably indicates a genuine gel bridge If a line is only illuminated sporadi callyand then disappears again then this is a false alarm and it is very probable that no gel bridge actually exists It is possible that the Bridge Tool filter may incorrectly interpret artifacts in the EEG as gel bridges This is particularly likely if an electrode has just been filled with gel o
26. the Upper Threshold Exceeded event When the signal is sent to the LPT port the LPT port status is retained until it is reset to the value 0 in response to the occurrence of the Reset event Figure 6 5 Band power trigger filter Band Power Trigger Frequency Interval 9 7656 Hz 13 6719 Hz pv Currently Displayed MaxValue Current Upper Threshold Current Lower Threshold Current Bandpower Value a T Theta Wi Alpha E Beta In many cases it can be difficult to select appropriate threshold values at the start ofan ex Online configuration of the periment In addition the behavior of the EEG data spectrum often changes over long peri Band Power Trigger filter ods of time for example if the test subject becomes tired during a comparatively long 84 Chapter 6 Basic filters experiment For this reason there are two slide controls which enable you to adjust the threshold values subsequently The left hand control adjusts the lower threshold value and the right hand control the upper threshold value After selecting a control you can also ad just it at the keyboard using the Up Arrow and Down Arrow keys You can also use the Scale Up Al and Scale Down z buttons to adjust the scaling in the normal way When you perform scaling it is possible that the two threshold values may no longer be visible in the display window because they are greater than the currently displayed maximum value In this case first
27. the taskbar and then choose All Programs gt Accessories gt Run see Figure 1 2 Alternatively you can press the Windows key amp R c Inthe Run dialog box click Browse and select the CD ROM drive d Double click the file Autorun exe to open it e Click OK in the Run dialog box see Figure 1 3 28 Chapter1 Installation Figure 1 2 Executing the Autorun file under Windows Vista Windows 7 A P Accessories Calculator Command Prompt Connect to a Network Projector 1 Connect to a Projector Documents 1 Getting Started A Math Input Panel Pictures a Notepad 4 Paint Music Games Computer L Sound Recorder Sticky Notes Sync Center Windows Explorer WordPad amp Ease of Access Default Programs B System Tools B Tablet PC Help and Support 4 Back Control Panel Devices and Printers Search programs and files Shut down Figure 1 3 Executing the Autorun file under Windows Vista Windows 7 Windows 8 B San Type the name of a program folder document or Internet resource and Windows will open it for you Open E Autorun exe Lan Cancel Browse 5 When the installation file is run the Welcome to BrainVision Installation dialog box is displayed Click nstall BrainVision RecView see Figure 1 4 The second page of the BrainVision RecView dialog opens Installing RecView under Windows Vista Windows 7 and Windows 8 29 Figure 1 4 S
28. to which the individual frequencies are present in the EEG between 0 Hz and at most half the sampling rate Figure 6 10 Parameters dialog box for the FFT filter FT Parameters A Block Parameters FFT Block Size 1024 a MV Overlap Blocks Overlap in Percent Max 90 25 Display Options C No Window C Display as Frequency Graph Hanning Window a Hamming Window Display as Channel Map of Energy Density Window Length 4 40 Scale Maximum uV Hz i IV Apply Variance Correction FFT Block Size allows you to specify the block size used for calculation expressed as a num ber of data points You can only select powers of 2 The larger the block size the less often the representation will be updated But we recommend that you do not select too few data points as this may overload the computer and possibly cause data blocks to be lost Because the block size must always be a power of 2 the required block size is always zero padded to the next power of 2 with segmented data This means that a data block that does not already have a length corresponding to a power of 2 is padded with zeros If you check the Overlap Blocks box the blocks are not processed sequentially but are in stead overlapped The percentage by which the blocks are to be overlapped is specified in the Overlap in Percent Max 90 text box This value is restricted to 90 If for example you select an overlap of 75 only 25 of the data points are
29. values are to be set to 0 The modified copy is then forwarded to dataReceiver IDataIn AddData also selects the same procedure namely modifi cation of a copy for the received data Never modify the original data if this was passed in the form of an object reference Any change might affect other filters The IFilterParameters interface receives and returns a text via the Parameters prop erty This text can easily be converted to and from parameter variables using the Xm1Seri alizer class of NET IFilterParameters EditParameters opens a dialog box where the user can enter parameter variables Sample filter 2 Another example filter the SimpleViewExampleFilter already mentioned displays a smiley whose smile depends on the proportion of alpha waves in the total spectrum of the EEG The proportion of alpha waves is also displayed in numeric form on the top left of the output window This filter only accepts complex frequency data as supplied by FFT This means that frequen cy analysis within the filter is extremely simplified because the FFT filter has already convert ed the data to frequency data In this case the IDataIn interface is implemented as well as the Simpl eView interface The window in which the data is displayed is not bound to the RecView interface but can be moved freely This allows you to use the entire screen for biofeedback output Programming examples 137 138 Chapter 8 Programming user defi
30. 00 pv 200 pv a i m y I HN LORETA 103 6 9 LORETA The LORETA filter allows you to view the EEG data as LORETA data over the time domain Re Summary gions of interest ROIs are defined for this purpose Each ROI is displayed in RecView as a virtual channel The virtual MR anatomical images are made available by the Montreal Neurological Insti tute of McGill University Figure 6 21 Parameters dialog box for the LORETA filter Settings P E Loreta Transformation Definition of Regions of Interest New ROI A Anatomy Average305 A Details of Selected Region of Interest Value Extracted from Voxels C XCoordinate C Y Coordinate C Z Coordinate C Absolute Value C Power Import ROIs Keep Old Channels ee z Export ROIs In the LORETA filter dialog box click New ROI to create a new ROI see Figure 6 22 The New Defining the ROIs Region dialog box appears in which you can enter the name of the new ROI The name you enter here is also the name of the virtual channel Figure 6 22 Creating an ROI BrainVision RecView A Loreta Transformation Definition of Regions of Interest New Region New ROI Remove R Name of New Region of Interest Fowl 104 Chapter 6 Basic filters To add lobes to the ROI click Add Lobe The Left Both and Right options allow you to choose whether the left right or both lobes a
31. 013 142 Appendix B Installing the RecView license from the Brain Products web site Installing sub license files Figure B 2 Login form About Brain Products paomane URA10125 Projects amp References Password Workshops amp Events en LELLES Products amp Applications Distributors 3 Login Downloads amp Support Order amp Return Shipment If you do not have a login yet please register here If your login doe Please note that cookies have to be accepted to login Now you can select and download the sub license file License File for Analyzer 1 and or Re corder from the download area under Downloads amp Support gt Downloads see Figure B 3 Figure B 3 Download area for sub license files pads amp Support gt Register your product here w t Registration yads i i gt Return Shipment BrainVision Analyzer BrainVision Recorder gt BrainVision Analyzer 2 gt BrainVision RecView gt Dongle Driver gt Electrode Caps gt Manuals gt Tutorials amp SetUp Poster gt Scripts amp Tools gt Brain Products License Files Ca License File for Analyzer 1 and or Recorder Type exe Size 118 2 KB A sub license file is an executable file It automatically installs the sub license in the correct folder Start the executable file and then click Continue to install the sub license see Figure B 4 Then follow the instructions in the automatic installation routine Installing the Rec
32. 1 Fp2 AF3 FC3 m hi be 3 AFI AFz AF2 de RR fis kun Fc2 FCA LA LLLI BERRA AF4 F7 F5 LELLI b b bu Foe i LTY jn m tn F3 F1 Fz T Nitta panenka A ee a a aaa aira Le a a AALE h ALLL E iiti E2 F4 F6 a a ke a F8 Cz a c2 E Sub Deita Ml Delta E Theta E Aipha MA I E Beta 2 0 2 today L Ti m Spinne_selten_zahlen Blume_haufig_nichtzahle Blume_haufig_nichtzahlen z hle Segmertaton Seamertation Average Mao _ FFT Monitorina Standard Montaae Blocks Ok Standard Worksoace I lt None gt 60 Chapter 3 Getting started and handling the program You will find a detailed de scription of the RecView user interface in Section 3 1 as of page 43 You can change the ratio between the main window on the left and the other filter windows by dragging the split bar between the windows to the left or right with the mouse The tabs below the filter windows allow you to switch between the individual filter windows see Figure 3 3 on page 47 You can change the arrangement of the filter windows using the Window menu see Figure 3 23 Cascade cascades all the open filter windows one after another gt Tile Horizontally arranges the windows one above the other gt Tile Vertically arranges the windows next to each other Figure 3 23 Functions for arranging the filter windows RecView Montage Configuration Help Arrange Icons Cascade Tile Horizontally Tile Vertica
33. 100 pV R 4 R1 2 RA PB Monitoring Standard Montage Blocks Ok Brain Vision 1 lt None gt 7 2 Pulse artifact filter The Pulse artifact filter detects the heartbeats i e the R peaks on a specified ECG channel and initiates a correction process for the EEG channels for every detected pulse period The functionality of the filter falls into the following phases Downsampling Since it is necessary for the filter to process a large quantity of input data in a relatively small time its performance improves inversely to the sampling rate of the input data For this rea son the filter has an optional preprocessing stage that allows you to reduce the sampling rate of the input data The training phase In order to detect the position of the R peak on the ECG channel the Pulse artifact filter must find and store a pulse pattern with a distinct R peak This is done within a fixed period when the filter first starts to be used This period is referred to as the training phase in this docu ment The default value for the duration of the training phase is 15 s You can change this Pulse artifact filter 127 Summary 128 Chapter 7 Optional filters duration During the training phase the pulse is neither marked nor corrected If no pulse pattern is detected after the planned training phase the training phase is repeated with ref erence to the following sections until a pulse pattern is successfully detected Pulse detectio
34. 3384 0 Fax 49 8105 73384 505 Web site http www brainproducts com Email techsup brainproducts com On request the technical support team will also send you a form to assist in clarifying faults and problems J Introduction RecView and its functions The BrainVision Recording Viewer referred to below as RecView is an add on module for the BrainVision Recorder recording software that allows you to assess the quality ofthe EEG recording RecView allows you to process the recorded data in real time and provides a num ber of Online processing filters for this purpose In addition to traditional signal processing filters such as the Frequency filter or the FFT filter RecView also provides special filters for correcting scanner and pulse artifacts for data re corded during combined fMRI EEG measurements The Segmentation filter and Average filter allow you the option of viewing your data by seg ment and carrying out event related and marker based analyses You can use the extended Average filter to calculate weighted averages with various weighting functions in both the time and frequency domains The FFT filter possesses configurable window functions to improve the calculation of the fre quency spectrum The LORETA filter allows you to calculate virtual channels over regions of interest and to use the LORETA method to trace signals back to their sources in the various regions of the brain The Linear Derivation
35. 64 p Linear Derivation Save to I7 Keep Old Channels 7 New Channels on Top Number of Used Input Channels Load fror Refresh Used Input Channels Fpl Fp2 AF3 AFI AFz AF2 001886879 0 01950607 0 05276779 0 005698975 0 01113171 0 0010865 0 01216254 0 02667836 0 02508937 0 0003135398 0 01188219 0 0165563 N 0 01004132 0 02798324 0 002041995 0 0009478853 0 01980104 0 0068015 z 0 005132434 0 001959419 0 007568133 0 0158857 0 005495728 0 00696181 x 0 0002894236 0 005805029 0 001035406 0 01009123 0 008764028 0 0020466 h 0 005706147 0 03689781 0 008421344 002429723 0 002563838 0 00450s8I n 005768489 0 01407431 0 03182536 0 09146169 0 009975952 0 0030411 F E O a S cists z 0 0183203 0 01267678 0 008130919 0 0008843155 0 0004004566 0 0013863 0 01496931 0 01919437 0 02875056 0 0248083 0 02428289 0 0198048 0 04581244 0 005888857 0 0203287 0 002257296 003781291 0 0246052 nNn99RN029 A IRTARTEN NNNA919191 N MIANRIAR NnMTATLALR N NNAIR Ifyou select the Keep Old Channels check box the old channels are included in the new data set that makes the new channels additional channels If you do not check the box the new data set consists only of the new channels If you select the New Channels on Top check box the new channels are listed first In the Number of New Channels text box you specify the number of new channel
36. E A E ER T TA EAE ees 21 Recview nd its FUNCTIONS orisissrecrerissirds rriste a Ea E e OS ESASEN TELER ETE ETS 21 Intended USE simini E EE EE EE EE E EEE E 22 COMPO CEILS E n a EE EEEE E E VKO O E E TE NA 22 Use together with other products and components sssssssssssseeesssssssssssssssesrereeeeesesssssssssesseerreeeeeeeesssssssssee 23 Installation a a E dae ud asses GR A Eain 25 1 1 Installing RecView under Windows XP cccccccccccccceseseessesecececcccccceesaeaeeesssseeeeececceeseeeseeeeenensees 26 1 2 Installing RecView under Windows Vista Windows 7 and Windows 8 ssssssesesesssssssssssssee 27 Configuring the software cuesseessesseessessenssessennaennnnnsnnnennsennnnsnennennsennensaensennsennenssnssenssesnenssensensnenne 35 2 1 installing the RECVIEW licens Ennion etne K ALSE EEE ARATE eah 35 2 2 Configurinethe Recorder 2 8 2 Aa E E E RO a 37 2 3 Configuring RECVIEW anna ON hier SANAE EEEE AaS 39 Getting started and handling the program 0 cee ccccesscssesecesessecenecsseeceesecsseeeesseeeeesneceseeseeeeees 43 3 1 Theuserinterface ni SER e E E seeeeaes sa neeossandetoedocv ecdencedcnseaeds iE eT G 43 3 2 Performing aisimple session sis eaten iad hee cet eae E EEES 48 3 3 Selecting a master fieis esse ee aves Geass steinerne a ae web behave Wes eee 52 3 4 Constructing filter ENCE sssrinin erin iae ERE a N a aiSia 53 3 5 The Workspace concept u a ri E Ei EAR 62 3 6 Command line p rdmet TS re see u
37. Economic Community EMGuSisssssbesteseosstpautess Electromyogram EO Giner 532285 Electrooculogram Ela European Union FE Fast Fourier Transform IMRI ieser tes Functional magnetic resonance imaging CA en Independent Component Analysis EC ee International Electrotechnical Commission DR nung Linear derivation LORETA 2 22 2252 Low Resolution Brain Electromagnetic Tomography LPT 42e 32220 5342468 382200 8 Line Print Terminal MN EEE Montreal Neurological Institute MRI a 882 Magnetic Resonance Imaging ROM GG ns cadences Region of Interest TEP P 25 Transmission Control Protocol Internet Protocol TR ante Time of Repetition E p i EEEE 88002 Transistor transistor logic BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 154 List of abbreviations Glossary A actiCAP ControlSoftware Software from Brain Products that allows the actiCAP active electrode system to be controlled and configured The actiCAP ControlSoftware can also be controlled from the Recorder Amplitude Maximum deflection ofthe EEG curve in uV mea sured from peak to trough Analyzer Software from Brain Products for analyzing EEGs and other physiological signals and which is able to read and evaluate different file formats from various vendors Artifact All potential shifts in the EEG recording that do not have their source in the cortex Artifacts can be subdivided into those related to the test subject physiological artifacts
38. View license from the Brain Products website 143 Figure B 4 Installing sub licenses H BrainProducts License 20090108 1408 This program will install the Brain Products elo You can check what sub licenses are active by choosing Help gt About BrainVision Recorder from the Recorder menu see Figure B 5 Figure B 5 Displaying sub licenses in the Recorder Brainvision Recorder Version 1 20 Copyright 2000 2009 Brain Products GmbH Hasp HL S N 102151 Analyzer Recorder combined dongle Sublicenses sion Video Vision RecView MRI Correction The installed sub license is stored in the Windows system folder as a file with the exten sion bplcs e 144 Appendix B Installing the RecView license from the Brain Products web site Appendix C How can I find the address of the LPT port If your computer has only one parallel port LPT1 then its hardware address is usually 0378 default value If you computer has a second parallel port then its hardware address is usu ally O3F8 If the default address is not the correct address then you can identify the address as follows 1 Open the Windows Device Manager 2 Inthe Device Manager choose the entry Ports COM and LPT 3 Todothis right click the line ECP LPTx Printer Port and choose Properties from the con text menu that appears 4 The dialog box ECP Printer Port LPTx Properties appears 5 In this dialog box choose the Resources tab
39. a 7 Sr TAERE Name Type E BrainProducts License 20130115 1110 exe Application 3 Libraries Open B Run as administrator N A Computer amp Windows7_0S C Ban s Removable Disk D Cut i litem Create shortcut BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 36 Chapter 2 Configuring the software 3 Then connect the USB dongle supplied with the BrainVision program DVD to one of the USB ports of your computer To check whether you have a dongle with a RecView license start the Recorder and choose Help gt About BrainVision Recorder from the menu see Figure 2 3 Figure 2 3 Calling Recorder program information Ifyou have a suitable USB dongle the line Vision RecView is shown under Sub licenses see Figure 2 4 Figure 2 4 Displaying sub licenses in the Recorder Copyright 2000 2013 Brain Products GmbH E BrainVision Recorder Version 1 20 0506 Hasp HL N 106121 nalyzer Recorder combined dongle Dongle Expiration Date Unlimited Sublicenses BDF File Format Note If a sublicense has expired please contact your local dealer or our support at techsup brainproducts com Configuringthe Recorder 37 2 2 Configuring the Recorder To start RecView activate the Remote Data Access server RDA server in the Recorder gt You will find detailed infor mation on using the Re 1 Todothis choose Configuration gt Preferences from th
40. ability for the results obtained with RecView Correct use BrainVision RecView is permitted to be used by users in the psychological and neurophysio logical research area as well as physicians and medical experts BrainVision RecView is not permitted to be used by gt unqualified persons e g laymen gt people who personally cannot read or understand the User Manual e g due to insuffi cient language knowledge due to blindness BrainVision RecView can be used to view and filter neuro electrophysiological signals from healthy and sick adults children and animals Irrespective of any liability on our part the specialist staff must observe the relevant national stipulations for operators and other relevant national legislation If you record EEG ExG signals in an MR scanner the computer must always be positioned and used outside the scanner room 1 EEG EOG ECG EMG EDA etc All versions of BrainVision RecView that have been released into the market as medical prod ucts do remain medical products Brain Products will continue to treatthem as medical prod ucts i e to perform post market surveillance for example until the end of their service life The user should be aware that if a former BrainVision RecView version that was a medical product is replaced by a newer version that is not a medical product anymore the terms and conditions of the new BrainVision RecView version are effective only from then on Use t
41. ae aan einsehen caches tauwaetecdiadance SET 103 6 10 MAD aisdscecscctocuscuacroatsdts ssaceachech oobdesdasaseseososcencctasaseussuaueatusasedccissedeedeeavensesedcesessdecoeanwabesisavelveseecs 110 6 11 R Peak Trigger cescccvsconsvsessevseseecssteccuscvessedecdecvecdectedsesvesnecdessesdesveccesectackecteevoseveesevcdedaesteceesensents 115 6 12 SESMEHLALIONN Tee nee Bere NE ae LN Cae CaN Eevee Co RE eR 118 Optionalifilters u EEE RE SA RE a A E ih in 121 7 1 A T a a A EE T E E EE TT 121 7 2 Puls amp artifactfilten c EB Rn E el hi ENAERE ES 127 Programming user defined filters cc cessesssscsscssssscsscessssesseeseesessesseesssecseseesseseesaessesaseesensees 133 8 1 ODAIA VIIES AP O E T A EN E E 133 8 2 Interfaces u rn e E A A E E E eae N AERES 134 8 3 Programming examples 2 codepsetevactieusectestesuecdaaseocatesszccucevasevcvagunonsebedeeceateuepegbesieatecios 136 Appendix A Appendix B Appendix C Appendix D Appendix E Electrode coordinate system ccccecssssssssssssssssssscsssssssscsssssessesceseescssesesesssssessessesaesaesaeeseeseess 139 Installing the RecView license from the Brain Products web site cscsssssssessesseseeseeeeees 141 How can I find the address of the LPT port ccccsssssssssssscssesscssesscsssescsecsessessessesseseeseesseensees 145 Behavior of TTL pulses in different parameter configurations 200000000senenennnenenenenn 147 Legaln t
42. also choose a voltage value which ap proximates to the straight line drawn in on the graph this only affects the option Use following Threshold Figure 6 38 Negative ECG curve negative polarity with steep R peaks You should enter the channel with the best signal quality among the recorded ECG channels in the ECG Channel text box Figure 6 39 R Peak Trigger filter Zr Sas Sa o Pe Eeeeeee See e yi e Pulse Pulse Pulse Pulse Pulse Pulse Ekg1 pu Ekg2 Ym 100 pv Pulse Pulse Pi 4 Cc N R Peak Trigger Frequency Fiter 0378 eeesneunesn R Peak Trigger 117 118 Chapter 6 Basic filters Summary Settings 6 12 Segmentation The Segmentation filter allows you to cut out segments of the complete data set of the EEG on the basis of all markers or selected markers Note that in contrast to the Analyzer it is not possible to select the marker names or marker types e g stimulus reaction instruction from a drop down list as this information is un known to the program at the time the parameters are passed Consequently you must enter the names and type descriptions manually The entries are not case sensitive Figure 6 40 Parameters dialog box for the Segmentation filter Select Markers by Description Spinne_selten_zahlen Reset Descriptions Duration ms fo Based on Datapoints Start Point 50 End Point foo Points fi 51 IV Allow
43. alue is 10 You should not use any value greater than 15 When the period specified in Time for Threshold Estimation s has elapsed the threshold value is updated at periodic intervals This results in a continuous and more stable detection of R peaks You enter the polarity of the R peaks in the Peak Polarity text box To determine the polarity view the data briefly in RecView or in the Recorder In the Time Tolerance ms text box you can enter an interval during which the ECG curve must rise or fall uniformly after reaching a local minimum or maximum in order to make it possible for the minimum or maximum to be recognized as such Please note that the R peak marker is set at the time when an R peak is recognized as such In the data it therefore ap pears offset from the real R peak by the value specified in Time Tolerance The ideal length of the Time Tolerance interval depends on the characteristics of the R peaks In Figure 6 38 the R peak in the ECG curve rises very steeply After reaching the local minimum the curve falls steeply again As a result a comparatively short time interval should be chosen in this case On the basis of the ECG curve characteristics you should also choose the polarity and if you are not using automatic detection a suitable Threshold value In our example see Figure 6 38 we select Negative for Peak Polarity since the upward R peaks are better de fined than the downward ones For the Threshold we
44. annels option The Clear all button allows you to delete all specifications from the table If you check the Display Old Channels box the original channels are displayed alongside the newly defined channels Figure 6 6 Parameters dialog box for the Bipolar Montage filter Bipolar Montage x Each Channel Uses the Following Channel as Reference Define Reference Channels Channel Channel F3 Fz F4 FC5 FC1 FC2 F c3 Cz Clear all Display Old Channels OK core Summary Settings Bipolar Montage 85 86 Chapter 6 Basic filters Figure 6 7 Bipolar Montage filter FC1 FC2 100 pv C3 Cz 100 pv 6 4 Bridge Tool You can use the Bridge Tool filter to detect any gel bridges that may potentially exist between neighboring channels Gel bridges occur when the conductive gel that is used to reduce the skin s electrical resistance spreads across the skin of the test subject s head This creates connections or bridges between neighboring electrodes and the corresponding channels are for practical purposes short circuited The signals in the affected channels have an ab normally high level of similarity The Bridge Tool filter recognizes this abnormally high simi larity between neighboring channels and displays this in graphical form Using the Bridge Tool filter reduces the probability that you will create gel bridges when pre paring the
45. ard to the test subject the user and or a third party Failure to observe the information in these Operating Instructions constitutes incorrect use Damage to property This symbol indicates that incorrect use of the devices may bring about an urgent risk of damage to property Stop This symbol indicates that you should not carry out a particular action Cross reference This symbol indicates a reference to a related chapter section or document Note This symbol draws your attention to important information relating to the current topic Tip This symbol draws your attention to recommendations on how to use our products New This symbol indicates that the Operating Instructions have been changed or that new material has been added at this point Revision history Page Status Subject 22 nisse changed Intended Use 22 as NOW sccscsdecoases Correct use DI asepa NEWS Combination with other products BD lese NEW Linear Derivation supports frequency domain OU lien NOW en Workspace quick access function About this manual 19 20 Aboutthis manual Reporting errors and support You can search for updates of this manual on our Web site under www brainproducts com downloads php kid 5 amp tab 2 If you require technical support or if you discover a mistake in the manual the software or during operation please contact Brain Products GmbH Zeppelinstra e 7 D 82205 Gilching Tel 49 8105 7
46. at are not to be corrected Entera comma between the channel names It is usual to exclude the ECG channels from correction to make it easier to identify whether the R peaks are set correctly or whether the detec tion or correction parameters need to be adjusted Under Downsampling before Correction you can use Do Downsampling To specify whether downsampling is to be performed as a preparatory step or not If you check this box then the Downsampling to 250 Hz checkbox is also activated Downsampling to 250 Hz Ifyou check this box then the sampling rate is automati cally reduced to 4 ms 250 Hz Alternatively enter the downsampling factor you require as an integer in the Downsampling with a Factor of text box You can use Suppress Marker Display to hide markers Hide Markers With Descrip Check this box if you want to hide specific markers in tion s RecView Enter the marker name in the Suppress Marker Display text box e g R128 If you enter more than one marker name separate the names with commas Any markers you hide in this way are not removed but are simply no longer included in the display As a result you can continue to use these markers for example when performing subsequent segmentation Pulse artifact filter 131 Figure 7 5 R peak marker and correction of a channel imv Pulse artifact Filter cs Ok Brain Vision 1 lt None gt Downsampling is mandatory for inputs of 5000 Hz and m
47. can perform an optional baseline correction priorto averaging To do this check the En able Baseline Correction box You can now specify whether baseline correction is to be performed relative to the start of the segment Interval Relative to Start of Segment option or relative to the marker Interval Relative to Marker option In both cases the next group allows you to define whether the interval is to be determined on the basis oftime Based on Time option or on the basis of data points Based on Data points option If you choose to use time based intervals you enter the boundaries and du ration of the interval in the text boxes Start ms End ms and Duration ms If you choose to use data point based intervals you enterthe start and end points and the number of data points in the text boxes Start Point End Point and Points Ifyou define an intervalthat does not lie within the segment boundaries the program creates the intersection between the interval you select and the segment that is actually present If the intersection is empty no baseline correction is performed If you wish you may rectify and prepare the signal blocks priorto averaging To do this select the Enable Rectification check box The data blocks can be rectified by forming the absolute value Absolute Values option or by forming the squared absolute value Squared Absolute Values option The squared value is used to measure the power density spectrum To ca
48. cord er recording software before you can start viewing and recording data In Chapter 3 you will learn how to operate RecView Chapter 4 provides information on configuring the user specific settings Chapter 5 describes the use of montages Chapter 6 and Chapter 7 describe all the filters that are available for RecView vyv v Vv v y In Chapter 8 you will find information on how to program your own filters Who is the manual intended for The current User Manual is intended for users in the psychological and neurophysiological research area as well as physicians and medical experts BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 17 18 About this manual Conventions used in the manual The manual uses the following typographical conventions italic underscore monospaced Italic text is used to identify menus menu commands dialog boxes but tons options and the names of files and folders Italic font is also used to highlight portions of running text Underscored text indicates a cross reference or a web address A monospaced font is used to indicate text or characters to be entered at the keyboard such as source code and programming examples The blue dot indicates the end of a chapter The manual also uses the following symbols to help you find your way around gt OP P Personal injury This symbol indicates that incorrect use of the devices may result in a health haz
49. d Montage v Shortcuts for Montage Selection Key Associated Montage Ctrl 1 Ctrl 2 Bpo z Ctrl 3 Bpo z Ciri 4 aveese gt Standard Montage v Ctrl 5 Bipolar1 Ctrl 6 Bipolar2 iginal1 Ctrl 7 v Ctrl 8 v Ctri 9 v Ctrl 0 v Press Shift together with the montage hotkey to select the montage for the active tree filter window OK J You can freely assign the keyboard shortcuts Ctrl 2 gt through lt Ctrl 02 to the existing mon tages Ctrl 1 gt is reserved for the default montage If you have created a filter tree you can use the shortcuts lt Ctrl Shift 1 gt through lt Ctrl Shift 0 to select the montage for the ac tive filter window You also have the option of selecting a montage that will be used by de fault when data is first displayed in RecView Default Montage on Startup o 77 AN pter 6 Basic filters Note that any software filters such as Segmentation Filters that are active in the Recorder By have NO effect in RecView Figure 6 1 Software filters active in the Recorder have no effect in RecView r T Recorder File IV High Cutoff Filter Frequency Hz 70 70 a a 70 Fcs 0 3 0 531 70 BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 78 Chapter 6 Basic filters Summary Settings 6 1 Average The Average filter is used to average previously segmented data or frequency data The Aver age
50. ds The channels selected in Used Channels are used for the calculation The result is divided by the number of channels used In the Trigger Configuration group you specify what trigger types and trigger values are sent to the LPT port discrete TTL pulses or continuous TTL signals The associated table contains the events Upper Threshold Exceeded and Lower Threshold Under Run Upper Threshold Exceeded indicates that the value specified in Upper Bandpower Threshold has been ex ceeded Lower Threshold Under Run indicates that the value has dropped below that spec ified inLower Bandpower Threshold If you select the Discrete TTL Pulses option then triggers are sent as TTL pulses to the LPT port The status of the LPT port is reset to O after the period defined in TTL Pulse Length In this mode both rows can be accessed in the table and TTL pulses can be configured for both events You can check the associated boxes in the Set TTL column in the table to specify whether you actually want the event to release a trigger The trigger value can be configured in the form of an 8 bit hexadecimal value 0 to FF which you enter in the cell TTL Value hex In the TTL Pulse Length ms text box you specify the time after which the TTL pulse is reset to 0 If you enter the value 0 in the text box then it is reset immediately Pulses that are reset immediately or very quickly 20 ms cannot be displayed in the LPT status output You should also note that th
51. e 43 45 62 134 creating 62 loading 63 64 saving 63 Subject index 159 160 Subject index
52. e accuracy of the reset timer depends on the resolution of the Win dows internal system clock It is therefore not possible to guarantee that timing will be ac curate to the nearest millisecond You should also note that TTL pulses are subject to temporal overlaps This occurs if two or more events are detected within the period defined in TTL Pulse Length ms By default in such cases the filter causes the trigger activated by the first event to be overwritten by any subsequent trigger If you want to prevent triggers from being prematurely overwritten check the Inhibit additional TTL Pulses for box and specify the required inhibition period in the n hibition Period ms text box Events that are detected during the inhibition period do not trigger any additional TTL pulses Band Power Trigger 83 If you enter identical values in the nhibition Period ms and TTL Pulse Length ms text box x For a diagrammatic over es this prevents triggers from ever being overwritten By choosing an inhibition period that view ofthe behavior of TTL is longer than the value specified in TTL Pulse Length ms you can prevent TTL pulses from pulses see Appendix D as of page 147 occurring more frequently than you would want If you select the Hysteresis option then continuous TTL signals are sent as triggers to the LPT port In the table you can now only access the Upper Threshold Exceeded row i e it is only possible to configure a TTL signal for
53. e distribution THIS SOFTWARE IS PROVIDED BY THE AUTHOR AS IS AND ANY EXPRESS OR IMPLIED WAR RANTIES INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FORA PARTICULAR PURPOSE ARE DISCLAIMED IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT INDIRECT INCIDENTAL SPECIAL EXEMPLARY OR CONSEQUEN TIAL DAMAGES INCLUDING BUT NOT LIMITED TO PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES LOSS OF USE DATA OR PROFITS OR BUSINESS INTERRUPTION HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY WHETHER IN CONTRACT STRICT LIABILITY OR TORT INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 152 Appendix E Legal notes Notes for RecView users in the USA You should note that the use of our devices and software other than for the intended use de scribed in the present User Manual may represent an infringement of certain industrial prop erty rights arising out of US patent number 5 445 162 You should therefore note that the following procedures for use must be observed Recording must be performed outside the MRI room The PC or laptop used to record and store the signals must not be located in the MRI room Brain Products GmbH accepts no lia bility in the event of any non compliance with these instructions and the original intended use We acce
54. e little or no security What are the risks of allowing a ram through a firewall 2 3 Configuring RecView Proceed as follows to configure RecView for the data view 1 Start RecView by double clicking the RecView shortcut D which you will find on your desktop after installation has been completed successfully Alternatively you can call RecView from the task bar Windows XP or the Start but ton Windows Vista Windows 7 by choosing Start gt BrainVision RecView 2 You must now specify what computer in the network the Recorder is running on To do this choose Configuration gt Server from the RecView menu see Figure 2 1 The Serv er dialog box appears 3 Here you enter either the IP address or the computer name see Figure 2 8 Abbildung 2 1 Calling the Server dialog box G BrainVision RecView Figure 2 8 Entering the server name r BrainVision RecView File Display Montage Configuration Window Help Enter the name of the computer where the Vision Recorder runs Alternatively enter the IP address fbear L ok came If a version of the Recorder is already installed locally on the computer RecView takes the folder specified for work files from this installation This folder is known as the Work Files folder The work files include the workspaces and montages Configuring RecView 39 If the Recorder is on the lo cal computer enter the
55. e menu see Figure 2 5 corder in the associated User Manual 2 Inthe Preferences dialog box open the Remote Data Access tab 3 Check the Enable Remote Data Access box see Figure 2 6 Figure 2 5 Preferences in the Recorder menu la W ul aa Figure 2 6 Activating the RDA server in the Recorder 38 Chapter 2 Configuring the software While it is being displayed the EEG data can now be passed via TCP IP to other programs on the local computer and to computers in a network The RDA server of the Recorder uses the TCP IP ports with the port numbers 51234 and 51244 If you are running a firewall on your computer it will issue a message when you acti vate the RDA server You can specify that the Recorder software should no longer be blocked see Figure 2 7 Alternatively some firewalls allow you to enable TCP IP ports 51234 and 51244 explicitly For further details refer to the user documentation for your firewall soft ware Figure 2 7 Unblocking the Recorder software GO Windows Firewall has blocked some features of this program Windows Firewall has blocked some features of Recorder on all public and private networks C vision recorder recorder exe Allow Recorder to communicate on these networks Private networks such as my home or work network networks such as those in airports and coffee shops not recommended use these networks often hav
56. ectrodes that are cur rently being used from a drop down list in the Name column Alternatively you can enter the electrode names by hand gt The Remove Row and Remove All buttons allow you to delete the selected row or all rows respectively gt The Reset Row button allows you to undo the changes made for the channel 74 Chapter 4 Configuring the user settings 4 6 Configuring fast access to the parameters dialog In the Filter Tree Configuration tab you can choose between two ways of configuring fast ac cess to the filter parameter dialog The dialog can be opened automatically whenever you drag and drop a filter icon to the filter tree and or whenever you double click the correspond ing filter node in the tree Figure 4 9 Configuring fast access to the filter parameter dialog m O E Scaling Axes Graph Display Frequency Bands Electrode Positions Fiter Tree Configuration M Configure Quick Access to Filter Parameters J Open Parameter Dialog Automatically on Adding a Filter to the Filter Tree IV Open Parameter Dialog by Double Clicking a Filter Node Chapter 5 Montages Montages enable channels to be reconnected in the software i e new voltage references are assigned to the channels Montages also serve to optimize the display of data e g by com bining frontal electrodes in one montage and occipital electrodes in another one When a montage is selected only those channels which have been a
57. ed and averaged time data 200ms 79ms Segmentation Average Map 79ms 200ms 79ms Ele 79ms 41ms Aims 41ms 162ms n 2 bv 41ms 162ms T 1 eV If you apply the Map filter to frequency data a Map is shown for each frequency band To change the assignment of colors to the frequency bands choose Configuration gt Preferenc es from the menu In the Preferences dialog box selectthe Frequency Bands tab and make the adjustments you require see also Section 4 4 on page 72 In the case of frequency data you can only set the upper limit of the scale in the Scale Min imum uV Hz text box In addition the Extrapolate Edges for Full Map and Show Electrode Positions in Map functions are available see also the description under Continuous time data on page 110 of this section Figure 6 35 Configuring the Map filter for frequency data Display Interval ms Scale Minimum uV Hz Scale Maximum u V Hz Number of Equal Sized Subsegments to Map B IV Extrapolate Edges for Full Map M Show Electrode Positions in Map Frequency data Map 113 114 Chapter 6 Basic filters Figure 6 36 Map filter for frequency data E elp fig_ Spinne_selten ala alal kuss A W Sub Deita MM Delta Theta E Aipha Wi Beta FFT Map Sub Delta
58. ed before it is passed to all the other RecView filters For details on the combina You can replace the master filter at any time e g even after you have created a filter tree It tions of filters that are per is not however possible to use every filter as a master filter The Average filter for example missible in the filter tree refer to section 4 4 on page 55 requires segmented data and can therefore not be applied to raw data Filters that can typically be used to good effect are the MRI artifact filter and the Frequency filter To open the dialog box for selecting a master filter choose Configuration Master Filter from the menu see Figure 3 13 Figure 3 13 Dialog box for selecting the master filter ala AY Em a E a AF NES To configure the master filter click the Parameters button You will find detailed informa tion on the filter specific parameters in Chapter 6 and Chapter 7 Constructing a filter tree 53 3 4 Constructing a filter tree The filter tree permits sequential processing of the data It also provides the possibility of branching It is not always necessary to use a filter tree If for instance you only want to use the MRI For information on select artifact filter you can choose it as the master filter ing a master filter see Section 3 3 on page 52 To open the dialog box for creating a filter tree choose Configuration gt Filter Tree fro
59. electing the software to be installed T Welcome to BrainVision Installation x ud eran PRODUCTS 2 2 p Solutions for neurophysiological research Welcome to BrainVision Installation What would you like to do 4 Install BrainVision Analyzer 2 Product Manuals Install BrainVision Recorder Demo Data Install further Components Browse the CD Register your Product online BRAIN ISION BRAIN ISION BRAIN ISION ANALYZER RECORDER RECVIEW Copyright Brain Products GmbH Zeppelinstrasse 7 82205 Gilching Germany xX d 6 You require Microsoft NET Framework Version 4 0 or later to be able to use RecView If Microsoft NET Framework this runtime environment is not present on your computer click nstall NET 4 on the sec ond page of the dialog see Figure 1 5 Figure 1 5 Installing Microsoft NET Framework Version 4 0 second page of the installation dialog T BrainVision RecView x us 3 BRAIN PRODUCTS Solutions for neurophysiological research G Please choose from the options below Install RecView Software requires NET 4 7 Open om ngish Version Open Manual German Version BRAIN ISION BRAIN ISION BRAIN ISION ANALYZER RECORDER RECVIEW Copyright Brain Products GmbH Zeppelinstrasse 7 82205 Gilching Germany 7 The system asks you if you want to authorize installation of Microsoft NET Framework Version 4 0 Click Yes see Figure 1 6 30 Chapte
60. electrodes In addition the filter can help you achieve a long term reduction in the time required for preparation by allowing you and your personnel to gain experience of the required amounts of gel Once the potential presence of gel bridges has been detected you must decide whether or not to continue with the measurement While you are performing impedance measurement using the actiCAP ControlSoftware or the Recorder you can also run RecView in parallel However if you wish to reliably detect gel bridges the actiCAP ControlSoftware and the Recorder must not be in impedance mode Figure 6 8 Filter tree with Bridge Tool filter and associated parameters dialog box Filter Tree Bridge Tool Parameters Band Power Trigger ae z itivity Fe Medium Cancel Bipolar Montage C Low Bridge Tool Se In the Bridge Tool filter s parameters dialog box you can Set the sensitivity to be used for the detection of gel bridges between two channels If in doubt you should choose Low Of course setting the sensitivity to High increases the probability that gel bridges that are gen uinely present will be detected At the same time however this also increases the probabil ity of false alarms i e gel bridges may be reported even though none actually exist The opposite applies to the setting Low To obtain values that will help you decide on the optimum detection sensitivity more quickly we recommend
61. ements They refer to the main window left hand window Menu Description tebe e Ke a i gt ka Connect to Vision Recorder Disconnect from Vision Increase Interval Decrease Interval Decrease Channels Increase Channels Next Channel Group Previous Channel Group Baseline Correction in Display Reset Averaging Templates establishes the connection to the Recorder interrupts the connection to the Recorder increases the displayed interval alternatively use the keyboard shortcut Ctrl Num decreases the displayed interval alternatively use the keyboard shortcut Ctrl Num increases the scale alternatively use Ctrl arrow up decreases the scale alternatively use Ctrl arrow down decreases the number of channels displayed increases the number of channels displayed switches to the next channel group alterna tively use Ctrl page down This function is only available if you have previously reduced the number of channels switches to the previous channel group alterna tively use Ctrl page up This function is only available if you have previously reduced the number of channels activates or deactivates baseline correction Only the baseline of the display is changed not the data itself used to recalculate the correction templates for MRI artifact correction during filtering This but ton is only available for MRI artifact correction and is only visible when this fil
62. er in reality requires 3000 025 ms to complete a TR cycle In our example this causes the data points of the subsequent TR to be measured 0 025 ms too early Thus the measured values for the artifact in the data points of the subsequent TR no longer exactly match those which are stored in the template This has a negative impact on the quality of correction Because the difference between the true TR of the scanner and the nominal TR of the filter is constant for the whole duration of the measurement each of these drifts adds up and over time the quality of the template is destroyed It is not possible to specify the TR with an accuracy greater than one sampling interval as the algorithm works with data points separated by one sampling interval This means that even if the TRis specified as accurately as possible it is possible for an offset to arise BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 122 Chapter 7 Optional filters The following diagram shows an example of template drift The true TR ofthe scanner is one third of a data point longer than the nominal TR The top part of the diagram shows the times at which data points are measured and how they are assigned to the template The bottom part shows the times at which the artifact repeats in reality The value of the artifact at the time at which the fourth data point of the fourth TR was measured highlighted in the dia gram is actually the value of t
63. erivation F M Band Power Trigger Type Band Power Trigger Purpose Sends signals to parallel port depending on band power Parameters Frequency Band 8 13 Hz Initial lower Threshold 5 Initial upper threshold 15 Sum of band power values is calculated uV7 z To change the parameters of a filter right click the icon for this filter in the filter tree This opens a context menu Choose Parameters from the menu see Figure 3 18 Alternatively you can open the Parameters dialog box when you drag and drop a filter icon to the filter tree and or when you double click the corresponding filter node in the tree You will find information on configuring these options in the description of the user settings see also Section 4 6 on page 74 Constructing a filter tree 57 Figure 3 18 Context menu for filters Context menu for filters M Master Filter lt None gt AE Copy Filter a Level Trigger Linear Derivation Paste A A Delete Loreta Map Rename Expand All Collapse All MRI fiter Pulse artifact Fiter R Peak Segmenta Trigger m Parameters N Invisible when Filtering Di The context menu contains the following functions in addition to Parameters gt You can use Cut to cut a filter from the filter tree gt You can use Copy to copy a filter node You can use Paste to insert the
64. es 2 2 20 na mei Ea Bo ees EE A gt 151 Listiof abbreviations idine E aaa REEN EEEE E E E EA EREE 153 Glossary EEEN E A E ee 155 S bjectindex Sane Rey rae a EE mE ne et Na 157 vii List of figures Chapter 1 Installation 1 1 AutoPlay dialog box for Windows Vista Windows 7 27 1 2 Executing the Autorun file under Windows Vista Windows 7 A 28 1 3 Executing the Autorun file under Windows Vista Windows 7 Windows 8 B 28 1 4 Selecting the software to be installed 29 1 5 Installing Microsoft NET Framework Version 4 0 second page ofthe installation dialog 29 1 6 Confirmation query before installing Microsoft Net Framework Version 4 0 30 1 7 Accepting the Microsoft NET Framework Version 4 0 license agreement 30 1 8 Installing RecView second page of the installation dialog 31 1 9 Error message output if NET Framework Version 4 0 is not present 31 1 10 BrainVision RecView 1 4 2 Setup dialog box 32 1 11 Accepting the RecView license agreement 32 1 12 Selecting the program folder 33 1 13 Security query under Windows 7 and Windows 8 33 Chapter 2 Configuring the software 2 1 RecView license on the supplied USB data medium 35 2 2 Running the license file as administrator under Windows 7 35 2 3 Calling Recorder program information 36 2 4 Displaying sub licenses in the Recorder 36 2 5 Preferences in the Recorder menu 37 2 6 Activating the RDA server in the Recorder 37 2 7 Unblocking the Reco
65. f template drift This value should be 1 if there is no template drift If there is template drift a value greater than 1 can improve the correction quality However because each TR interval is only incorporated in one of these templates a higher value here means that it takes longer until the templates become mean ingful A sensible value is 3 In the Ignore Channels in Correction text box you can specify a comma separated list of channel names which are not to be corrected by the filter You are also able to reduce the sampling rate of the corrected data after the actual scanner artifact correction has taken place in order to increase the speed with which the subsequent nodes in the filter tree can work Downsampling Ratio is the factor by which the sampling rate is reduced For example a value of 20 means that a 5000 Hz signal is converted to a 250 Hz signal MRI filter 125 The reduced sampling rate data is fed through a Butterworth low pass filter in order to re move remaining noise The Filter Frequency and Filter Slope text boxes specify the filter fre quency and the slope of the characteristic curve of the filter Advanced settings which only rarely need to be changed are available if you click the Change button Figure 7 2 Advanced configuration of the MRI artifact filter Advanced settings MRI Artifact Correction Advanced Settings Template Drift Detection Settings Automatically Detect Template Drif
66. fact gradients are lower than the default values 126 Chapter 7 Optional filters We recommend that you al ways use automatic tem plate drift detection and adjust your settings accord ingly Even if the drift is known in advance the auto matic detection facility can be useful in order to com pensate for discrepancies that occur over time Select the Use Constant Template Drift option to deactivate automatic template drift detec tion This only makes sense if drift correction fails on the measured data or if the template drift is known in advance with a high degree of accuracy If automatic template drift detection is deactivated you can specify a constant drift between two consecutive TR sections in the Drift Value of Sampling Interval text box The drift is specified as a percentage negative or positive value of a sampling interval A value of 30 would mean that the nominal TR of the filter is 30 100 of a sampling interval shorter than the actual TR of the scanner If you check the Enable Automatic Template Resets box the filter automatically rebuilds its templates if changes in the artifact cause the correction quality to drop below a particular value You should deactivate this automatic facility if the filter rebuilds its templates when this is not required You can rebuild the templates at any time by clicking the Reset Averag ing Templates RI button in the toolbar The correction quality is determined on the ba
67. filter allows you to define new channels as linear combinations of ex isting channels Alongside manual configuration it is also possible to read the coefficient matrix from a text file RecView also possesses three filters which can directly address your computer s parallel port The Level Trigger filter sends signals to the parallel port as a function of the voltage curves the R Peak Trigger filter is a variation of the Level Trigger filter which sends signals to the parallel port when ECG peaks are detected The Band Power Trigger filter sends signals depending on the characteristics of the frequency spectrum RecView can not only display the impedance values but also possesses an innovative func tion for improving the quality of your EEG recordings The Bridge Tool filter is used to detect gel bridges and assists you to prepare for the acquisition of EEG data using a large number of channels You can daisychain filters and introduce branches to create extensive filter trees thus allow ing you for instance to take the output data from an MRI artifact correction and use it as the input data for an FFT filter Or you can implement the Level Trigger filter after the LORETA filter and use the voltage curve from your virtual ROI channel to control a feedback application as part of a BCI experiment The modular structure of RecView allows you to expand the software to incorporate addition al user defined filters in the same way as you can for
68. filter also allows you to precisely define the period over which averaging is to be per formed You can define a given number of data blocks or a given window length over which the filter is to perform averaging You can also calculate a weighted average value across the window rectify the preceding signal and subtract the current average value from the current block Because RecView is an Online application the average can only ever be drawn for all the seg ments present at the given time As a result the first segment is shown without change Fur ther segments have still not been passed to RecView by the Recorder at this time As soonas the second segment is available to RecView an average is drawn across these two segments etc Figure 6 2 Parameters dialog box for the Average filter r Parameters for Average MV Enable Baseline Correction Interval Relative to Start of Segment Interval Relative to Marker Interval Relative to Marker Based on Time Based on Datapoints Start ms 100 Start Poit 0 Endims o End Point 0 Duration ms f600 0 Points fi V Enable Rectification r Rectification C Absolute Values Squared Absolute Values IV Enable Weighted Averaging Weighted Averaging Window Form Window Length Equal 10 C Triangular Exponential Time Constant 1 000 IV Apply Zero Phase Delay J Subtract Weighted Average from Current Segment ok I Cancer You
69. filter at the required position in the filter tree gt Delete deletes a filter node alternatively you can select the filter you wish to delete and press lt Deb gt Rename renames a filter node alternatively you can select the filter you wish to rename and press lt F2 Use Expand All and Collapse All to expand and collapse all the filter nodes gt Choose Invisible when Filtering if you want to use a filter in the filter tree but do not wish The function Invisible to display the data The names of invisible filters are shown in blue in the filter tree see When Filtering can for ex Figure 3 19 ample be of use if you want ae to use intermediate filters Figure 3 19 Invisible LORETA filter Master Filter lt None gt Average Band Power Bipolar Montage Tri axial i F Segmentation F J lt Bipolar Bridge Tool Montage You must possess administrator privileges in order to use filters with LPT port control Band Using LPT port control Power Trigger Level Trigger and R Peak Trigger 58 Chapter 3 Getting started and handling the program For information on other ways of running the pro gram as administrator re fer to the Windows user documentation Under Windows Vista and Windows 7 you must start RecView in Administrator mode even if you are already logged in as administrator at the computer To run RecView as admin istrator navigate to the RecView pr
70. g Factors see Figure 6 29 LORETA 109 Figure 6 29 Performing individual scaling of the the ROI channels A IV Polarity Positive Down IV Start with Display Baseline Correction On r Time Domain Default Scaling pV fo Default Display Time s fio r Frequency Domain Default Scaling uM fo Default Display Frequency Range Hz 250 Set Individual Scaling Factors In the Individual Scaling Factors dialog box specify the required channel name in Channel Name and the attenuation factor for this virtual channel in Attenuation As shown in the ex ample see Figure 6 30 we recommend that you choose a factor of 0 00001 Figure 6 30 Performing individual scaling of the ROI channels B 110 Chapter 6 Basic filters 6 10 Map Summary The Map filter shows the interpolated voltage distribution over the surface of the head This is done using the electrode positions and the voltages at the individual electrodes You can apply the Map filter to continuous and segmented time data and to frequency data Continuous time data If you apply the Map filter to continuous data a Map is displayed over a defined time interval Enter the interval for which the data points of each channel are averaged before they are used for calculating the Map in the Display Interval ms text box Enter the lower and upper limits of the scale in the Scale Minimum uV and Scale Maximum uV text boxes The Number
71. ge filter 85 6 7 Bipolar Montage filter 86 6 8 Filter tree with Bridge Tool filter and associated parameters dialog box 87 List of figures xi xii List of figures 6 18 6 19 6 20 6 21 6 22 6 23 6 24 6 25 6 26 6 27 6 28 6 29 6 30 6 31 6 32 6 33 6 34 6 35 6 36 6 37 Displaying gel bridges in the Paired Channel View 89 Parameters dialog box for the FFT filter 91 FFT in the frequency graph view using individual channel mode 92 FFT in the map view 93 FFT filter without overlap left and with overlap right 93 Parameters dialog box for the Frequency filter 94 Frequency filter 95 Parameters dialog box for the Level Trigger filter 96 Level Trigger filter 99 Generating the new channel from the combination of the input channels Fp1 and Fp2 100 Parameters dialog box for the Linear Derivation filter 101 Generating new channels using the Linear Derivation filter 102 Parameters dialog box for the LORETA filter 103 Creating an ROI 103 Adding lobes 104 Adding a specific position 105 Adding a block 105 Part of the LORETA filter dialog box containing a list of the components of the ROI Frontal 106 Display of the mouse pointer in the cross section and the information field 107 Virtual channels Frontal and Frontal_2 108 Performing individual scaling of the the ROI channels A 109 Performing individual scaling of the ROI channels B 109 Configuring the Map filter for contin
72. gram folder This must be referenced in all filter projects You will find a precise description of the structure of the interfaces classes and attributes in the help file RecView nterfaces chm located in the subfolder Filter Development For notes on debugging user defined filters using Visual Studio 2010 Express C see the file Debugging RecView Filters with Visual Studio 2010 Express Edition C pdf in the Filter De velopment subfolder BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 134 Chapter 8 Programming user defined filters 82 Interfaces The following interfaces can or must be implemented IDataln mandatory This interface is mandatory It receives the data setup information and status information from the previous filter IDataOut optional If the results of the filter are to be passed to RecView so that they can be viewed or distribut ed to further filters you must implement this interface It establishes the connection be tween the filter and another IDataln interface supplied by RecView IFilterParameters optional This interface allows you to enter parameters Parameters are stored in text format in the workspace file by RecView The interface receives or supplies the text and displays a user di alog box on request ISimpleView optional This interface is used for simple visualization of data The data is displayed in a window out side the RecView frame using the method
73. gs BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 68 Chapter4 Configuring the user settings gt The Polarity Positive Down function defines the polarity of the displayed signal If you select the check box the axis for positive measured values points down gt Ifyou select the Start with Display Baseline Correction On check box the baseline cor rection function in the data view is activated by default Default Scaling uV specifies the default scaling used when data is first displayed You can enter the values for data from the time domain and the frequency domain inde pendently of each other gt Default Display Time s specifies the interval represented in the time domain in seconds Default Display Frequency Range Hz specifies the interval represented in the frequency domain in hertz The frequency domain always starts at O Hertz Individual scaling is desir gt The Set Individual Scaling Factors function allows you to specify the channels that are to able for ECG channels for be displayed attenuated In the table enter the channel names and the associated scal example since otherwise they encroach badly on the curves of the EEG channels ing factors by which you want to reduce the scale of the signals see Figure 4 3 The attenuation only af Figure 4 3 Scaling selected channels fects the display of the da _ n ta it does not affect the Individual Scaling Facto
74. hat reduces the amplitude of high frequency digitized signals Impedance measurement Recorder operating mode for measuring the resistance of the electrodes Impedance Resistance between the electrode and the head skin Interval A section of the EEG signal defined by its starting point and length or by its starting point and end point within the signal L Low cutoff filter Filter that reduces the amplitude of low fre quency digitized signals LPT port see Parallel port M Marker Markers indicate a point in time or a period within the EEG A marker can be an item of stimulus information that is used to ascertain evoked potential It can also mark a new segment or indicate that a DC offset correction was car ried out at a certain time Markers are used for orientation during segmentation Monitoring Observation of the EEG signals on screen Montage Reconnection of the channels in the software whereby new voltage references are assigned to the chan nels 156 Glossary P Polarity The polarity setting determines whether the axis for positive measurements points up or down on EEG curves R Raw file The EEG file obtained directly during recording without any modifications RDA remote data access Remote access to the Recorder or the transfer of data from the Recorder to RecView In this pro cess the Recorder acts as the server and RecView as a client Resolution Specifies the granularity with which
75. he Export Blank ROIs File button exports voxel data including the anatomical data in a CSV file You can open this file in Excel for example define the ROIs manually and reimport them as a CSV file If you edit this CSV file it is essential to make sure that you do not change the number or se quence of the rows in the table Otherwise errors may occur when you import the file again The values in CSV files are separated by commas and not as in earlier versions of the trans form by semicolons Please note this when exchanging data with other programs and when reading older CSV files You can navigate in the cross sections or layers of the tomography either by using the mouse to move the four yellow sliders on the borders of the cross sections in the desired direction or by clicking a point in the cross section and using the mouse wheel to scroll up and down When you click in a cross section the position of the sliders is updated LORETA 107 An information field is displayed below the 3D anatomies This refers to the position of the mouse and contains the following information in the following sequence see Figure 6 27 gt The parentheses contain the cross section coordinates of the current position of the mouse pointer crosshair When you move the mouse pointer around the cross section the coordinates displayed change accordingly gt The value for Best Match at specifies the distance from the current mouse position of the nex
76. he artifact at the time at which the third data point of the first TR was measured If this data point is included in the templates without compensating for the template drift this results in a discrepancy Gemessene Datenpunkte aus Sicht des Filters Zuordnung der Datenpunkte zum Template der L nge TR l Die wahre TR des Artefakts ist um einen Drittel Datenpunkt l nger The MRI artifact filter is able to determine the template drift and also calculate which point of the template a measured data point should be assigned to If the template drift exceeds the value of one sampling interval then the start of the artifact is shifted by one or more data points However interference still occurs because some TR sections are offset by a fraction of the sampling interval with respect to the template The diagram shows how the filter compensates for the template drift in the fourth TR by shift ing the template in relation to the measured data points Gemessene Datenpunkte aus Sicht des Filters Be HE VE DE DE BEE TE EN Ee ee ee ee N KG I Zuordnung der Datenpunkte zum Template der L nge TR I larilirilirillatiliriliia I I Fa Pa DER a UT ea ye et RR GE DR 0 DD gS De GR Die wahre TR des Artefakts ist um einen Drittel Datenpunkt l nger In order to improve the quality of the correction still further the filter actually uses several templates The template drift of the first point is determined for every section
77. hibit additional TTL Pulses for box and specify the required inhibition period in the n hibition Period ms text box Events that are detected during the inhibition period do not trigger any additional TTL pulses If you enter identical values in the nhibition Period ms and TTL Pulse Length ms text box es this prevents triggers from ever being overwritten By choosing an inhibition period that is longer than the value specified in TTL Pulse Length ms then you can prevent TTL pulses from occurring more frequently than you would want If you select the Hysteresis option then continuous TTL signals are sent as triggers to the LPT port In the table you can now only fully access the Threshold Value Exceeded row i e it is only possible to configure a TTL signal for the Threshold event When the signal is sent to the LPT port the LPT port status is retained until it is reset to the value O in response to the oc currence of the Reset event You can also set a marker for each of Threshold Value Exceeded Peak Found and Reset Val ue Under Run by checking the corresponding box in the Set Marker column Please note that the Peak marker is set at the time when the peak is recognized as such In the data it there fore appears offset from the real peak by the value specified in Time Tolerance Level Trigger 99 Figure 6 17 Level Trigger filter tage Configuration Window Help an RFR fig Blume_hau e_selten_zahlen Spin
78. idge Tool filter This procedure is also useful if you want to use the Bridge Tool filter to train your personnel in cap preparation 1 Fill6 to 10 neighboring electrodes with gel and optimize the impedances electrode LEDs glow green When doing this use as little gel as possible 2 Use the Bridge Tool filter to perform regular checks of this group of neighboring elec trodes for the presence of bridges during the preparation procedure To do this switch the Recorder software between impedance 4 land monitoring mode 3 Ifyou detect a large number of gel bridges during the preparation stage you must decide whether to interrupt or continue the measurement 90 Chapter 6 Basic filters Requirements relating to the test subject Practical experience concern ing the number of electrodes Related publications 4 When you have finished preparing all the electrodes apply the Bridge Tool filter again in order to obtain definitive information about the possibility of gel bridge formation If you already have a lot of experience of preparing electrode caps we recommend that you proceed as follows when using the Bridge Tool filter in order to minimize the time spent pre paring the electrodes 1 Useas little gel as possible and attempt to obtain good average values for the impedanc es of all electrodes electrode LEDs glow yellow 2 When all the LEDs are glowing yellow or better apply the Bridge Tool filter The probabil ity of gel
79. iew nterfaces dll in the project since it could reference an invalid folder Do this by deleting the reference and then creating it again specifying the correct path As we have already said the file is located in the RecView pro gram folder The job of this filter is to allow a channel selected by the user to be deactivated i e all the values on the channel are set to 0 Here we shall look at the file TestFilter cs containing the class TestFilter The class contains one filter attribute Without this attribute RecView would ignore the class The first element of the attribute id is a GUID This is a 128 bit value which uniquely iden tifies the filter If RecView finds several filters with the same GUID only the first of these is loaded You should therefore generate a genuine GUID in Visual Studio for instance by choosing Tools Create Guid The displayName parameter defines the text which appears in menus etc Description is a short help text The next four parameters describe which input and output data types and which segmenta tion types are permitted In our example we have the type DataTypes TimeDomain for both input and output data type This means that the filter expects and returns data from the time domain The permitted input segmentation types are described by Segmentation Types Continuous SegmentationTypes Segmented This means that the filter can use both continuous and segmented data The output segmentation type
80. ifferent parameter configurations D 1 Diagrammatic representation of the behavior of TTL pulses 149 Legal notes List of figures xiii xiv List of figures List of Tables Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Appendix A Appendix B Appendix C Appendix D Appendix E Installation Configuring the software Getting started and handling the program 3 1 Combinations in the filtertree 55 Configuring the user settings Montages Basic filters 6 1 Structure ofthe channel matrixthatisto bereadin 101 Optional filters Programming user defined filters Electrode coordinate system Installing the RecView license from the Brain Products web site How can I find the address of the LPT port Behavior of TTL pulses in different parameter configurations Legal notes BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 XV xvi List of Tables About this manual This User Manual describes the ExG visualization software BrainVision RecView Version 1 4 3 It is part of the software product It is essential to follow the instructions in the manual in order to use the software correctly and as intended The structure of the manual The User Manual has 8 chapters gt Chapter 1 contains a description of the individual installation steps gt Chapter 2 contains instructions on how to configure RecView and the BrainVision Re
81. imple biofeedback filter can be implemented using a combination of IDataIn and ISimpleView You will find an example of this on the BrainVision program DVD in the folder Filter Development Samples SimpleViewExampleFilter below the RecView folder You can also develop a filter which only implements IDataIn The data can then for in stance be exported over the serial interface You could also write the data to hard disk Interfaces 135 136 Chapter 8 Programming user defined filters If you want to use the exam ples in debug mode you will findtherelevant information in the file Debugging RecView Filters with Visu al Studio 2010 Express Edition C pdf in the Filter Development subfolder on the BrainVision program DVD 8 3 Programming examples The sample projects are located in the RecView Filter Development Samples folder on the BrainVision program DVD Compiled versions of the projects are located on the DVD in the folder RecView Filter Devel opment Samples Binaries If you wish to test these projects copy them to the program fold er Sample filter 1 We shall look at the filter in the subfolder RecView Filter Development Samples FlatChan nelFilter in detail below While you are reading the following explanations you should have the help file Recorderinterfaces chm open It is usually possible to compile the project without difficulty using Microsoft Visual Studio 2010 You may have to adjust the reference to RecV
82. intervals for the subdivisions of the axis To change the settings for the arrangement interval and labeling click Change The Axis Tick Configuration dialog box opens see Figure 4 5 70 Chapter 4 Configuring the user settings Figure 4 5 Configuring the subdivisions of the axis tickmarks r Axis Tick Configuration moo Tickmarks Set Automatic C Set Manual Tickmark Spacing 1 IV Auto Tickmark Length Tickmark Length 2 Tickmark Labels IV Show Labels Label Spacing ff ts IV Auto Label Tick Length Label Tick Length 4 OK Cancel You can make the following settings in the Axis Tick Configuration dialog box gt You can either have the intervals calculated automatically Set Automatic option or set them manually Set Manual option Enter the axis subdivision interval in the Tickmark Spacing text box and the length of the tickmark in the Tickmark Length text box If you check the Auto Tickmark Length box the length of the tickmark is determined au tomatically The Show Labels check box is used to specify whether the subdivisions of the axis are labeled and if so at what intervals Label Spacing text box This specification deter mines the number of tickmarks after which a label is displayed The Label Tick Length text box is used to specify the length of the labeled tickmarks If you check the Auto Label Tick Length box this length is determined automatically 4 3 Graph d
83. is away from the center of the coordinate system It is stated in millimeters The only exceptions are r 0 and r 1 r 0 signifies an invalid po sition for instance when the position of an electrode is not known r 1 means that a stan dard diameter has been chosen for the radius This can be used when the surface of the head is approximated by the surface of a sphere specifies the angle between the x axis and the projection of the line connecting the point and the coordinate origin on the xy plane gt 0 applies to the front right and rear left quarter of the sphere and lt 0 to the front left and rear right 0 is the angle between the z axis and the line connecting the point and coordinate origin In the left hemisphere lt 0 In the right hemisphere 8 gt 0 BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 140 Appendix A Electrode coordinate system Figure A 1 Coordinate system for electrodes Z 141 Appendix B Installing the RecView license from the Brain Products web site RecView can only be used if you have purchased a sub license for the Recorder If you pur chased sub licenses at the same time as you purchased the Recorder the sub license file is included on a USB data carrier supplied with the software All sub licenses that you have pur chased can be downloaded from the Brain Products web site Appendix C describes how to download and install sub licenses that y
84. isplay The Graph Display tab is used to configure how graphs are displayed Figure 4 6 Configuring how graphs are displayed es Scaling Axes i i Frequency Bands Electrode Positions Fiter Tree Configuration Time Domain Draw Data as Graph C Draw Data as Block r Frequency Domain _ Draw Data as Graph Draw Data as Block IV Draw Fill Colors You can make the following settings gt The Draw Data as Graph and Draw Data as Block options allow you to specify whether the individual data points are to be drawn as a graph or as discrete blocks You can make this setting separately forthe time domain and the frequency domain gt Forthe frequency domain only the Draw Fill Colors option allows you to specify whether the area under the graph is filled with colors If you choose to do so the frequency bands set on the Bands tab are highlighted in color see Section 4 4 as of page 72 Graph display 71 72 Chapter 4 Configuring the user settings 4 4 Representation of the frequency bands The Frequency Bands tab allows you to define frequency bands and assign colors to them This is used when representing frequency data e g FFT Figure 4 7 Defining frequency bands Scaling Axes Graph Display Frequency Bands Electrode Positions Fiter Tree Configuration Begin Hz End Hz You can make the following settings gt Inthe table you can specify the co
85. lculate a weighted average of the data blocks check the Enable Weighted Averaging box Enter the number of preceding i e past data blocks that are to be included in averaging in the Window Length text box You can choose between three window functions gt Equal The Equal option generates a symmetrical rectangular window All the data blocks are weighted equally gt Triangular The Triangular option generates a symmetrical triangular window As a re sult at half the window length Window Length box the centrally located data block will have the greatest weighting gt Exponential The Exponential option generates a non symmetrical window which falls ex ponentially on one side The value of the time constant is required for a complete defini tion of this window that falls exponentially on one side It comprises the same number of blocks as is specified in Time Constant Average 79 80 Chapter 6 Basic filters By checking the Apply Zero Phase Delay box you are able to delay data output from the filter by half the window length i e the filter supplies the averaged data to the view with a lapse of half a window length Please note that in this case you must always select an even number for the window length since this is the only way of defining an unambiguous midpoint in the window If you want to depict current deviations from the long term average value check the Subtract Weighted Average from Current Segment box This subtrac
86. ll 38 frequency band 81 assigning a color 72 configuring 72 113 frequency data 72 78 81 110 113 114 137 frequency graph 91 G gradient 121 123 125 126 graph configuring 71 H Hamming window 92 Hanning window 92 high cutoff filter 94 ICA component 102 ICA matrix 102 impedance view 50 individual channel mode 49 92 158 Subject index inhibition period 82 83 98 147 148 installation conditions see also system requirements 25 Windows Vista Windows 7 27 Windows XP 26 K keyboard shortcut 44 45 60 L license 25 downloading 141 installing 35 36 142 low cutoff filter 94 LPT port controlling 45 57 81 82 83 96 98 115 116 137 identifyingthe address 145 programming example 138 specifyingthe address 40 45 status display 137 138 trigger 81 96 115 M Map 92 110 for segmented data 111 marker displaying 47 forcomments 84 forpeak 98 for R peak 116 128 131 hiding 130 segmentingon 118 setting 96 97 115 masterfilter 45 selecting 52 menu bar 43 Microsoft NET Framework 29 30 133 montage keyboard shortcuts 76 showing 43 45 75 switching between 76 MR data 121 MR scanner 22 115 121 neurofeedback 81 96 notch filter 94 O overlapping 91 93 119 P polarity 116 power density 79 82 92 program starting 39 status 45 program folder 32 58 133 136 program information displaying 43 programming interfaces 134 RecViewlnterfaces dll 133 136 138 sample filter
87. lly Segmentation Average nt Count 140 1 Segmentation 2 Segmentation Average At the top right of the RecView interface is a toolbar that applies to the currently active filter window The functions and keyboard shortcuts corresponding to these buttons are the same as those of the main toolbar However note that you have to press the key combination lt Ctrl Shift rather than just the lt Ctrl gt key to use the keyboard shortcuts Ifthe error message Window too small for display appears enlarge the relevant filter window with the mouse until the data is displayed correctly see Figure 3 24 Constructing a filter tree 61 Figure 3 24 Enlarging the data window to show the data correctly Window too small for display 62 Chapter 3 Getting started and handling the program 3 5 The workspace concept The filter tree you create is saved in a workspace When RecView is first installed a new work space is automatically created with the name Standard Workspace Any changes you make to the filter tree are always saved in the current workspace If you want to define different filter trees you must set up new workspaces 1 Todo this choose File gt New Workspace from the menu see Figure 3 25 2 The Save As dialog box appears 3 Entera meaningful name for the workspace in the File name text box 4 Click Save when you have completed your entries see Figure 3 26 Figure 3 25 Creating a new workspace
88. lor of a band its name and where it starts and ends in which columns from left to right in hertz You change the color for the band by clicking on a color swatch in the Color column This opens the color selection dialog box gt Toextend the table click in an empty row and fill in a cell Anew row is then automatically added to the table gt The Remove Row and Remove All buttons allow you to delete the selected row or all rows respectively gt The Defaults button allows you to reset all the values modified in the table to their initial configuration Adjusting the electrode positions 73 4 5 Adjusting the electrode positions RecView uses the 10 10 coordinate system for calculations which depend on the electrode amp You will find a description positions such as the map If the names or positions you use differ from this system you of the electrode coordinate can specify them in the Electrode Positions tab system IN Appendix Aaso page 139 Figure 4 8 Selecting the electrode positions Mei E Scaling Axes Graph Display Frequency Bands Electrode Positions Fiter Tree Configuration Name Radius Theta Deg Phi Deg Res F3 1 60 51 Rem Fz 1 45 90 69 21 Ren You can make the following settings gt Once you have established a connection between RecView and the Recorder by means of Connect to Vision Recorder 9 you can select the names of the el
89. lter So mes elx ala Al I jslwlal Segment Count 2 i Fp1 T Fp2 i AF3 AF1 AFz AF2 AF4 H F7 l F5 J F3 ps ee EEE WERNER BRIEF a F2 F4 ag Sas Se SS Ty Se ag ee ee ol The number specified in Segment Count in the top left of the filter window specifies what segment is currently being displayed The Time Zero marker dashed horizontal line is also displayed Figure 6 42 Display of the segment number and the Time Zero marker Segment Count 8 ep st m nn wine Fp2 a a man AF3 wm wel AFA 1 A segment that is detected is displayed until the next segment can be displayed in its entire ty This means that only the current segment is ever displayed e Segmentation 119 Note that in contrast to the Analyzer the values for the time based text boxes are not automatically convert ed to the corresponding number of data points or time points if you change the specification method 120 Chapter 6 Basic filters 121 Chapter 7 Optional filters 71 MRI filter If EEG data is recorded in an MR scanner the signals are subject to considerable interfer Summary ence In this context we distinguish between two primary categories of artifacts 1 Scanner artifact A scanner artifact is caused by the alternating magnetic field during the scanning process 2 Cardioballistic artifact A cardioballistic artifac
90. ly e 35 pter 2 Configuring the software 2 1 Installing the RecView license Install the license for RecView on the computer on which you are running the Recorder The license file is on the USB data medium accompanying the BrainVision program DVD see Alternatively you can obtain i the most recent license file Figure 2 1 FE from the Brain Products Web site For detailed informa tion refer to Appendix Bas of page 141 Figure 2 1 RecView license on the supplied USB data medium LS La o gt Im gt Com Removable v Search Removable Disk D P Organize Share with w Burn New folder i 91 1 z Ft Favorites Paine Type E BrainProducts License 20130115 1110 exe Application 3 Libraries A Computer amp Windows7_0S C m Removable Disk D 1 item Proceed as follows 1 Unpack the ZIP file BrainProducts License xxxxxxxx xxxx Zip 2 Run the EXE file BrainProducts License xxxxxxxx xxxx exe by double clicking it Follow the instructions from the installation program On systems running Windows Vista Windows 7 always run the file by right clicking it and choosing Run as administrator see Figure 2 2 Figure 2 2 Running the license file as administrator under Windows 7 S 2 es o gt es gt Com Removable w 4 Search Removable Disk D 2 Organize v Share with v Burn New folder
91. m the menu The Filter Tree dialog box is divided into two main windows see Figure 3 14 The left hand window contains the filters installed in RecView The filters are represented us ing different colored icons The right hand pane contains the current filter tree starting at the root Figure 3 14 Empty filter tree Master Filter lt None gt Average Band Power Trigger F Bipolar Bridge Tool Montage FFT Frequency Filter u Level Trigger Linear Derivation Master Filter lt None gt Type This is the master filter node Purpose The master filter settings are available in the master filter dialog Parameters m 54 Chapter 3 Getting started and handling the program You create afiltertree by dragging filters from the left hand window and droppingthem in the right hand window You can also attach filters to the branches filter icons in the filter tree and thus add subnodes to the main filter nodes see Figure 3 15 Figure 3 15 Adding subnodes to main filter nodes by means of drag and drop Filter a Level Tigger Linear Derivation Loreta Map MRI Filter Pulse artifact Filter m Purnnes Eihar that sanmante dats sraund salantad marbars Certain filters can only handle specific input data This means that certain combinations of filters are not possible for more information see Table 3 1 on page
92. med at the EEG data File name extension rvwksp Subject index A actiCAP ControlSoftware 87 Administratormode 58 81 96 115 138 Analyzer 25 75 92 100 102 118 119 artifact see also scanner artifact and cardioballistic artifact 88 92 averaging 78 pulse artifact correction 128 scanner artifact correction 121 weighted 79 axes configuring 69 subdivisions 70 bandwidth 94 baseline correction 44 68 79 block indicator 45 Butterworth high cutoff filter 125 c cardioballistic artifact 121 correcting 127 131 channel activating deactivating 50 creating 85 100 100 102 reconnecting 85 coefficient matrix 100 101 Command line options 64 coordinate system for electrodes 139 for voxels 104 D data loss 45 data representation configuring 44 incorrect 60 61 simultaneous 49 downsampling 127 130 131 E ECG 116 channel 68 117 127 data 115 electrode BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 157 changing position 73 111 coordinate system 139 detecting gel bridges 87 preparing 89 90 F FFT Fast Fourier Transform 91 data window 92 filter tree 53 creating 53 54 displaying 58 editing 57 filter windows arranging 43 60 switching between 45 filters combining 54 55 configuring 56 configuring parameter dialog access 74 invalid combinations 54 invisible 57 parameters 56 programming see also programming 133 renaming 57 valid combinations 55 firewa
93. n Afterthe training phase has been completed the actual pulse detection process starts This involves a combined procedure using correlation and amplitude criteria that compares the period ofthe pulse pattern with the current period Ifthe correlation lies above a previously defined limit and the amplitude lies within previously defined limits an R peak marker is set at the position on the time axis at which the R peak was set in the pulse pattern Correction The pulse artifacts are corrected simultaneously on all EEG channels that you have not ex cluded from correction During this process a period defined by entering a time prior to the R peak and a time after the R peak is corrected In order to correct this period a template is used which is derived by averaging the previous pulse periods and then selecting this value from the current data period Figure 7 4 Parameters dialog box for the Pulse artifact filter Settings f Pulse artifact Filter Parameters Detection Parameters Correction Parameters Pulse Reference Channel era Number Pulses in Average 0 DD Look for a Model Pulse s 5 2 Correction before Peak ms foo Minimal Pulse Period ms 750 Correction after Peak ms ji IV Mark Pulse Peaks Excluded from Correction Oo Minimal Correlation fs Minimal Amplitude 02 7 Downsampling before Correction Mama Amplitude hs IV Do Downsampling Suppress Marker Display V Hide Markers with Description
94. n ichtzahlen 7 Level Trigger 0378 e seeeuae Standard Workspace 100 Chapter 6 Basic filters Summary Linear Derivation filter in RecView compared to the Linear Derivation trans form in the Analyzer 6 8 Linear Derivation The Linear Derivation filter allows you to generate new channels through linear combinations of existing channels The new channels are calculated from coefficients that are assigned to existing channels based on the following formula New channel coeff1 channel1 coeff2 channel2 Unlike the operation of the Analyzer s Linear Derivation transform RecView does not know the input channels that are present in the data set at the time of parameter entry If you do not read the coefficient matrix from a file you must therefore enter the channel names man ually Here you should note that you do not need to enter all the input channels but only those that you require for the generation of the new channels that you wish to create For example if in a data set you want to generate a new channel as the sum of the input channels 0 3 Fp1 and 0 33 Fp2 then the specifications entered in Figure 6 18 are sufficient even if the input data contains further channels Figure 6 18 Generating the new channel from the combination of the input channels Fp1 and Fp2 N e w h a n n e I s Figure 6 19 Parameters dialog box for the Linear Derivation filter Number of New Channels
95. n in front of every channel see Figure 3 5 Figure 3 4 Scaling bar at the end of the channel list a NM Figure 3 5 Scaling bar display in front of each channel Beneath the channel list separated by a gray line the program displays any markers present in the EEG see Figure 3 6 48 Chapter 3 Getting started and handling the program Figure 3 6 Markers displayed T f wr wy TP9 IT MT N ENT oe N open eyes closed eyes Monitoring Standard Montage Blocks Ok Standard Workspace Pulse artifact Filter 3 2 Performing a simple session Proceed as follows to test the basic functionalities of RecView b Once it has been successfully installed and configured start the Recorder 2 Start RecView 3 In the RecView toolbar click Connect to Vision Recorder 9 This establishes the con nection between the Recorder and RecView Ifthe Recorder is not available the message Waiting for Recorder appears in RecView 4 Start the Recorder in monitoring mode by clicking the Monitor button see Figure 3 n 5 RecView now also displays the data sent by the Recorder see Figure 3 8 Figure 3 7 Starting data viewing recording in the Recorder File View Display Montage Configuration Window Help Figure 3 8 Simultaneous data view in the Recorder and RecView Recorder You can select individual chan
96. ndows To reactivate the channel repeat the pro cess and click the relevant menu item to remove the tick in front of the command Figure 3 10 Global deactivation of a channel Switch off VEOG Locally Switch off VEOG Globally Standard Montage Originall rechte Hand Monitoring Standard Montage Blocks Standard Workspace lt None gt Figure 3 11 The VEOG channel has been deactivated globally and the HEOG channel locally i 200 pV If you switch the Recorder to impedance mode RecView also displays the impedances of the electrodes see Figure 3 12 Figure 3 12 Impedance mode in the Recorder and impedance view in RecView Recorder File View Display Montage Configuration Window Help efi wl ul a of alal la 7118 il alms ell r Electrodes Data Reference C Ground BrainVision RecView WW File Display Montage Configuration Window Help Impedance Check Performing a simple session 51 52 Chapter 3 Getting started and handling the program 3 3 Selecting a master filter amp To make the following settings disconnect RecView from the Recorder To do this click Dis connect from Vision Recorder in the RecView toolbar If you wish you can select a master filter The master filter is used to filter the raw data sent by the Recorder before it is displayed in the main RecView window The data is also pre fil ter
97. ne Tat E E R E E EE ai 64 BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 vi Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Configuring the user settings c cc csescesssssescesceccsscsseescssessesessessessesscsseeeeeseeceeseesssesessseseesaesasenees 67 4 1 GCONTISUTING THE scaling see a a e E A shes das Sab T EE edhe tee abesbeaten dense 67 4 2 Configuting th amp ax65 niet db E A EN ne rinnen 69 4 3 Graphdisplayns sus a a e r E a ae e isses ouedidevnettonsesty 71 4 4 Representation of the frequency bands eeessenssnnnnnnnnennnnnnssnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnsnssnssnnnnnnnnnnn 72 4 5 Adjusting the electrode positions eeeeseessssessensennnnnnnnnnnnnnnnnsssnnnnnnnnnnnnnnnnnnnnnnnnnssssssssssnnnnnnnnnnnnnnn 73 4 6 Configuring fast access to the parameters dialog sessssssessseessssssssssssssssereeeeeeessssssssssssereseeeeeesese 74 Mont SES conien irteerei N T E SAE E a A 75 Basic Filters oi A ENA E a 77 6 1 PAV ETS E RN ETETEN ATE A E A E E OE OE E E R TAE 78 6 2 Band Power Trigger eena a A A E ER E A I E TaI 81 6 3 Bipolar Montag ein aea Ru RoE ee EN EEE AEE E EEEE 85 6 4 BrIdSE Tool a A A A E EEE NSA OA EO AOA EEE E NIESSEN TETN 87 6 5 FFT East Fourier aS O a sd sdosuvczesndeecdoveseeveces a e E A a 91 6 6 Frequency A a a I EE E A E EE A E 94 6 7 ES TIS SO RATE A E EEEE 96 6 8 Linear Derfivation zaseesieseiiiinirhesengntisinlsbueels leute errang 100 6 9 LORETA
98. ned filters Sample filter 3 The final example ExampleParallelPortAccess illustrates how the parallel port can be controlled using a filter which you define yourself Your filter does not need to implement any interface in order to control the parallel port Instead you simply need to use the methods of the class ParPortAccess which is present in the file RecView nterfaces dll Use the public methods bool Init InfoProvider info out string sMessage ParportAccess Write byte signal and byte ParPortAccess Read as described in the example Note the use of a constructor with Infoprovider Delegate as parameter If you want to make use of the possibility of monitoring the operation of your filter in the RecView LPT port status display add the entry HWAccess LPTPort to your filter attributes as in the exam ple Please note that you need administrator permissions in order to use this type of filter 139 Appendix A Electrode coordinate system The electrode coordinate system used in RecView is explained below This coordinate system is used wherever electrode positions are needed e g in mapping The axis system is defined in such a way that the z axis runs through the vertex The x axis points to the right and the y axis to the front Spherical coordinates are used to specify a point on the head A set of coordinates consists of the three variables r 0 and radius theta and phi The radius r specifies how far the point
99. nel mode see Figure 3 9 by double clicking the name ofthe required channel Double clicking on this view in turn switches back to the overall view Figure 3 9 Individual channel mode Ekgi 2 mV File View Display Montage Configuration Window Help tw ul of alal Malalai 71 1 FPA mn nn nn Fp2 m Ten F3 Spee Tot F4 Te c3 un ca E BrainVision RecView P3 net File Display Montage Configuration Window Help pa u x ala l I jElwlafr 01 I ji Ik F7 ee ket Fe Ne nn Fp2 aii I VT 7 ated F3 1 T8 un Tr F4 N i i ri Pr a ride i i r Ps mn ca Fz P3 N Cz P4 Pz m 01 FC1 02 C ai i had h Fc2 F7 mul crt m Fe roan cP2 7 FCS m Te FCS P7 cps wu Ps oy cpe Fz I vun cz TP10 rt ver Pz Eog Fc1 Ekgt AY Fc2 Be crs cp2 FCS Performing a simple session 49 Individual channel mode 50 Chapter 3 Getting started and handling the program Activating deactivating chan nels It may for instance be sen sible to deactivate chan nels if heavy interference on one channel hides other channels Impedance view To deactivate a channel and thus suppress the signal received right click the corresponding channel name This opens a context menu Choose Switch Off channel name Locally to de activate the channel in the active data window Choose Switch Off channel name Globally to deactivate the channel in all open data wi
100. nty system 10 20 system Internationally recog nized standardized method for positioning electrodes on the head The skull is measured from defined anatomical points The distance between neighboring electrodes is ei ther 10 or 20 of the measured distances Trigger Pulse generated by a device or software program and which initiates an operation A presentation software package can for example generate a trigger each time an image appears The trigger can be sent to the amplifier via the parallel port of the computer and recorded by the Re corder as a marker simultaneously with the EEG EEG activity e g an EEG signal of sufficient amplitude or length can also be used to generate a trigger pulse that starts a process e g control of a program TTL pulse Transmission to the LPT port of a trigger signal which is reset to the value 0 after a relatively short period TTL signal Transmission to the LPT port of a trigger signal which persists though to the reception of a given reset event at the LPT port when the reset event is received the value is reset to 0 V View Method of representing the EEG such as the grid view the head view and the mapping view A view determines how the channels are arranged in the window for example W Workfile A file containing information on workspaces rvwksp montages mont and other user defined set tings Workspace Storage location for files the processing steps perfor
101. nuous Level Trigger Time domain Time domain Continuous Continuous Linear Time domain Same as input Continuous Corresponds to Derivation frequency data type segmented input segmenta domain com tion type plex LORETA Time domain Time domain Continuous Corresponds to segmented input segmenta tion type Map Time domain Same as input Continuous Corresponds to frequency data type segmented input segmenta domain com tion type plex R Peak Trigger Time domain Time domain Continuous Continuous Segmentation Time domain Time domain Continuous Segmented MRI Filter Time domain Time domain Continuous Continuous Pulse artifact Time domain Time domain Continuous Continuous The Filter Tree dialog box contains details on the currently selected filter below the two main windows These details include the filter name the filter type a brief description of the filter and the filter specific parameters that have been set see Figure 3 17 Constructing a filter tree 55 Combinations in the filter tree 56 Chapter 3 Getting started and handling the program You will find detailed infor mation on the filter specif ic parameters in Chapter 6 and Chapter 7 Figure 3 17 Details on the currently selected filter Filter Tree Average Band Power Master Filter lt None Er Band Power Trigger Trigger Ho Bipolar Bridge Tool 5 Montage FFT Frequency Filter a Level Trigger Linear D
102. ocated at the top ofthe RecView window Figure 3 1 Menu bar and toolbar Tee Bern Fee File Display Montage Configuration Window Help lt x ala A E va Fpi Aal 100 pv Fp2 100 pv 100 pv F4 we 100 pv c2 AAN 100 pV c4 wu 100 pV Reaction Frequent Frequent nt Frequent Frequent Reaction Frequent Monitoring Standard Montage Blocks Ok 2131AAB_HC lt None gt The individual menus have the following functions Menu bar Menu Description File is used to set up edit and save a workspace Display Montage is used to display the montages Configuration is used to make default settings for the locations used to archive and store the work files and the data and to configure the filters and user settings Window is used to organize the data windows Help is used to display program information and the installed compo nents and to open this User Manual The main toolbar is located below the menu bar and allows you to make a number of different Toolbar settings including the displayed interval and the number of channels displayed simultane ously BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 44 Chapter 3 Getting started and handling the program The labels for the elements in the main toolbar are displayed when you position the mouse pointerovereach element Atooltip appears aftera few moments The main toolbar contains the following el
103. of Equal Sized Subsegments to Map text box is not enabled if you apply the Map filter to continuous time data Figure 6 31 Configuring the Map filter for continuous time data Master Filter lt None gt Linear Derivation F Map F Map Parameters Loreta Mapping Display Interval ms Scale Minimum pV Scale Maximum pV Number of Equal Sized Subsegments to Map IV Extrapolate Edges for Full Map IV Show Electrode Positions in Map Parameters If you check the Extrapolate Edges for Full Map box all the electrodes present in the visible portion of the sphere are shown The data required for this representation is extrapolated If you check the Show Electrode Positions in Map box the electrodes appear as small dots on the Map If you are using your own naming conventions for electrodes you can enter the electrode po sitions by choosing Configuration gt Preferences from the menu and choosing the Elec trode Positions tab see also Section 4 5 on page 73 Figure 6 32 Map filter for continuous time data w Map elaks ntage Configuration Window Help Ex jss vlaf lal Fallal nin ALL Noch Rh iii BEBE o H i l gt 3 If you apply the Map filter to segmented data you are able to show the average voltage dis tribution of the entire segment or of several partial segments
104. of equal size The settings for segmented time data are the same as those for continuous time data with the following exceptions gt The Display Interval ms text box is not available gt Inthe Number of Equal Sized Subsegments to Map text box you specify the number of partial segments to be displayed per segment When the partial segments are represent ed as a Map the data points for each channel that belong to each partial segment are av eraged before they are used for interpolation The Scale Minimum pV Scale Maximum uV Extrapolate Edges for Full Map and Show Electrode Positions in Map functions are still available see also the description under Continuous time data on page 110 in this section Segmented time data Map 111 112 Chapter 6 Basic filters You are able to append an Average filter to the Seg mentation filter in order to view both the segments and the average as amap Figure 6 33 Configuring the Map filter for segmented time data wg me ce Loreta MRI Filter Map Type Purpose Parameters Linear Derivation Map Parameters Map Filter dis Mapping Display Interval ms Scale Minimum pV Scale Maximum pV Number of Equal Sized Subsegments to Map JV Extrapolate Edges for Full Map IV Show Electrode Positions in Map OK l Cancel Figure 6 34 Map filter for segment
105. of the TR and only those data points from TR sections in which the template drift has a similar value are included in each template The individual templates can be seen as being offset by a given fraction of the sampling interval If several templates are used the number of TR sections added to each template after a spec ified period is reduced proportionally The more TR sections a template contains the more meaningfulthe data will bethat is corrected using this template Forthis reason the number oftemplates used should not be too large three is a suitable value The following diagram shows the filter with three templates and indicates which data point is added to which template Depending on the value by which the first point of a TR section is offset in relation to the TR of the scanner the data points are included in different tem plates The top template contains data points with the template drift of 2 3 ofa sampling in terval and the bottom template contains points with no template drift Gemessene Datenpunkte aus Sicht des Filters El BR N DER Ka I N EN A UN KR NN ER HN LEN DR a EA EN RR a EB Zuordnung der Datenpunkte zum Template der L nge TR Die wahre TR des Artefakts ist um einen Drittel Datenpunkt l nger Because the difference between the true and nominal TR is not generally an exact fraction of the sampling interval it cannot be assumed thatthis method can completelycompensate for discrepancies ari
106. ogether with other products and components BrainVision RecView is foreseen by the manufacturer to be combined with BrainVision Re corder 23 24 Under normal conditions RecView does not cause any conflicts with other programs that are 25 Chapter 1 Installation already installed Brain Products GmbH however only guarantees that programs will inter act without problems ifthe programs concerned have been tested for compatibility This ap plies to the EEG analysis software BrainVision Analyzer and to the Microsoft operating systems Windows XP Windows Vista Windows 7 and Windows 8 provided that no modifications to the configuration ofthe operating system as delivered have been undertak en including official service packs and updates To use RecView you must have installed the recording software BrainVision Recorder Ver General conditions sion 1 10 or later on your computer and you must possess a license for RecView If you are using additional computers you must ensure that there is a TCP IP network con nection between the computers The system has the following hardware and software requirements System requirements gt Operating system Windows XP Service Pack 3 or later Windows Vista Service Pack 1 Windows 7 Windows 8 Minimum configuration Intel Pentium IV 2 GHz processor or higher 512 MB of RAM graphics card with 64 MB of RAM Minimum 1 GB free hard disk space Additional
107. ogram folder right click the application RecView exe and choose Run as administrator see Figure 3 20 Figure 3 20 Right clicking to run RecView as administrator GD e E gt Computer Windows7_0S C Vision RecView 4 Search Recvien Organize v a Open Burn New folder g S Favorites Name Date modified Type Size B Anatomies 8 20 2013 12 01 PM File folder EE Desktop J Workfiles 4 30 20137 49 AM File folder SL RecView pdf 5 2 2013 11 18 AM Adobe Acrobat D 14 990 amp RecView exe 147 Application 703 AverageFilter dll Open Application extens 32 BandPowerTrigge Run as administrator Application extens 60 2 BipolarMontage c STE p Application extens 18 BridgeTool dli Application extens 52 DevExpress Data d Cut Application extens 148 2 DevExpress Utils d Copy Application extens 484 DevExpress XtraEo Create shortcut Application extens 688 DevExpress XtraGr Delete Application extens 1 016 FFTFilter dll Rename Application extens 39 FrequencyFilter dl Application extens 28 ae Otherwise an error message is output and RecView terminates monitoring mode see Figure 3 21 All the other filters in the filter tree may nevertheless continue to run in the background after you have closed this error message Figure 3 21 Example error message from the Level Trigger filter if the LPT port address is not specified a BrainVision RecView Error
108. on Open Manual German Version If Microsoft NET Framework 4 0 is not present on your system then the following mes sage is output here see Figure 1 9 and the installation procedure is aborted Figure 1 9 Error message output if NET Framework Version 4 0 is not present r 4 BrainVision RecView 1 4 Setup BrainVision RecView 1 4 requires NET Framework 4 or A higher Please install NET Framework 4 before running this Setup again NET 4 can be obtained from the BrainVision program CD or following the download link on the Brain Products web site EXT 10 The BrainVision RecView 1 4 2 Setup dialog box opens Click Next see Figure 1 10 32 Chapter1 Installation Figure 1 10 BrainVision RecView 1 4 2 Setup dialog box for neurop Welcome to the BrainVision RecView 1 4 2 Setup Wizard The Setup Wizard will install BrainVision RecView 1 4 2 on your computer Click Next to continue or Cancel to exit the Setup Wizard ents 11 To continue with the RecView installation you must accept the applicable license agree ment Click Next see Figure 1 11 Figure 1 11 Accepting the RecView license agreement End User License Agreement Please read the following license agreement carefully Licensing Terms 1 Scope of validity and subject of the agreement The following terms apply to the provision and use of the computer program BrainVision RecView developed by Brain Products GmbH refe
109. ore if the filter is to function effi Notes on use ciently We also recommend automatic downsampling to 250 Hz in this case If incorrect R peaks are to be marked enter a higher value in the Minimal Pulse Period ms text box If this does not result in any improvement increase the value in the Minimal Cor relation text box by one tenth e g from 0 7 to 0 8 or reduce the value range of the accept able amplitude correlation e g from 0 6 to 1 2 to 0 7 to 1 1 etc If R peaks are skipped reduce the value in the Minimal Pulse Period ms text box If this does not result in any improvement increase the value in the Minimal Correlation text box by one tenth e g from 0 7 to 0 6 or reduce the value range of the acceptable amplitude cor relation e g from 0 6 to 1 2 to 0 5 to 1 3 If the R peaks are identified correctly but the artifacts are not corrected the selected correc tion interval is too coarse The Pulse artifact filter does not permit any overlapping correction periods This means that the sum of the values Correction before Peak and Correction after Peak must be smaller than the minimum actual period between two successive R peaks Because the pulse artifact template is not continuously rebuilt despite the fact that the rest ing pulse of the test subject may change during measurement it could be helpful to reset the template You can rebuild the templates at any time by clicking the Reset Template in Pulse artifact Fil
110. orts of your computer before you start the RecView Start RecView by double clicking the RecView shortcut P which you will find on your desktop after installation has been completed successfully Installing RecView under Windows Vista Windows 7 and Windows 8 27 1 2 Installing RecView under Windows Vista Windows 7 and Windows 8 Proceed as follows to carry out installation under Windows Vista Windows 7 Windows 8 1 Start Windows Vista Windows 7 Windows 8 2 Insertthe supplied BrainVision program DVD into your CD ROM drive Please make sure that you possess the most recent 3 If your computer is set up to autostart a CD ROM then the AutoPlay dialog box opens au RecView program version tomatically after a short period Click Run Autorun exe see Figure 1 1 In this case skip including any updates You can check whether a more recent version is available on our Web site at http Figure 1 1 AutoPlay dialog box for Windows Vista Windows 7 www brainproducts com down loads php kid 3 amp tab 1 step 4 and continue with step on page 28 of these installation instructions am DVD RW Drive E 100309_1642 F Always do this for software and games General options Open folder to view files using Windows Explore 4 Ifyour computer is not set up to autostart CD ROMs you will have to run the installation file manually Proceed as follows a Click the Start button on
111. ot possible to guar antee that timing will be accurate to the nearest millisecond Behavior of TTL pulses in different parameter configurations 149 Figure D 1 Diagrammatic representation of the behavior of TTL pulses Ploysesy J8MO7 a sed Sw poued uoNqyul 1y H __ J9yJoue x QUO PJM AO S S Nd S ploysauyy saddq _ sw y 6ua7 esind TLL IV IV An An 150 Appendix D Behavior of TTL pulses in different parameter configurations 151 Appendix E Legal notes WinRingo RecView uses the WinRingo library from OpenLibSys org in order to control the parallel port In compliance with the conditions ofthe modified BSD license we reproduce the redistribu tion conditions here The Copyright text refers only to the WinRingo files present in the dis tribution WinRingO dll WinRingOx64 dll WinRingO sys WinRing0x64 sys WinRingO vxd Copyright c 2007 2009 OpenLibSys org All rights reserved Redistribution and use in source and binary forms with or without modification are permit ted provided that the following conditions are met 1 Redistributions of source code must retain the above copyright notice this list of condi tions and the following disclaimer 2 Redistributions in binary form must reproduce the above copyright notice this list of con ditions and the following disclaimer in the documentation and or other materials provided with th
112. ou purchase subse quently To activate the downloading of sub licenses your USB dongle must first be registered Todo Downloading sub license files this choose Downloads amp Support Product Registration at www brainproducts com To register your dongle enter the external and internal serial ID of your dongle your name university and email address in the product registration form see Figure B 1 The external serial ID is printed on your dongle You can find out the internal serial ID using the Serial ID Check Program available on the web site Further information is available at www brain products com productreg php Once your registration has been processed you will receive a confirmation mail Figure B 1 Data entry form for product registration Product Registration About Brain Products H Serial ID Check Program Dongle Driver Projects amp References Type zip Size 289 1 KB Type zip Size 9 91 Workshops amp Events Hardlock number will be used as username Serial ID will be used as En ne Downloads amp Support Tile amp Namo University Institute Dep Overview Product Registration Email Postal Address Downloads fields are mandatory Register After you have received the confirmation mail you can log in see Figure B 2 to download your files by proceeding to the Login page Use the login data you received by mail BrainVision RecView User Manual Software Version 1 4 3 September 30 2
113. prematurely u B Discrete TTL Pulses mode without inhibition period r Trigger Configuration Discrete TTL Pulses Hysteresis Set TTL TTL Value fhex gt Upper Threshold Exceeded NI J or Lower Threshold UnderRun M 02 TTL Pulse Length ms 100 Inhibit additional TTL Pulses for Inhibition Period ms 1000 The curve at pin O and pin 1 is displayed BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 148 Appendix D Behavior of TTL pulses in different parameter configurations C Discrete TTL Pulses mode with specified inhibition period r Trigger Configuration Discrete TTL Pulses C Hysteresis p set TTL_ TTL Value hex gt Upper Threshold Exceeded 01 Lower Threshold Under Run Vv 02 TTL Pulse Length ms fioo IV Inhibit additional TTL Pulses for Inhibition Period ms jod The curve at pin 0 and pin 1 is displayed D Discrete TTL Pulses mode with specified inhibition period M Trigger Configuration Discrete TTL Pulses C Hysteresis Set TTL TTL Value hex ppe eshold Exceeded v Lower Threshold Under Run E 02 TTL Pulse Length ms foo IV Inhibit additional TTL Pulses for Inhibition Period ms 400 The curve at pin 0 is displayed You should note that the accuracy of the reset timer and the inhibition period timer depends on the resolution of the Windows internal system clock It is therefore n
114. pt no liability for loss or damage caused to your devices by strong magnetic fields if laptops or computers are located in the MRI room This does not just apply in the USA but worldwide The manual or automatic triggering of the MRI based on the detection of special wave forms during the monitoring of inbound data may potentially result in the infringement of patent Brain Products GmbH accepts no liability or responsibility in the event of the improper use of our devices and or software for such purposes The BrainAmp MR and BrainAmp MR plus amplifiers and the BrainVision Recorder recording software are not able to send triggers based on the detection of special wave forms in an EEG e g spikes You can find further information on the US patent office s web site at http www uspto gov patent number 5 445 162 and referral Alternatively please contact Brain Products GmbH directly BrainVision RecView is able to send triggers The use of this function within the framework of the above mentioned patent protected procedure should be avoided in the USA You can find further information on the US patent office s web site at http www uspto gov patent number 5 445 162 and referral Alternatively please contact Brain Products GmbH o 153 List of abbreviations Belinea Brain Computer Interface VERRAT Conformit amp europ amp enne European Conformity ECG aan Electrocardiogram EDA Eee Electrodermal activity BEG ui ee elta European
115. r if the test sub ject moves or talks If the filter identifies more gel bridges than a fixed upper limit that is de pendent on the number of channels used then the Bridge Tool filter switches to Automatic Mute Mode In this mode the Paired Channel View statically displays all the potential gel bridges as dark red lines If these lines are simply artifacts the Bridge Tool filter switches back to normal mode as soon as the EEG is free of artifacts again and the indicated bridges have disappeared again If gel bridges are actually present and the static red lines persist we recommend that you in terrupt the measurement and prepare the electrodes again using a considerably smaller quantity of gel As a guideline gel quantity we recommend using approximately 10 cm of gel for 30 channels Bridge Tool 89 Figure 6 9 Displaying gel bridges in the Paired Channel View indow Help alal Al Sensitivity HIGH Before performing any measurements with test subjects for research purposes you should Tips on the use of the Bridge conduct a number of test data acquisitions in order to gain experience of the conditions of Tool filter use of the Bridge Tool filter for example concerning the test subject s hair length and head shape the amount of gel to be applied and the position of the electrode cap If you still have little experience of preparing electrodes we recommend that you should pro ceed as follows when using the Br
116. r1 Installation Figure 1 6 Confirmation query before installing Microsoft Net Framework Version 4 0 Program name dotNetFx40_Full_x86_x64 exe Verified publisher Microsoft Corporation File origin CD DVD drive amp Show details 8 You must accept the applicable license agreement before you can continue with the in stallation of Microsoft NET Framework Version 4 0 After doing this click nstall in the Microsoft NET Framework 4 Setup dialog box see Figure 1 7 amp If you are asked to do so reboot your computer Figure 1 7 Accepting the Microsoft NET Framework Version 4 0 license agreement RB Wicrosott NET Framework 4 Ser NET Framework 4 Setup I Please accept the license terms to continue Microso MICROSOFT SOFTWARE SUPPLEMENTAL LICENSE TERMS Download size estimate OMB Download time estimates Dial Up O minutes BRAIN ISION BRAI BRAIN ISION ofsi ANALYZER Profession RECORDER rofesoro Brain Products GmbH 7 82205 Gilching 9 When Microsoft NET Framework Version 4 0 has been successfully installed click nstall RecView Software on the second page of the installation dialog see Figure 1 8 Installing RecView under Windows Vista Windows 7 and Windows 8 31 Figure 1 8 Installing RecView second page of the installation dialog BrainVision RecView us Dora Gi Solutions Please choose from the options below Open Manual English Versi
117. ration Discrete TTL Pulses Hysteresis gt Upper Threshold Exceeded Lower Threshold Under Run TTL Pulse Length ms IV Inhibit additional TTL Pulses for Inhibition Period ms You can enter the limit values for the required frequency band in the Minimal Frequency Hz and Maximal Frequency Hz text boxes 82 Chapter 6 Basic filters If the option Calculate Raw Sum of Squared Values is se lected then the threshold values are specified in V In the case of Calculate Power Density these values are specified in yV2 Hz and in the case of Calcu late Relative Band Power they are specified in There are three different ways of calculating the band power Calculate Raw Sum of Squared Band Values The squared values of all the frequency val ues within the previously defined frequency band are totaled You should note that the number of totaled frequency values depends on the resolution Calculate Power Density The power density is displayed gt Calculate Relative Band Power The system calculates the ratio of the power within the defined frequency limit values to the power of the total spectrum of the signal For all three calculation options you can enter an upper and lower threshold value in the Lower Bandpower Threshold and Upper Bandpower Threshold text boxes A trigger is then sent to the LPT port if the value rises above or falls below these threshol
118. rder software 38 2 8 Entering the servername 39 2 9 Calling the dialog box for selecting the Work Files folder 40 2 10 Selecting the Work Files folder 40 2 11 Calling the dialog box to enter the LPT port address 41 2 12 Entering the address of the LPT port 41 BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 x Listoffigures Chapter 3 Getting started and handling the program 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 3 10 3 11 3 18 3 19 3 20 3 21 3 22 3 23 3 24 3 25 3 26 3 27 3 28 Menu barand toolbar 43 RecView interface 46 Tabs for switching between filter windows 47 Scaling bar at the end of the channel list 47 Scaling bar display in front of each channel 47 Markers displayed 48 Starting data viewing recording in the Recorder 48 Simultaneous data view in the Recorder and RecView 49 Individual channel mode 49 Global deactivation of achannel 50 The VEOG channel has been deactivated globally and the HEOG channel locally 50 Impedance mode in the Recorder and impedance viewin RecView 51 Dialog box for selecting the master filter 52 Empty filter tree 53 Adding subnodes to main filter nodes by means of drag and drop 54 Invalid filter combination Frequency filter attached to FFT filter 54 Details on the currently selected filter 56 Context menu for filters 57 Invisible LORETA filter 57 Right clicking to run RecView as administrator 58 E
119. re to be added see Figure 6 23 Figure 6 23 Adding lobes z Loreta Transformation Definition of Regions of Interest Select Lobe Limbic Lobe Occipital Lobe Parietal Lobe Sub4obar Temporal Lobe In the same way as Selecting lobes you can use the Add Gyrus and Add Brodmann Area buttons to add gyri and Brodmann areas to the ROI The ROIs are defined block point circle using the MNI coor dinate system The Add Current Position button allows you to add a specific position to the ROI see Figure 6 24 You can choose whether to add the nearest voxel to the mouse pointer by se lecting the Nearest Voxel option or to define a sphere with a specified radius around the cur rent position by selecting the Sphere around Point option LORETA 105 Figure 6 24 Adding a specific position are ansformanan finitiomaiRegions of Interest ROI from Actual Position Actual Position x y z 1 24 22 ee Nearest Voxel Remove ROI C Sphere around Point Remove All with Radius mm 3 The Add Block button allows you to add a rectangular block whose limits you can specify see Figure 6 25 Figure 6 25 Adding a block ROI by Borders New ROI x Left Right y Ant Post i Remove ROI Min iD J a Max 2 Remove All The Details of Selected Region of Interest box lists all the specifications shown above see Figure 6 26 106 Chapter 6 Basic filters
120. rred to hereinafter as Brain Products the user documentation user manual and any other associated written material as well as all copies updates upgrades and any _ nathar nAditinnn nemadad bee Penin Denadiinta fall nf suhiah lt accept the terms in the License Agreement a Caen Coe 12 You select the program folder for RecView during installation see Figure 1 12 Installing RecView under Windows Vista Windows 7 and Windows 8 33 Figure 1 12 Selecting the program folder i Destination Folder Click Next to install to the default folder or d ck Change to choose another Install BrainVision RecView 1 4 2 to 13 The system asks you if you really want to perform the installation A user account control dialog box appears Accept the installation see Figure 1 13 Figure 1 13 Security query under Windows 7 and Windows 8 Program name RecView msi Verified publisher Brain Products GmbH File origin Hard drive on this computer X Show details 14 Follow the installation instructions which are now displayed until installation is complet ed 34 Chapter1 Installation After successful installation of Connect the supplied USB dongle to one of the USB ports of your computer before you start RecView and the required soft RecView Start RecView by double clicking the RecView shortcut 9 which you will find on ware components your desktop after installation has been completed successful
121. rs data itself Channel Name Attenuation Remove Row nie Configuringthe axes 69 4 2 Configuring the axes The Axes tab allows you to configure the x and y axes Figure 4 4 Configuring the axis parameters ree TV Scaling Graph Display Frequency Bands Electrode Positions Filter Tree Configuration Domain Master Switch Time Domain m X Axis Y Axis C Show Never Show Never Show if Size is Sufficient Show if Size is Sufficient Show Always Show Always IV Show Unit Label IV Show Unit Label Tickmark Settings Tickmark Settings Tickmark Spacing Automatic Tickmark Spacing Automatic Tickmark Length Automatic Tickmark Length Automatic Labels Shown Yes Labels Shown Yes Label Spacing Automatic Label Spacing Automatic Label Tick Length Automatic Ge Label Tick Length Automatic pees The Domain Master Switch drop down list allows you to specify whether the settings refer to the Time Domain or to the Frequency Domain You can make the following settings separately for the x and y axes gt The Show Never Show if Size is Sufficient Show Always options allow you to specify whether the axis is not to be displayed only to be displayed if there is enough space or always displayed gt Ifyou check the Show Unit Label box the units uV s Hz etc of the axes are displayed gt The Tickmark Settings group describes the
122. s R128 Ri Pe IV Downsampling to 250 Hz Downsampling with a Factor of You can configure the pulse detection parameters in Detection Parameters Pulse Reference Channel Look for a Model Pulse s Minimal Pulse Period ms Mark Pulse Peaks check box Minimal Correlation Minimal Amplitude Maximal Amplitude ECG reference channel RecView checks whether a valid chan nel has been specified and outputs an error message if the channel is not present The error message also indicates which channel will be used instead of the missing channel namely the last channel in the workspace s channel table Length of the training phase Minimum distance between two R peaks Specifies that detected R peaks are to be marked with R mark ers Contains the correlation threshold default 0 6 Contains the lower amplitude threshold default 0 6 Contains the upper amplitude threshold default 1 2 Correction Parameters Contains the correction parameters Number Pulses in Aver age Correction Before Peak ms Correction After Peak ms Number of preceding pulse beats that are to be taken into account for the currently used correction template default 10 Distance between the start of the correction interval and the R peak Distance between the R peak and the end of the correction interval Pulse artifact filter 129 130 Chapter 7 Optional filters Excluded from Correction Channels th
123. s of the interface If you have implemented this in terface you cannot implement the Dat aOut interface This means that the filter represents an endpoint in the filter tree IDataView optional This interface is also used for visualization but has a far more complex structure It inte grates visualization into RecView itself It is also able to handle the existing buttons for scal ing and setting the time etc Because it is so complex we shall not deal with the IDataView interface here We recommend that you use ISimpleView instead IUITools optional UI User Interface This allows you to provide users with buttons on a toolbar in order to perform corrections in teractively for instance You can also output information in one of the fields of the status bar The following paragraphs list some examples of filters using different interface combina tions gt The frequency filter uses the interfaces IDataIn IDataOut and IFilterParame ters If this filter only allowed fixed frequencies it would not be necessary to use the IFilterParameters interface The map implements IDataIn IDataOut IFilterParameters and IDataView IDataView is implemented because RecView is not able to represent topographical data implicitly The MRI artifact filter implements the interfaces IDataIn IDataOut IFilterPa rameters and IUITools IUITools is used to allow the user to reset the template used while the data is being displayed A s
124. s you re quire You enter the number of input channels in the Number of Used Input Channels text box You can use the Refresh button to update the coefficient matrix As an alternative to the manual entry of the input channels you can also read in a coefficient matrix from a text file by clicking the Load from File button If you choose this method then you do not need to edit the channel matrix in RecView The matrix must have the following structure Table 6 1 Structure of the channel matrix that is to be read in Channel1 Channel2 Channel3 New1 Coefficient Coefficient Coefficient New2 Coefficient Coefficient Coefficient a The decimal separator used in the coefficients is the decimal point Linear Derivation 101 Settings Method 1 Manual entry in the channel matrix Method 2 Reading in the LDR matrix 102 Chapter 6 Basic filters You can also read in ICA matrices that have been exported from the Analyzer or coefficient matrices that have been generated and stored using the Analyzer s Linear Derivation trans form Reading in exported ICA matrices permits the Online output of ICA components that have been calculated offline using the Analyzer To save the matrix click Save to File TheRemove Line and Remove Column buttons allow you to delete the selected rows or columns from the matrix Figure 6 20 Generating new channels using the Linear Derivation filter Fp1 2
125. see Figure C 1 You can see the first start address in the O range under Resource Settings Figure C 1 Displaying the address of the LPT port in the Windows Device Manager Eigenschaften von ECP Druckeranschluss LPT1 PR Allgemein Anschlusseinstellungen Treiber Details Ressourcen 3 ECP Druckeranschluss LPT 1 Ressourceneinstellungen Ressourcentyp Einstellung WH DMA 03 WWE ABereich 0378 037F WHE ABereich 0778 077F Automatisch konfigurieren Ger tekonflikt Keine Konflikte BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 145 146 Appendix C How can find the address of the LPT port 147 Appendix D Behavior of TTL pulses in different parameter configurations On page 143 of Appendix E you will find a diagrammatic representation of the behavior of the TTL pulses in response to different parameter configurations of the Band Power Trigger filter see also Section 6 2 as of page 81 and Level Trigger filter see also Section 6 7 as of page 96 A Hysteresis mode r Trigger Configuration Discrete TTL Pulses Hysteresis Set TTL TTL Value hex gt Upper Threshold Exceeded V o iy 02 TTL Pulse Lenath ms j Vv bit additional TTL Pulses f Inhibition Period ms The curve at pin 0 is displayed The depictions in B and C indicate the settings you can make to prevent signals from being overwritten
126. sing from template drift Nevertheless the quality of the correction is im proved Template drift detection The MRI artifact filter uses a procedure to automatically determine the template drift from the data This is necessary if the user does not know the exact value of the template drift Tem plate drift detection works reliably if the TR is known to an accuracy of one sampling interval Scanner timing discrepancies greater than one sampling interval can be compensated for by setting an adjusted TR The template drift is determined by observing the marked narrow peaks in the data A peak of this type cannot come from the normal EEG signal as this does not generally have gradi ents of a comparable magnitude By comparing the positions of the peaks of different TR sections it is possible to determine the template drift between the sections in real time even if a TR section has only been par tially read This method is particularly suitable for comparing consecutive TR sections Because tem plate drift is the result of a constant discrepancy between the scanner and the amplifier it MRI filter 123 124 Chapter 7 Optional filters Basic settings of the MRI arti fact filter remains constant between two consecutive TR sections As a result the average can be drawn across a large number of individual measurements of the template drift giving a value which is not subject to temporary interference in the data The template drift
127. sis of the proportion of large gradients remain ing in the corrected data If there are a large number of high gradients in the corrected data this is an indication that the artifact has not been removed reliably It is however possible that some large gradients remain in data which has nevertheless been corrected sufficiently well The Reset Threshold text box allows you to specify the percentage of data which is permitted to contain large gradients If the filter encounters gaps in the measurement data this is an indication of temporary over loading of the computer on which you are running the program The filter will attempt to bridge a gap of this type to avoid aborting the current correction The value in the Maximum Gap Fill TRs text box specifies the maximum number of TRs that are bridged Figure 7 3 MRI artifact filter BrainVision RecView MRI Filter F File Display Montage Configuration Window Help x ala Meals viale RI elel Ns mo TITT Fpt Fp Fp2 F3 A F3 F4 ae eae SEN F4 os a an c3 c4 y c4 P3 a en et P3 P4 m o1 av paaie avn a o ow Re Fr AN mn F7 row mld m Ww A 7 ul T8 mo p PS Pe Ve Fz Fz on cz cz t Pz Pz t pen E Fc2 m ci oe NSORENMBEN cP2 nt a Canam Fes M Lot Foe v ae L cps M CP6 TP9 TP10 Eog Ekg1 A A Ekg2l
128. ssigned to it are displayed The sequence of channels can also be changed using montages so that channels which were originally apart can be shown next to each other A channel can also be displayed multiple times in a montage A montage is used for visualization purposes only The resulting data only exists temporarily and is not passed to downstream filters The current version of RecView does not allow you to create montages On the other hand you can use all the montages created in the Recorder and the montages from the Analyzer with the exception of Laplacian Reference montages To show all the montages in the Work Files folder click Display Montage in the RecView menu bar Select a montage to apply it to the main window Choosing Display Montage gt Current Filter from the menu lists all the montages for the active filter window if you have created a filter tree see Figure 5 1 Always use the Current Filter function if you want to apply a montage to the active filter Figure 5 1 Displaying and selecting montages A Gran Sr File View Display Montage Configuration Window __ Hel fe BrainVision RecView d wish Ff File Display Montage Configuration Window Help x Options E Current Filter gt Standard Montage p3 Standard Montage ee uk ee 1 Bipolarl er Peel Bipolar Zz d Bipolar2 Original Original FA a ee eee ren 100 pV FC5 ren 100 uv FC1 una ann
129. storage requirements depend on the ex tent of the data to be processed We recommend a monitor with a screen diagonal of at least 17 For more than 32 chan nels you should use a 21 monitor BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 26 Chapter1 Installation Please make sure that you possess the most recent RecView program version including any updates You can check whether a more recent version is available on our Web site at http www brainproducts com down loads php kid 3 amp tab 1 After successful installation of RecView and the required soft ware components 1 1 Installing RecView under Windows XP Proceed as follows to carry out installation under Windows XP 1 Start Windows XP 2 Insert the supplied BrainVision program DVD into your CD ROM drive 3 If your computer is set up to autostart a CD ROM the menu that guides you through the installation will appear after a short time If your computer is not set up to autostart CD ROMs you must run the installation program manually Proceed as follows a From the taskbar choose Start gt Run a Clickthe Browse button b Inthe Browse dialog box select your CD ROM drive and double click the Autorun exe file to open it 4 Follow the instructions displayed The installation process that follows is described in section 1 2 step 5 as of page 28 Connect the USB dongle of BrainVision to one ofthe USB p
130. t Ignore in Drift Detection Channel Lis Size Threshold uV fo 0 Bracketing Threshold 1V ms Bi Use Constant Template Drift Drift Value of Sampling Interval 0 IV Enable Automatic Template Resets Reset Threshold 1 Maximum Gap Fill TRs 2 Lok _ c If the TR has been specified correctly the default settings for automatic template drift detec tion are as a rule suitable for processing the data reliably However it is possible that modi fications need to be made for particular sets of measurement data in order to adjust the method to the particular conditions that apply to this data Select the Automatically Detect Template Drift option to use automatic template drift detec tion In the gnore in Drift Detection Channel List text box you can specify a list of channel names which are not to be used for drift correction The list is separated by commas This al lows you to prevent individual channels with extremely atypical data from negatively impact ing the template drift detection process The Size Threshold uV parameter specifies the minimum size of the peaks which are used for template drift detection The Bracketing Threshold uV ms text box specifies the gradient that delineates the peaks from the neighboring data points Minima are only used if this gradient is exceeded It can be necessary to reduce the values in these boxes if the overall strength of the artifacts or the typical arti
131. t is caused by the strong static magnetic field combined with movements of the electrodes in time with the heart frequency of the test subject The MRI artifact filter allows you to considerably reduce artifacts belonging to the first cate gory The EEG signals then become clearly visible again and you can now identify saturated channels or channels subject to other interference Correction is carried out on the basis of averaging In principle recurring intervals are aver aged in phase with artifact generation This causes the randomly distributed EEG signals to be dropped from the averaged curve ideally leaving only the external influence of the scan ner This is now used as a template and is subtracted from the individual sections in a sec ond step What is left is the useful signal The MRI artifact filter is simple to use However the Time of Repetition TR i e the time be tween two consecutive gradients must be exactly known to an accuracy of one sampling in terval Template drift compensation Initial methodological considerations Template drift is the temporal offset of the scanner TR relative to an integer multiple of the sampling interval of the EEG amplifier This happens either because the TR has not been matched to the sampling rate of the amplifier or because the amplifier and the scanner have a slightly different interpretation of the exact length of 3000 ms for example It is for in stance possible that the scann
132. t voxel containing stored physiological data gt The next three lines indicate the associated anatomical data of the brain areas in the vi cinity of the mouse pointer Figure 6 27 Display of the mouse pointer in the cross section and the information field Add Lobe kbonao Add Gyrus fz Add Brodmann Area Add Current Position Add Block X 1 Y 51 Z 26 Import ROIs Best Match at 2mm Brodmann area 9 Export ROIs Frontal Lobe Medial Frontal Gyrus Export Blank ROIs Fi When the LORETA filter is used each ROI is represented as a virtual channel see Figure 6 28 108 Chapter 6 Basic filters Scaling the virtual ROI chan nels Figure 6 28 Virtual channels Frontal and Frontal_2 Frontal 0 02 pA mm4 Frontal_2 0 02 Atimm 4 PERE EEA Because very flat data is displayed if the unit HA mm is used we recommend that you scale the data upwards considerably in the LORETA filter window In the Preferences menu specify individual scaling for your virtual ROI channels to avoid having to re scale the data subsequently each time a new connection is established between the Recorder and RecView When you do this assign unique names that are not used in the original data set to the ROI channels To open the dialog box for configuring preferences choose Configuration gt Preferences from the menu On the Scaling tab click Set Individual Scalin
133. ter R button in the toolbar 132 Chapter 7 Optional filters 133 Chapter 8 Programming user defined filters Chapter 8 contains programming instructions for developing user defined filters Please note that Brain Products is unable to provide any support with respect to implementation details We shall supply descriptions and examples of filter implementations 81 Overview You can extend RecView to include filters you have programmed yourself Filters are made up of program libraries that use the Microsoft NET runtime environment The following requirements apply if you wish to develop your own filters gt A general knowledge of programming Knowledge of a NET programming language our examples use C gt gt Understanding of the terms interface class and attribute in the context of NET gt A development environment for NET components for NET Version 4 0 Our sample proj ects were developed using Microsoft Visual Studio 2010 Copy the compiled filter DLL into the program folder so that RecView is able to find it You will find help and examples in the folder RecView Filter Development on the BrainVision program DVD A filter is always implemented in the form of a collection of interfaces within a class A special filter attribute describes the filter for RecView The interface and structure descriptions and the filter attribute class are contained in the file Recorderinterfaces dll which is located in the pro
134. ter is active see also Section 7 1 as of page 121 At the top right of the RecView window is another toolbar that applies to the currently active filter window right hand window This contains the following buttons Al Scale Up x Scale Down Decrease Channels Increase Channels Y Next Group Previous Group and Baseline Correction in Display Their functions and keyboard shortcuts are the same as those of the main toolbar However note that you have to press the key combination Ctrl Shift rather than just the Ctrl key to use the keyboard shortcuts The status bar at the bottom of the RecView window is made up of the following sections eel The first section shows the current status of the program Not Connect ed Connected Monitoring Impedance Check etc The second section shows the type of montage used For further infor mation on montages refer to Chapter 5 as of page 75 Boda Ok The third section block indicator shows whether the data blocks sent to RecView by the Recorder have been completely processed Blocks Ok or whether blocks have been lost during data transfer Blocks Lost Data may be lost during transfer if RecView is unable to accept the data in time due to high loads Standard Workspace The fourth section contains the name of the current workspace For fur ther information on workspaces see Section 3 5 as of page 62 Frequency Filter
135. the transforms of our EEG analysis soft ware BrainVision Analyzer BrainVision RecView User Manual Software Version 1 4 3 September 30 2013 21 22 Introduction You can run RecView on the computer on which the Recorder is installed or on further com puters in the network This networking capability means that you can run up to ten RecView programs simultaneously on different computers in conjunction with just one Recorder Intended use As of September 30th 2013 and software version 1 4 3 BrainVision RecView is not a medi cal device anymore and may be used in the context of non medical applications in order to carry out fundamental or applied research on the basis of neurophysiological methodology and data RecView is intended to be used for visualizing and processing electrophysiological signals e g EEG EMG ECG EOG and or signals from other approved sensors RecView allows ExG data to be viewed concurrently while it is being recorded using the ExG recording software Recorder and is only to be used in conjunction with the Recorder Use of the RecView for diagnosis therapy monitoring of vital life functions such as cardio vascular functions etc or other medical purposes is expressly forbidden The user is solely liable for any risks to test subjects associated with the investigation if the software is not used in accordance with the correct use described Brain Products GmbH pro vides no guarantee and accepts no li
136. the value range of the EEG signal is subdivided during digital acquisi tion A higher resolution means finer granularity and more accurate acquisition of the original signal Unit pV S Sampling rate Number of data points measured per second when acquiring an EEG digitally Scaling In the context of displaying the EEG signal scaling is the assignment of an amplitude value in pV to an interval Segment A section of the EEG resulting from segmentation q v Segmentation Subdivision of the EEG into different seg ments epochs Segmentation can be based on a number of different criteria On the one hand segmentation is under stood to be a preliminary stage in the analysis of evoked po tentials Epochs of the same length are generated relative to a reference marker a stimulus for example This results in a data set consisting of a sequence of segments or epochs On the other hand segmentation is understood to be the preparation of separate processing steps for different sec tions of an EEG for example for the analysis of different stag es before and after medication Server The address of the computer on which the Recorder software is running see also RDA Sub license File associated with the dongle and which can be used to enable optional functions Extension bplcs T Ten ten system 10 10 system One additional electrode is positioned between each of the electrodes of the 10 20 sys tem q v Ten twe
137. thout overlap left and with overlap right FFT1 Fpi nv i 35 PrE E P 25 n FO We ER AP EE E e A E 1 20 40 60 80 100 Hz 20 40 60 80 100 Hz W Sub Delta MM Delta E Alpha W Beta E Theta lt None gt W Sub Delta Ml Delta E Alpha W Beta E Theta FFT Fast Fourier Transform 93 94 Chapter 6 Basic filters Summary Settings 6 6 Frequency Filter The Frequency Filter is used to restrict the bandwidth to a particular frequency range It also allows you to select a 50 or 60 Hz notch filter Check the appropriate box Low Cutoff Filter High Cutoff Filter Notch Filter to specify what filter is to be used high cutoff low cutoff notch In the case of the Low Cutoff Filter enter the lower frequency threshold in Cutoff Frequency Hz The Slope dB oct drop down list allows you to determine the slope of the filter As with the Low Cutoff Filter in the case of the High Cutoff filter enter the upper frequency threshold in Cutoff Frequency Hz and the filter slope in Slope dB oct In the case of the Notch Filter you can select a Frequency Hz of 50 or 60 Hz The slope of this filter is fixed at 48 dB octave and cannot be selected explicitly Figure 6 14 Parameters dialog box for the Frequency filter Frequency Filter Parameters x IV Low Cutoff Filter Cutoff Frequency Hz 0 3 Slope dB oct 24 it IV High Cutoff
138. ts the stored average from the current segment Figure 6 3 Average filter Se a x ale e l ss1 vl ali T Segment Count 7 Fp1 mm mn TI nn ae O i m y 100 pv i Fp2 I a aa a 100 pv AF3 m an m HIT TT 7 aan a pany L 1 100 pV H AF1 Marty i 100 pv AFz vi 100 pv AF2 we 100 pv i AF4 ul ee a gt Al A 100 pv ipta p 100 pv Band Power Trigger 81 6 2 Band Power Trigger The Band Power Trigger filter is used to send signals to the computer s LPT port as a function Summary of their band power values The use of this filter is particularly recommended within the framework of neurofeedback research The filter can only be used with frequency data FFT filtered data Prerequisites for use You must possess administrator permissions in order to use LPT port control Under Win dows Vista and Windows 7 you must also start RecView in Administrator mode even if you are already logged in as administrator at the computer see also section 3 4 on page 58 Figure 6 4 Parameters dialog box for the Band Power Trigger filter Settings Band Power Calculation Settings Minimal Frequency Hz Maximal Frequency Hz Calculate Raw Sum of Squared Band Values Calculate Power Density Calculate Relative Band Power Lower Bandpower Threshold in pV Upper Bandpower Threshold in pV M Trigger Configu
139. ually has the name RecView exe Shortcut You can rename this shortcut gt Right click on the shortcut and choose Properties Figure 3 30 Figure 3 30 Open the shortcut properties Z BrainVision RecView a Z RecView exe Shortcut x Create shortcut Delete Rename Click on the tab Shortcut In the field Target you can add one ora combination of the following commands see also Figure 3 31 Command Description and example Workspace Specifies the path to the workspace e g Workspace C Vision Workfiles 2131AAB HC rvwksp If the path contains spaces then use quotation marks Workspace C Vision Workfiles 2131 AAB HC rvwksp Server Specifies the IP address or PC name where BrainVision Recorder is run ning e g Server localhost Montage Specifies the Montage name e g Montage xyz If the Montage name contains spaces then use quotation marks Montage x y z The related file must be located within the Workfiles folder see page 40 Only specify the file name WITHOUT its extension MONT2 66 Chapter 3 Getting started and handling the program Example Verify Workspace qv Figure 3 31 Editing the command line Open File Location Change Icon _ Advanced If you click on the shortcut RecView starts and immediately opens the linked workspace in the example 2131AAB_HC rvwksp
140. ulse Value hex The TTL pulse is reset after the time specified in the text box TTL Pulse Length ms if the box has the value O then the pulse is reset immediately Pulses that are reset immediately or very quickly 20 ms cannot be displayed in the LPT sta tus output You should also note that the accuracy of the reset timer depends on the resolu R Peak Trigger 115 Summary Prerequisites for use Settings 116 Chapter 6 Basic filters tion of the Windows internal system clock It is therefore not possible to guarantee that timing will be accurate to the nearest millisecond You specify the threshold that is to be used in Detection Parameters gt Ifyou have set a threshold manually activate the Use following Threshold option and in the Threshold uV text box enter a voltage whose violation is to trigger the search for an R peak To specify a value manually you should record the ECG signal and search for suitable val ues see Figure 6 38 on page 117 and the accompanying explanation This manual defi nition is only suitable for data sets with a very regular ECG signal gt To perform an automatic search for a suitable threshold value activate the Estimate Threshold Automatically option The filter uses a variance criterion to decide where to set the threshold In the text box Time for Threshold Estimation s enter the period in sec onds during which the filter is to search for a suitable threshold A sensible v
141. uous time data 110 Map filter for continuous time data 111 Configuring the Map filter for segmented time data 112 Map filter for segmented and averaged time data 112 Configuring the Map filter for frequency data 113 Map filter for frequency data 114 Parameters dialog box for the R Peak Trigger filter 115 Chapter 7 Chapter 8 Appendix A Appendix B Appendix C Appendix D Appendix E 6 38 Negative ECG curve negative polarity with steep R peaks 117 6 39 R Peak Trigger filter 117 6 40 Parameters dialog box for the Segmentation filter 118 6 41 Segmentation filter 119 6 42 Display of the segment number and the Time Zero marker 119 Optional filters 7 1 Parameter dialog box for the MRI artifact filter 124 7 2 Advanced configuration of the MRI artifact filter 125 7 3 MRI artifact filter 127 7 4 Parameters dialog box for the Pulse artifact filter 129 7 5 R peak marker and correction ofa channel 131 Programming user defined filters Electrode coordinate system A 1 Coordinate system for electrodes 140 Installing the RecView license from the Brain Products web site B 1 Data entry form for product registration 141 B 2 Login form 142 B 3 Download area for sub license files 142 B 4 Installing sub licenses 143 B 5 Displaying sub licenses in the Recorder 143 How can I find the address of the LPT port C 1 Displaying the address of the LPT port in the Windows Device Manager 145 Behavior of TTL pulses in d
142. with relation to the measured artifact can be determined subsequently for a TR section which has already been read This is achieved by adding the section to section drift to the known drift of the previous section and also by directly calculating the template drift in relation to the first TR section measured Combining these values permits accurate determination of the template drift In order to assign the measurement data of the new TR section to a suitable template from the very start the template drift of the section must be known before the data is measured However at this time the template drift of the TR section which has just been processed is known as is the template drift between two consecutive sections The template drift of the new section can be predicted on the basis of these values Figure 7 1 Parameter dialog box for the MRI artifact filter MRI Artifact Correction p TR ms 3000 Advanced Settings Number of Templates 3 Template Drift Correction Ignore Channels in oo Automatic or of Sampling Interval Automatic Correction ictim Latt Automatic Template Resets Enabled Downsampling Ratio 20 Template Reset Threshold 1 Filter Frequency Hz 50 Br Filter Slope dB 48 v Cancel The TR ms text box specifies the time of repetition In the Number of Templates text box you can specify how many templates the filter estab lishes in order to improve correction quality in the event o
143. xample error message from the Level Trigger filter if the LPT port address is not specified 58 Data representation with a filter tree 59 Functions for arranging the filter windows 60 Enlarging the data window to show the data correctly 61 Creating anewworkspace 62 Saving the new workspace 63 Newly created BrainVision1 workspace 63 Loading an existing workspace 64 Chapter 4 Chapter 5 Chapter 6 3 29 Create shortcut on the Windows Desktop 64 3 30 Open the shortcut properties 65 3 31 Editingthe command line 66 3 32 Verify correct workspace 66 Configuring the user settings 4 1 Calling the Preferences dialog box 67 4 2 Configuring the scaling parameters 67 4 3 Scaling selected channels 68 4 4 Configuring the axis parameters 69 4 5 Configuring the subdivisions ofthe axis tickmarks 70 4 6 Configuring how graphs are displayed 71 4 7 Defining frequency bands 72 4 8 Selecting the electrode positions 73 4 9 Configuring fast access to the filter parameter dialog 74 Montages 5 1 Displaying and selecting montages A 75 5 2 Displaying and selecting montages B 76 5 3 Assigning keyboard shortcuts to montages 76 Basic filters 6 1 Software filters active in the Recorder have no effect in RecView 77 6 2 Parameters dialog box forthe Average filter 78 6 3 Average filter 80 6 4 Parameters dialog box forthe Band Power Triggerfilter 81 6 5 Band power trigger filter 83 6 6 Parameters dialog box for the Bipolar Monta

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