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BrainVision Recorder 1.10 User Manual

1. Bi Ena Pe of e CT M Stimulus fe Stimulus ST PR Stimulus T W Stimulus vw w w wf w e Response w dl w 41 41 4 we Response Iv __ Response I WM Response 12 Response Current State x z z BE fed x Cancel FIGURE 8 5 SETTING THE DIGITAL PORT BRAINAMP For each group of 8 bits bit o 7 and bit 8 15 you can define whether the signals are interpreted as high active 5 V active or low active o V active In addition pulldown high active or pullup low active resistors with a value of 4 9 kOhm are switched to ground or 5 volts at each input BRAINVISION RECORDER Amplifier specific properties BrainAmp family 8 1 In the Enabled column of the table you can specify whether the associated bit is to be evaluated or not In the Type column you can specify what time marker type each bit represents It is also possible to assign the same type to several different bits In principle you can freely select the name of the type You should however note that BrainVision Recorder and BrainVision Analyzer use color coding for certain types For this reason it is advisable to choose Stimulus and Response for stimulus and response inputs respectively The marker type DC Correction is also available if you are carrying out a DC measurement You can define this at any bit position 0 15 you choose Bits 8 15 are f High Active Input us
2. Force Save As Dialog when Monitoring Starts FIGURE 7 2 ADMINISTRATOR DIALOG BOX BRAINVISION RECORDER 7 1 1 7 1 Configuring the user privileges Program configuration You can make the following settings e Allow User Selecting Workspace specifies whether normal users are permitted to select a workspace e Allow User Editing Creating Workspaces specifies whether normal users are permitted to edit existing workspaces and create new ones e Allow User Editing Preferences specifies whether normal users are permitted to modify the preferences For further information on preferences see section 7 2 e By checking or unchecking the Allow User Editing Amplifier Specific Settings box you can enable or disable all the items in the Amplifier menu a5 Note that the Amplifier menu does not appear in the menu bar if you have selected the Simulated Amplifier under Configuration gt Select Amplifier Also note that the individual items in the Amplifier menu depend on the amplifier selected You will find a detailed description of the items in the menu in chapter 8 Amplifier specific properties e If you check the Force Save As Dialog when Monitoring Starts box the Start button is implicitly activated every time the EEG view is called thus causing the Save dialog box to open 7 1 2 BRAINVISION RECORDER Program configuration Configuring the user settings 7 2 7 2 Configuring the user settings
3. To select a new montage for a data window move the mouse pointer into the relevant window and click the right mouse button At the top right of the workspace there is a new toolbar with the following buttons that always relate to the active group window Scale Up AY Scale Down E Decrease Channels Increase Channels Next Group Previous Group and Baseline Correction in Display l Their functions are the same as those of the main toolbar Note that you have to press Ctrl Shift rather than lt Ctrl gt to use the keyboard shortcuts You can find detailed information on changing the scaling the number of channels and 8 channel groups displayed in section 5 2 The Recorder interface BRAINVISION RECORDER 6 4 11 6 4 Segmentation and averaging Functional description RECORDING AND SAVING DATA 6 4 12 To start recording click the Start Resume Recording a button in the toolbar The Save Data dialog box opens This allows you to overwrite the parameters originally specified for the raw data and for every group The Comment field allows you to enter a comment This comment is saved in the EEG file A filename is proposed which you can either accept or change Then click Save gt Save Data Cancel Base File Name Brain mp_0004 File name C Vision Raw Files Browse BrainAmp_0004 eeg c Avagi Browse BrainAmp_0004 Avg1 avg C Vision Raw Files Browse BrainAmp_
4. National Instruments NI 6071e A D converter board 8 5 Edit Workspace Amplifier Settings Device Settings Master Se Input Mode Honeref Single ended Differential Honeret Single ended R Number of cha Ref Single ended Use lndi T Sa Day O Sf Un Enn l FIGURE 8 27 SELECTING THE INPUT MODE Please refer to chapter 4 pages 4 13 ff of the document PCI E Series User Manual pdf on the BrainVision CD for information about optimum wiring of the amplifier used You can also specify the Number of Channels the Sampling Rate and the Input Polarity The maximum sampling rate depends on the number of channels With up to 16 channels you can sample at 2048 Hz with 32 channels at 1024 Hz and with 64 channels at up to 512 Hz The input polarity indicates whether the EEG amplifier supplies a symmetrical or asymmetrical output signal The A D Range drop down list allows you to specify the recording level range of your amplifier Enter the amplification factor of your EEG amplifier in the Gain field If you do not know the gain you can determine it empirically To do this you require a calibration signal which is fed into the amplifier Choose a realistic gain e g 1000 and then record a short data sequence Measure the values in the analysis software You can now correct the gain by comparing the actual value with what it should be Set the gain to 1000 and feed in a test voltage of 100uV The voltage m
5. RAIN PRODUCTS for neurophysiological research Hl Solutions BrainVision Recorder 1 10 User Manual Version 004 24 September 2008 CEs Imprint BrainVision Recorder 2008 Brain Products GmbH User Manual version 004 Any trademarks mentioned in this User Manual are the protected property of their rightful owners All rights reserved including the right to translate the document The content of this User Manual is the intellectual property of Brain Products GmbH No part of this User 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 Contents Contents 5 1 5 2 5 3 5 3 1 5 3 2 5 3 3 5 3 4 6 1 6 2 6 2 1 6 2 2 6 2 3 6 3 6 4 6 4 1 6 4 2 7 1 72 About this manual Symbols used in the text Intended Use Information on the software Product identification CE mark Application environment Preface Installation Familiarization and operation First steps The Recorder interface Setting up a workspace Settings for files and folders Amplifier specific settings Description using the BrainAmp as an example Software filters Segmentation and averaging Functional description Impedance measurement Functions for viewing and recording data Entering comments Blocking channels DC offset correction Montages Segmentation and avera
6. item Digital Port Settings File View Display Montage Amplifier Configuration Window Help om gt ul a rc He 41 al FIGURE 8 19 AMPLIFIER MENU FOR V AMP FIRSTAMP AMPLIFIERS If you have installed a BrainVision Recorder Professional Edition please note the following a The driver and an additional Windows service must be installed in addition to the Recorder software To do this insert the installation CD in your CD ROM drive and use the Browse the CD function to go to the folder FirstAmp V Amp Run the file with the name FirstAmpACC xxx exe Make sure that no amplifieris connected during installation As of Version 1 10 of the Recorder the V Amp and FirstAmp are also supported in non a Administrator mode i e user mode 8 3 1 Adapting sensors for the auxiliary AUX inputs If you wish to use external sensors to measure temperature skin conductivity etc connect the sensors to the AUX1 or AUX2 ports of the amplifier and make the appropriate changes in the Amplifier menu of the V Amp FirstAmp To set the parameters for the sensors choose File gt Edit Workspace from the menu Go to the page Edit Workspace Amplifier Settings BRAINVISION RECORDER 8 3 1 8 3 V Amp and FirstAmp Amplifier specific properties 8 3 2 Amplifier with 16 2 channels found m Channels Rate Highspeed Mode max 20 kHz Number of Channels max 18 m Sampl
7. 10 0 ms 5 0 ms 2 5 ms 2 5 ms 0 5 ms 0 5 MS 0 5 ms BRAINVISION RECORDER Amplifier specific properties Simulated Amplifier 8 4 8 4 Simulated Amplifier The Simulated Amplifier function allows you to use the BrainVision Recorder without having an EEG amplifier connected and to display an EEG that has already been recorded It simulates the activity of up to 256 channels The menu bar does not contain the Amplifier item if you use the Simulated Amplifier function B Choose Configuration gt Select Amplifier from the menu to select the Simulated Amplifier The File menu allows you to make amplifier specific settings in the same way as with real EEG amplifiers Choose File gt Edit Workspace from the menu to open the Edit Workspace Amplifier Settings dialog box Edit Workspace Amplifier Setti Options Channels Sinewave C EEG EEG Filename m Common Settings Number of Channels 32 Sampling Rate Hz y 500 FIGURE 8 22 EDITING A WORKSPACE PAGE 2 AMPLIFIER SETTINGS FOR THE SIMULATED AMPLIFIER BRAINVISION RECORDER 8 4 1 8 4 Simulated Amplifier Amplifier specific properties 8 4 2 The Sinewave and EEG options are available e f you choose Sinewave and enter suitable values under Common Settings and Channels and in the subsequent menus on the pages Edit Workspace Software
8. 2008 5 52 PM SETT Simulated nwksp 23 2008 3 32 PM RWE w Standard Workspace Ly test_250 Avg mont test_255 mont test_256 rwksp we Es Disk F IEEE 2 dlated rwksp Date modified 7 25 200 SP File Size 500 KBF Date created 1 25 2408 FIGURE 8 24 DO NOT UNDER ANY CIRCUMSTANCES CHANGE THE PROPERTIES OF THE SIMULATED WORKSPACE BRAINVISION RECORDER 8 4 3 Amplifier specific properties National Instruments NI 6071e A D converter board 8 5 8 5 National Instruments NI 6071e A D converter board Note that the A D converter board is NOT supported under Windows Vista RESTRICTIONS TO USE You can also enable EEG analog amplifiers to be connected to the BrainVision Recorder using the A D converter board from National Instruments The board converts the analog signals of the amplifier into digital signals The Recorder treats the card just like an amplifier Ensure that the EEG amplifier used guarantees the prescribed electrical patient isolation at the AN analog outputs Note that the A D converter board does not provide any electrical isolation between the inputs and the PC If analog amplifiers are used there is no facility for measuring impedance or for injecting an internal test signal Please refer to the documents PCI E Series User Manual pdf and SCB 100 100 Pin Connector a Block Installation Guide pdf in the subfolder Nl6071e of the Br
9. 8 2 Digital Port Settings Bits are f High Active f Low Active of Mm Trigger A SEY high low Cancel FIGURE 8 18 SETTING THE DIGITAL PORT FOR THE QUICKAMP USB You can choose whether the signals are interpreted as high active 5 V active or low active o V active In the Enabled column of the table you can specify whether the associated bit is to be evaluated or not In the Type column you can specify what time marker type each bit represents It is also possible to assign the same type to several different bits In principle you can freely select the name of the type You should however note that a BrainVision Recorder and BrainVision Analyzer use color coding for certain types For this reason itis advisable to choose Stimulus and Response for stimulus and response inputs respectively The description of the markers is encoded automatically The following procedure is used The first occurrence of the type in the table is weighted with value 1 the second occurrence with value 2 the third with value 4 etc For every data point all set bits of a type are added together according to this pattern The resultant number is combined with the initial letter of the type resulting in the description Bit 4 through bit 7 are of the type Response If bits 5 and 7 are set this results in a marker of EXAMPLE the type Response with the description R 10 Bit 5 has a value of 2 a
10. Analyzer Macro use Wait 5 Rec Acquisition StopRecording Rec Acquisition StopViewing Rec Quit In this example the Recorder is started data is displayed and an EEG file named TestData EEG with a length of 5 seconds 5 000 milliseconds is stored If you are using the BrainVision Analyzer EEG analysis software you can also control the Recorder by means of an Analyzer macro The macro looks like this TestRecorder Sub Main Create recorder object Set Rec CreateObject VisionRecorder Application Rec Acquisition ViewData Rec Acquisition StartRecording Rec CurrentWorkspace RawFileFolder amp TestData eeg Wait 5 Rec Acquisition StopRecording ct ct Rec Acquisi Rec Quit End Sub ion StopViewing BRAINVISION RECORDER 9 1 9 OLE Automation In this chapter we will not deal with programming in depth but will just outline the Recorder s object model Application CurrentWorkspace FIGURE 9 1 RECORDER OBJECT HIERARCHY The objects are described in Visual Basic notation in the following sections Q 2 BRAINVISION RECORDER 9 1 Application Description The Application object represents the program as a whole It is the default object which means that the methods and properties of this object can be addressed directly i e Version corresponds to Application Version for example Methods Sub Quit Terminates the program Properties Acq
11. BrainAmp MR You make the settings for the digital port by choosing Amplifier gt Digital Port Settings Digital Port Settings Bits are f High Active C Low Active CEC of M Tisser o E aj ET s mM Response 6 m Response 8 mM Response Current State cana FIGURE 8 21 SETTING THE DIGITAL PORT FOR THE V AMP AND FIRSTAMP You can choose whether the signals are interpreted as high active 5 V active or low active o V active In the Enabled column of the table you can specify whether the associated bit is to be evaluated or not In the Type column you can specify what time marker type each bit represents It is also possible to assign the same type to several different bits In principle you can freely select the name of the type You should however note that BrainVision Recorder and BrainVision Analyzer use color coding for certain types For this reason it is advisable to choose Stimulus and Response for stimulus and response inputs respectively BRAINVISION RECORDER 8 3 3 8 3 V Amp and FirstAmp Amplifier specific properties EXAMPLE 8 3 4 The description of the markers is encoded automatically The following procedure is used The first occurrence of the type in the table is weighted with value 1 the second occurrence with value 2 the third with value 4 etc For every data point all set bits of a type are added together according to this pattern The resultant
12. From the task bar choose Start gt Run and click Browse e Navigate to your CD ROM drive and double click the file setup exe and follow the instructions in the program BRAINVISION RECORDER 4 1 4 Installation WINDOWS VISTA If your PC is not set up to autostart CD ROMs proceed as follows under Windows Vista Open the CD ROM drive in Windows Explorer and in the folder Brain Vision CD double click the file Autorun exe and run it with Administrator permissions t Computer DVD RW Drive E bvrwl10 Name Lo Recorder de RecorderDrivers y RecorderNewModules Je RecorderWorkspace Je RecView w de RecViewNewModules rive Es de Sound 3 VideoCodec 2 Newh VideoRecorder 2 Soluti il Autorun exe Educatic 2 Autorun Open ents changes W Run as administrator ta A Send To torun exe Date modified olication Size Cut Date created Copy Create Shortcut Delete Rename Properties FIGURE 4 1 INSTALLING THE RECORDER UNDER WINDOWS VISTA BRAINVISION RECORDER When you run the installation file the Brain Vision Setup CD ROM dialog box opens Welcome to BrainVision Installation DP rann proucrs Welcome to BrainVision Installation What would you like to do Install BrainVisi alyzer 2 Product Manuals QU Install BrainVision recorde Demo Data all BrainVision Rec View Install further Components Install BrainVision Video Recorder Browse the
13. RECORDER APPENDIX 1 Appendix EEG file format Comment Number of channels 48 Sampling Rate Hz 200 Sampling Interval uS 5000 Channels Name Phys Resolution Low High Notch Gradient Offset Chn Unit Cutoff s Cutoff Hz Hz i 0 1 pv DC 250 Off 2 0 1 uV DC 250 Off 41 41 41 0 1526 C DC 250 Off 1 mV C 0 02 mV CLE 42 42 42 0 0763 mm DC 251 Off 2 mV mm O mV O mm 43 43 43 0 1526 mm DC 252 Off 1 mV mm 1 mV O mm 44 44 44 152 6 uV DC 253 Off Low Cutoff s High Cutoff Hz Notch Hz J 0 0006366 Off Off 2 0 0006366 off off 41 0 0006366 Off Off 42 0 0006366 Off Off 43 0 0006366 Off Off 44 0 0006366 Off Off Impedance kOhm at 12 10 43 de Out of Range 2i Out of Range 41 Out of Range 42 Out of Range 43 Out of Range 44 Out of Range Ref Out of Range Gnd Out of Range The first line identifies the header file and is mandatory A semicolon at the beginning of a line identifies a free text comment This line is ignored Blank lines are also ignored A section is introduced by a line with a term enclosed in square brackets The header extract above for example contains the Common Infos section A header file can contain any number of sections APPENDIX 2 BRAINVISION RECORDER Appendix EEG file format The subsequent lines contain some keywords for this section and the values that have been assigned to them A keyword can only occur once i
14. The third section shows the name of the currently open EEG file o Elapsed Time 00 00 20 The fourth section shows the elapsed recording time of the currently open EEG file o Free space 801 08 59 The fifth section shows the amount of free hard disk space in hours This information is only available when an EEG file is open oe Buffer 1 The sixth section shows the utilization of the internal data buffer as a percentage MESS V ys you are using an amplifier from the BrainAmp family the following section shows a battery symbol indicating the battery voltage of the connected EEG amplifier The charge level of the battery is indicated by the color green yellow red If the battery is shown in red you should replace it BrainCap32 workspace The final section of the status bar contains the name of the current workspace The left hand pane Monitoring window contains recorded raw EEG data or shows a dynamic display of the raw data The right hand view contains the segmentation or average groups You can use the tabs to switch between the individual groups He View Onpley Mortage Ampiter Configuraton Window help e olw ol alal Vl l slvial 4 fi WAAN m na V rpi A New Aw A MASIVA An al NW ta adini V S Y A AA TA TUS ata A AAAA ARA Fe AN A T Mm 4 Li 200 p V LY aan N AAA Man AAR Mas AA F3 an VV RER AAAY Y vn VU e NW A Y f
15. available in the dialog box for amplifiers of the BrainAmp family At the top of the dialog box click the Scan for Amplifiers SELECTING AN AMPLIFIER mn Channels Ampliar 1 Brain imp Standard lAmpliier 2 Not Found 3 Number of Ampliber 3 Not Found Amplifier 4 Not Found Ampliher 5 Not Found Master Seti FIGURE 5 12 SELECTING AN AMPLIFIER FROM THE BRAINAMP FAMILY BRAINVISION RECORDER ggg 5 3 Setting up a workspace Familiarization and operation CHANNELS RATE GROUP BOX MASTER SETTINGS GROUP BOX INSERTING AND REMOVING CHANNELS 5 3 4 Enter the number of channels in the Number of Channels field Choose the sampling rate in the Sampling Rate Hz field Choose the amplitude resolution from the Resolution pV field The value in the Range mV field specifies the range across which the amplifier sends data to the recorder Specify the high and low cutoff filters in the Low Cutoff s and High Cutoff Hz fields The Low Impedance 10 MOhm for DC MRplus check box allows you to switch the input impedance from above 100 MQ to 10 MQ if you are using a BrainAmp DC or BrainAmp MR plus Note that the parameters and the permitted ranges listed above depend on the EEG amplifier you have selected If your amplifier permits individuals settings to be made for each channel you can check the Use Individual Settings box T
16. checking or unchecking the Use Individual Settings box You can also deactivate the paths completely by unchecking the Enable Filters for each path Because the filters are software filters you can enter any values Nevertheless you should take care not to set any frequencies with a value equal to or greater than half the selected sampling rate Edit Workspace Software Filters i JE e Raw Data Saving Filters Segmentation Fiters Display Fitters Master Settings IV Low Cutoff Filter vw High Cutoff Filter Time Constant s 0 3 Frequency Hz 0 531 Frequency Hz 70 Use Individual Settings E Low Cutof High cutoh Notch Channel Enable TimeConstant s Frequency Hz Enable Frequency Hz Enable Frequency Hz 0 3 0 531 70 i 50 iv 70 aa aa WA KUKURRUKU lt lt aaa al lt 9 Aaa aa NN ST 2514 WVU VY yy a a aaa aa aa A FIGURE 5 14 SETTING THE SOFTWARE FILTERS Click the Next button in the Display Filters tab to proceed to the Segmentation Averaging page BRAINVISION RECORDER Familiarization and operation Setting up a workspace 5 3 5 3 4 Segmentation and averaging The Edit Workspace Segmentation Averaging dialog box allows you to make optional settings for segmentation and averaging The various options available for these set
17. critical threshold Do this by choosing Configuration gt Preferences and in the DC Correction tab checking the Automatic DC Correction box and entering the required threshold Threshold 70 FIGURE 6 9 SETTING AUTOMATIC DC CORRECTION BRAINVISION RECORDER Functional description Montages 6 3 6 3 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 combining frontal electrodes in one montage and occipital electrodes in another one In this case when a montage is selected only those channels which have been assigned to it are displayed The sequence of channels can also be changed in a montage 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 saved To create a new montage choose Display Montage gt New The New Montage dialog box opens This dialog box is used for determining the type of reference to be used in the new montage New Montage Choose Reference Cancel f Average C Bipolar E _ _ E FIGURE 6 10 CREATING A MONTAGE You can choose between three reference types Original Average and Bipolar e Original No new reference is calculated This type of
18. in r Workdiles E Name Date modif Type Size 1128 _EEG nwksp _ BrainCap32 nvksp __ Simulated nvksp __ Standard Workspace rwksp test_256 nwks i zii Type RWKSP File Size 5 00 KB Date modified 7 25 2008 5 52 PM FIGURE 5 9 OPENING AN EXISTING WORKSPACE BRAINVISION RECORDER 5 3 1 5 3 Setting up a workspace Familiarization and operation Es paa If you wish to modify a workspace choose File gt Edit Workspace The Edit Workspace Data Files Settings dialog box appears The following descriptions also apply if you select File gt New Workspace Edit Workspace Data Files Settings Raw File Folder C Vision Raw Files if Automatic Filename Generation Min Counter Size digits la Curent Number 1 Next Resulting Filename FIGURE 5 10 EDITING A WORKSPACE PAGE 1 DATA FILES SETTINGS The Raw File Folder field is used to specify where the raw EEG data is stored You can select the folder by clicking the Browse button If you check Automatic Filename Generation the name of the raw data set is generated automatically on the basis of a Prefix to which a sequential number Current Number is appended The file for the first recording could therefore be BrainAmp_ooo1 eeg in which case the name of the second file would be BrainAmp_0002 eeg The Min Counter Size digits field specifies the minimum number of digits that appear in the name of the data set The number
19. number is combined with the initial letter of the type resulting in the description Bit 4 through bit 7 are of the type Response2 If bits 5 and 7 are set this results in a marker of the type Response with the description R 10 Bit 5 has a value of 2 and bit 7 a value of 8 The total is 10 The consequence of this logic is that only markers of different types can be detected at any one time If you want to record different responses simultaneously you can do so by decoding the number values subsequently in the analysis i e assigning a separate marker to every bit Alternately you can assign a separate type to every bit in the table You can view the current state of the digital port for test purposes in the Current State field Another option available in the Digital Port Settings dialog box is debouncing If you check the Enable Debouncing in Millisecond 5 50 ms box repetition of a marker of the same type and same description is ignored for a period of 5 through 50 ms Note that a suitable ratio between the length of the trigger signal and the sampling frequency is required to ensure that the TTL trigger signals are recorded without errors you make the appropriate settings when you set up the workspace The following table contains the recommended minimum length of the trigger signal for various sampling rates Shorter signal lengths can result in errored markers Sampling rate Minimum length of trigger signal
20. oe e FREELY DEFINABLE TEXT You enter a freely definable text by clicking the Annotation button You can also use the keyboard shortcut lt Ctrl A gt The Annotation dialog box opens and a marker with three question marks is added to the lower market area Enter your text in the dialog box This then replaces the question marks in the marker Annotation Enter Text FIGURE 6 6 DIALOG BOX FOR ENTERING FREELY DEFINABLE TEXT You also have the option of pre defining various texts To use this option close monitoring PREDEFINED TEXT mode and choose Configuration gt Predefined Annotations This opens the Predefined Annotations dialog box In this dialog box you can enter up to ten predefined texts The predefined texts are displayed in the lower market area if you press the corresponding keys 13 through lt 0 gt in monitoring mode If this menu command is not available the probable reason is that you do not have a Administrator privileges For further information refer to section 7 1 Configuring the userr privileges or contact your system administrator BRAINVISION RECORDER 6 2 1 6 2 Functions for viewing and recording data Functional description Text for Annotation Shortcuts Rey Associated Annotation IH yperventilatior IE pes opened E pes opened l 2 J 4 5 E fi g 0 FIGURE 6 7 DIALOG BOX FOR ENTERING PREDEFINED TEXT 6 2 2 BRAINVISION RECORDER Functional descr
21. scaling factors to each channel For further information see section 7 2 W Down decreases the scale sensitivity alternatively use the keyboard shortcut lt Ctrl gt e Decrease Channels decreases the number of channels displayed Increase Channels increases the number of channels displayed 5 2 2 BRAINVISION RECORDER Familiarization and operation The Recorder interface 5 2 FARB Group switches to the next channel group This function is only available if you have already reduced the number of channels A Previous Group switches to the previous channel group This function is only available if you have already reduced the number of channels EA Baseline Correction in Display activates or deactivates baseline correction When activated only the baseline of the representation is shown and not the actual data E annotation allows you to enter a free text alternatively use the keyboard shortcut lt Ctrl A D I DC Correction activates or deactivates DC offset correction for the DC amplifier alternatively use the keyboard shortcut lt Ctrl D gt DC offset correction acts directly on the data The DC Correction button only appears in the toolbar if you are using a B BrainAmp DC BrainAmp MR plus or BrainAmp ExG ox Display Filter activates or deactivates the filters You can toggle this button during monitoring or recording e The preset value for this
22. site http www brainproducts com Email techsup brainproducts com Classification according to EU Directive 93 42 EEC MDD Annex IX Rule 12 Class with measuring function Classification according to DIN EN Class A No injury or damage to health is 62304 possible UMDNS number 12 389 Acquisition Software for EEGs and Evoked Potentials GMND code 36163 Approved EEG amplifiers BrainAmp Standard BrainAmp DC BrainAmp MR BrainAmp MR plus BrainAmp ExG BrainAmp ExG MR QuickAmp FirstAmp V Amp Other approved hardware National Instruments NI 6071e A D converter board BRAINVISION RECORDER 2 1 2 Information on the software 2 2 CE mark 0535 C The CE mark confirms that the product fulfills all the basic requirements stipulated in the Medical Devices Directive 93 42 EEC MDD Annex 0535 is the identification number of the Notified Body who issued the approval 2 3 Application environment The BrainVision Recorder is approved as an applied part in the patient environment provided that the PC on which the recorder is running is a PC approved for medical applications in accordance with IEC 60601 1 If however you run the Recorder on a PC which is not approved in accordance with IEC 60601 1 this PC must be located and used outside the patient environment If you record EEG ExG signals in an MRI scanner the PC must always be used outside the MRI scanner room BRAINVISION RECORDER 3 Preface The
23. swatch 6 1 2 BRAINVISION RECORDER Functional description Impedance measurement 6 1 If you are using a large number of electrodes you can use the slider control in the Zoom group box to select the region of the head to be shown The red square in the electrode view below defines the region shown in the main view You can also move the square using the mouse Clicking the Settings button opens the Impedance Check Settings dialog box Here you can define your own measurement ranges the colors used the color steps and an optional background bitmap Impedance Check Settings Ranges Electrodes Group Data Cancel __ Enabled Min kOhm Max kOhm Impedance Color Coding f Green Yellow Red Blue Cyan Green Yellow Red Black amp White Discrete Color Steps 16 Electrode Label Select Font Reset Font Background Image W Lee Bitmap Mame Browse FIGURE 6 3 SETTING THE MEASUREMENT RANGES AND COLORS 6 1 Impedance measurement Functional description RANGES GROUP BOX IMPEDANCE COLOR CODING GROUP BOX ELECTRODE LABEL GROUP BOX 6 1 4 For each electrode group you can select up to ten measurement ranges in the Ranges group The Impedance Color Coding group box allows you to define the color coding You can choose between A color gradient from green through yellow to red A color gradient from blue through turquoise green and yel
24. 0004 Avg2 avg FIGURE 6 30 DIALOG BOX FOR SAVING DATA As in the normal Save dialog box See section 6 2 Functions for viewing and recording data you can enter a comment here Comment You can also specify e whether the raw data and the various groups are to be saved Save button e what folder the data is to be saved in Folder column Browse button e thename of the file File name column The Base File Name field is used to enter a base name for the raw file The n placeholders described in section 6 4 1 Save Data group box are changed accordingly in the filename fields of the segmentation or averaging groups BRAINVISION RECORDER Functional description Segmentation and averaging 6 4 When you click Save the Recorder switches to Save mode The status fields in the individual groups now show the number of segments Total Segs and the number of accepted segments Accepted Segs in addition to the group status and the current montage In addition the EEG file name is shown and the remaining storage space in hours minutes and seconds is shown under Free Space Note that this refers to the capacity that would be available if only the relevant group were stored A Mi Ny i IH MN Total Segs 2 Brain4mp_0008 Awg1 standard Montage Accepted Segs 2 Free Space 400 34 29 t 54 4 Standard Montage Braindmp_0008 eeq Ela
25. BrainVision Recorder is a powerful and flexible recording program Its particular strengths lie in the following features The program is structured in such a way that it is possible to control different amplifiers The number of channels is restricted only by the EEG amplifier that is being used In itself the internal structure of the BrainVision Recorder allows you to work with an unlimited number of channels The fact that OLE automation has been implemented allows you to control the BrainVision Recorder remotely and monitor its internal status using other programs The Remote Data Access RDA method allows the user to acquire and record the digital signals with their own programs while the EEG is being displayed This method can be used across different computers Possible applications for RDA include bio feedback and signal quality analysis Optional segmentation on the basis of event markers reduces the storage space required for EEG files The optional averaging function on the basis of event markers allows evoked potentials to be generated during recording The data acquired can be filtered separately for representation segmentation averaging and storage BRAINVISION RECORDER Preface 3 Installation 4 4 Installation Under normal conditions the BrainVision Recorder does not impact on any programs already installed Brain Products GmbH however only guarantees that programs will interact without problems if the
26. BrainVision Recorder with version number 1 02 0001 or higher must have been previously installed As of version 1 03 of the Recorder you also install the Brain Products license file you received with the product Make sure that you have a USB dongle with video option Check this by starting the Recorder a and choosing Help gt About Recorder About Vision Recorder L NN ei es Brain Wisin Recorder Yersion 1 10 0001 y Copyright 2000 2008 Brain Products GmbH System Info Hardlock S N 696 Analizer Recorder combined dongle Sublicens ez Vision Video L FIGURE 11 1 PROGRAM INFORMATION If you have the appropriate USB dongle the line Vision Video will appear To install the Video Recorder run the Setup program on the CD supplied and follow the installation instructions Now install the codec supplied A codec is used to compress the video data Connect the video camera and switch it on Note that some video cameras with a video tape inserted switch over to standby mode after a a set time Since we store the data directly in the computer no video tape is required BRAINVISION RECORDER 11 1 11 BrainVision Video Recorder 11 2 Configuration To configure the Video Recorder choose Configuration gt Preferences in the Recorder If you have installed the Video Recorder correctly and you have a dongle with a video license the Preferences dialog box will contain an additional tab named Vision Vid
27. CD Register your Product online TA BRAIN ISION BRAIN ISION BRAIN ISION ANALYZER RECORDER RECVIEW Copyright Brain Products GmbH Zeppelinstrasse 7 82205 Gilching Germany FIGURE 4 2 SETUP DIALOG BOX UNDER WINDOWS VISTA Click the button Install Brain Vision Recorder and follow the instructions in the program BRAINVISION RECORDER Installation 4 4 Installation During the installation procedure you must agree to installation of the driver software in the Windows Security dialog box by clicking the entry Install this driver software anyway Windows Security kE Windows can t verify the publisher of this driver software You should check you i giurer s website for updated driver software for your FREE gt Don t install tho in are Ht Install this driver software anyway Only install driver software obtained from your ma nufacturer s website or disc Unsigned software from other sources may harm ya information we See details FIGURE 4 3 ACCEPTING INSTALLATION OF THE DRIVER SOFTWARE Connect the supplied USB dongle to one of the USB ports of your PC before you start the recorder En Start the Recorder by double clicking the Recorder shortcut amp which you will find on your desktop after installation has been completed successfully Alternatively you can call the Recorder from the task bar by choosing Start gt Vision Recorder BRAINVISION RECORDER Familiariza
28. DA_Marker type consists of the following e nSize the size of the marker in bytes e nPosition the relative position in the data block in sampling points o e nPoints the number of points covered by this marker mostly 1 e nChannel the channel number to which this marker has been assigned at present only all markers e sTypeDesc type and description of the marker as null terminated text You will find examples of how to handle data and markers in RDAClient cpp in the routines WriteDataBlock RDA_MessageData pMsg and WriteMarkers RDA_MessageData pMsg ULONG nOffset ULONG nExistingMarkers RDA_MessageStop nType 3 This message consists of the header only and indicates the end of monitoring RDA_MessageData32 nType 4 This message is only received by clients that have logged in via port number 51244 Its structure is identical to that of RDA_MessageData with the exception of the fData field which replaces the nData field fData is the current data in the 32 bit IEEE floating point format The number of values is derived from nPoints and RDA_MessageStart nChannels BRAINVISION RECORDER 10 3 BrainVision Video Recorder 11 11 BrainVision Video Recorder The Brain Vision Video Recorder or simply Video Recorder for short is used for the synchronous recording of video data and EEG data in conjunction with the BrainVision Recorder 11 1 Installation In order to use the Video Recorder
29. Filters and Edit Workspace Segmentation Averaging sine waves are displayed during monitoring The sine waves vary from channel to channel Operation is the same as if an amplifier were physically present e If you choose EEG and then click the MA button a dialog box appears allowing you to open a saved EEG data set When you close the dialog box and click the Monitor el auton the EEG data set is displayed The EEG data is displayed in the same way as with a real amplifier The EEG data set is repeated in a loop When you select the Simulated Amplifier a separate workspace the simulated workspace is created and the parameters are taken from the most recent workspace based on a real amplifier If you then edit this simulated workspace you can make changes without overwriting the original workspace based on BrainAmp QuickAmp USB QuickAmp PCI V Amp FirstAmp converter board If you then select a real amplifier again the most recent non simulated workspace is then automatically reloaded without changes BRAINVISION RECORDER Amplifier specific properties Simulated Amplifier 8 4 The properties of the simulated workspace right click on the file gt Properties must not be changed under any circumstances Name Date modified Type 128_EEG mont 10 5 2007 547 PM MON 1128 EEG rwksp 3 30 2008 2 00 PM RWK BrainCap3 rwksp 2 13 2001 4 50PM RWE Recorder Setting 7 25
30. G file format The current version of the BrainVision Recorder supports the BrainVision Data Exchange Format only This format is described below An EEG consists of three files the header file the marker file and the actual data The header file describes the EEG This file is an ASCII file with the extension vhdr It will normally be given the same base name as the raw data EEG that is described in it The header file is stored in the raw data folder of the workspace The format of the header file is based on the Windows INI format It consists of sections with different names containing keyword value pairs Here is an extract from a header file Brain Vision Data Exchange Header File Version 1 0 Data created by the Vision Recorder Common Infos Codepage UTF 8 DataFile 000007 eeg MarkerFile 000007 vmrk DataFormat BINARY Data orientation MULTIPLEXED ch1 pt1 ch2 ptl DataOrientation MULTIPLEXED NumberOfChannels 48 Sampling interval in microseconds SamplingInterval 5000 Binary Infos BinaryFormat 1NT 16 Channel Infos Each entry Ch lt Channel number gt lt Name gt lt Reference channel name gt lt Resolution in Unit gt lt Unit gt Future extensions Fields are delimited by commas some fields might be omitted empty Commas in channel names are coded as 11 Ch1 1 0 1 uV Ch2 2 0 1 uV Ch41 41 0 1526 C Ch42 42 0 0763 mm Ch43 43 0 1526 mm Ch44 44 152 6 uV BRAINVISION
31. If you have Administrator privileges or the Administrator has not restricted the privileges of normal users See also section 7 1 you can set various preferences To do this stop monitoring and choose Configuration gt Preferences from the menu bar The dialog box which opens contains the four tabs Scaling DC Correction Remote Data Access and Vision Video The Scaling tab contains the following functions SCALING TAB Preferences scaling DC Correction Remote Data Access Vision Video w Start with Display Baseline On Default Scaling pV 1100 Set Individual Scaling Factors FIGURE 7 3 SETTING THE SCALING PREFERENCES The Polarity Positive Down function defines the polarity of the displayed signal If this option is enabled positive signals are shown facing down If you check the Start with Display Baseline On box baseline correction in the EEG display is enabled by default The Default Scaling pV field contains the scaling value to be used when monitoring starts The Set Individual Scaling Factors function allows you to specify the channels you want to display on a reduced scale This is for example desirable for ECG channels as they would otherwise extend far into the signals of EEG channels In the table enter the channel names and the associated scaling factors by which you want to reduce the scale of the signals This reduction applies to the display only and not to the data BRAINVISI
32. MR amplifier or if you are using an electrode cap for derivation that is fitted with resistors e g MRI caps BrainCap MR and bipolar electrodes used in MRI scanners The series resistances are saved in the workspace These resistance values are subtracted from the measured impedances during impedance measurement so that only the impedance between the skin and the electrodes is shown in the Impedance Check view and saved in the header For all amplifier families except the Simulated Amplifier you are prompted to save the edited EDIT WORKSPACE ALL workspace after you have finished editing By default the workspace to be saved has the same AMPLIFIERS name as the active workspace If you do not change this name the following warning is issued 22 rwksp already exists Do you want to replace it You can change the name of the workspace or confirm that the workspace is to be replaced If you choose to replace the workspace the old workspace is overwritten 5 3 Setting up a workspace Familiarization and operation 5 3 6 5 3 3 Software filters The Edit Workspace Software Filters dialog box is used to set the filter parameters for the individual software filter paths Three separate filter paths are available e Filtering of the raw data to be saved e Filtering of all data used for segmentation averaging e Filtering of the displayed data You can apply this setting to the channels as a group or to individual channels by
33. ON RECORDER 7 2 1 7 2 Configuring the user settings Program configuration Enter individual channels and their scaling factors in relation to the standard scaling factor This i used to attenuate polygraphic signals like EKG on the display A higher factor results im a smaller signal Only the display is affected FIGURE 7 4 ENTERING SCALING FACTORS DC CORRECTION TAB Check the Automatic DC Correction box to activate automatic DC correction The Threshold field is used to specify the threshold as a percentage at which DC correction is performed For further information on DC correction refer to section 6 2 3 FIGURE 7 5 ENABLING AUTOMATIC DC CORRECTION 7 2 2 BRAINVISION RECORDER Program configuration Configuring the user settings 7 2 Check the Enable Remote Data Access box to enable the RDA server For further information REMOTE DATA refer to chapter 10 Remote Data Access ACCESS TAB FIGURE 7 6 ACTIVATING THE RDA SERVER If you have purchased a video license and have installed the video recorder correctly the VISION VIDEO TAB additional tab Vision Video is available For information on the functions available and how to use the Vision Video option refer to chapter 11 BrainVision Video Recorder FIGURE 7 7 ACTIVATING THE VISION VIDEO FUNCTION Amplifier specific properties BrainAmp family 8 1 8 Amplifier specific properties This chapter contains det
34. Osj h OO 0 Connected Amplifier s QuickAmp Signal Acquisition Device SerialNo 118060007 40 Channels 2 E oa I Number of Channels ad 23 1 R Sampling Rate Hz y 2000 i FIGURE 8 14 EDITING A WORKSPACE PAGE 2 AMPLIFIER SETTINGS FOR THE QUICKAMP PCI USB The AUX channels are always the last four channels of an amplifier If you are using a QuickAmp4o you can thus use physical channels 37 through 40 With a QuickAmp72 use channels 69 through 72 and with a QuickAmp128 channels 125 through 128 8 2 2 BRAINVISION RECORDER Amplifier specific properties QuickAmp PCI and QuickAmp USB 8 2 40 eaux 40 40 nm E 1 ma 0 FIGURE 8 15 QUICKAMP AUX CHANNELS When you have selected the channels in the Phys Chn column additional data entry columns become available in the same way as with the BrainAmp e Diff Unit If you check this box you can use a different unit such as C for Celsius e Unit Specify the unit here e Gradient These columns you to specify the gradient in mV unit with a unit C for example mV C In this example you are describing the voltage difference in mV for a temperature change of one degree Celsius This value can also be negative e Offset The offset defines the zero point In our temperature example this is the voltage in mV that the sensor returns at a temp
35. RAINVISION RECORDER Amplifier specific properties BrainAmp family 8 1 8 1 5 SyncBox The SyncBox is used to synchronize the clock cycle of MR data acquisition by the BrainAmp with the clock cycle used to control the MR system s gradient switching system The aim is to achieve phase synchronicity between the two clock systems This results in a temporary stability of EEG acquisition in terms of the transmission of the gradients during MR acquisition Choose Amplifier gt SyncBox Settings to access the SyncBox settings syncBox Settings if Use SyncBox Scanner Frequency kHz 20000 Update Interval Sync Status Marker 5 Se cone FIGURE 8 10 SETTINGS FOR THE SYNCBOX If you check the Use SyncBox box the associated icon appears in the status bar in both monitoring mode and save mode The green icon indicates that synchronization is on and the red icon indicates that synchronization is off In addition every change to the synchronization status is recorded as a trigger and saved accordingly in save mode Sync On and Sync Off When monitoring mode or save mode is started the current status of the SyncBox is recorded as a trigger Standard Montage FIGURE 8 11 ICON INDICATES THAT THE SYNCBOX IS BEING USED The Scanner Frequency kHz is the frequency of the signal on the gradient board of the MR system that the scanner interface of the SyncBox is connected to Note that this value is specifie
36. Remove Line removes the current line provided that it is not the last line e Insert Current Channels copies all the channels of the current setup into the montage in their original sequence In some cases it may now be quicker to build up the montage you require by removing and inserting individual channels for instance This button becomes available if the montage list is empty e Remove All removes the entire contents of a montage You are prompted to confirm whether you wish this to be done This button becomes available as soon as you have completed an entry e Arrange for Grid Views opens a dialog box in which you can arrange the channels for the grid views Grid views used when representing segmented or averaged data You can either enter the channel names manually or activate the selection menu and select a channel name from the list When you have filled in the first 16 channels you can reach the remaining channels at the bottom of the list by using the scroll bar If the montages are not bipolar the program automatically fills the input fields for the reference channels with suitable names BRAINVISION RECORDER Functional description Montages 6 3 In the grid view used for representing segmented averaged data the channels are arranged in GRID VIEW a grid A preset pattern is used for the default montage For other montages you can use the Arrange for Grid Views function to freely define the pattern You have the op
37. Tr You will find further information on pages 1 and 2 of this dialog box in section 5 3 Setting up a workspace In the Edit Workspace Segmentation Averaging dialog box you will see the terms segmentation group and averaging group A segmentation group describes segmentation based on one or more markers You can define the averaging parameters for each group separately The data for each group is displayed in a separate window during operation and can optionally be stored in separate files You can define a total of up to 16 groups You can make the following settings To begin with activate or deactivate the segmentation averaging option by checking the Enable Segmentation Averaging box The Save Raw Data function allows you to define whether the raw data is to be stored in addition to the segmented averaged data Edit Workspace Segmentation Averaging if Save Raw Data Markers Seaqment Avg Groups Use All M eS gt Tune FIGURE 6 16 ACTIVATING DEACTIVATING SEGMENTATION AVERAGING AND STORAGE OF THE RAW DATA The Edit Workspace Segmentation Averaging dialog box is divided into two functional blocks The left hand block contains the Segment Avg Groups group box which is used to select create rename and delete groups The right hand block contains several group boxes and is used to display the parameters for the selected group BRAINVISION RECORDER Functional description Seg
38. VIEWING DATA 6 4 10 6 4 2 Viewing and recording data If the Recorder is in standard view mode click the Monitor button in the toolbar I File Vien rT Amplifier Configuration Window Help jm olw ul a alal ad ai 5 5 BIOS Fpi en ate ek ae rr ile Fpt a a fw m A os zu f Y F3 whey T no S ea ees O i ky HA A me eee e hati Anruf ee ee i i a WITT ee a a TTM ri ca LITTTIT TTT EMTT TET TI Pi nn rn e ut ee a qu e e fll P4 a A me Pa mia Pete 23 A I a AAAI Un arly di ER YA OT A FT eee A AA AAAA A a aA a i F A a iia aati Tari warns id ce 17 Ae Ca a fe A A I TE A AT nn a Pr fully A PEET PE ODA N del A f P a TEET Y Ez s aan laas A Ll Cy Px FCI l ca lcm cra Ver FCS N FCE l 7 CPS AN cre oe eee Pathan N ER TPs Maaari i W he T1P10 pu Haha anal y Ete O ara Thalia nanny pl Whey ECts1 A i i y Fi ANA ORR iF AAA at Vi It u W tn ee N W BCG I E Reedy Mondonng Handard WScrbage Bullen IR P Brint api werk Spice MO uv FIGURE 6 28 MONITORING WINDOW AND REPRESENTATION OF AVERAGING GROUPS Tee ee Slavia Marlie A Te Aw Moreras TIT Al i Avere The workspace is split into two parts On the left you see the monitoring window and on the right a separate data window for every segmentation or averaging group The data in this window is updated whenever a matching marker is foun
39. Y 0 wi V A ES A AN Av wi la pe ARAN Wavy oy a UN K IM a YN OA WI r a AA Ti i wm J filth Y HIRTA 200 pv a UN A a Mm vi baw 4 ji DA 4 FI T XA X 1 IN M N a CA Y y i p j ig W mw a Y N 7 yl e N f f f P3 j 4 AM m TA V f I ww _ MA i Y 7 NT HR damas A Lani haa AAD A Rew A A pa N ad pp a wy Y WW VI ye Wi vv W W WW Y An Lal 4 a w 1 4 y Y 200 yv V al 1 Ar PARAS AAAA AAR AA AM AR ANAAAA w a NV Lf i yy T FA AM W W vwy 200 pv j k Nh VW aA Ay o en Ma N AAVA Wye YvYYy 3 V UN 1 A Vas Aaa kl Aran AN A FI Mil A y WV A Wi AAN 7 y a N Ll N A P F8 Y No N why vv my rr N al Y MAMA AAR AAA Van AVVAAAAAS ALA Nn N A VYY A AL uw y m Y A dana AAA AA Aas Alu ARAA a A A Ta Mi i y f u W N YN y N ve Y AN v y VW WY IS W Y i U La h ah PUPPY IP Oh Barsa M n sana Alla A pr wh ph y Mv VNU Wy vv WN PANA P 3 Y y 7 Ps Decresve number ol duplayed channeh Morton anders Mortage Butler O SW BrsinCapil workigace FIGURE 5 6 RECORDER INTERFACE WITH A TWO PANE VIEW 5 2 4 BRAINVISION RECORDER Familiarization and operation The Recorder interface 5 2 KUN pP Avg Average EE Ava Average Monitoring Buffer 0 FIGURE 5 7 TAB FOR SWITCHING BETWEEN SEGMENTATION OR AVERAGE GROUPS The channel names are shown on the far left of the workspace The percentages shown on the image fo
40. a Not Connected If the display is black the most likely cause is that an incompatible codec has been selected In this case select a different codec You can move and resize the video window using the mouse Now record part of an EEG for example 10 seconds Make sure that the video image does not disappear If you pan with the camera this should also be visible after a short delay of less than a second If not the codec used is not suitable A constant delay of the displayed video data of less than a second is however normal This does not result in any time difference between the video and the EEG when subsequently replayed in the BrainVision Analyzer The video data is saved in the current raw data folder A file with the extension VIDEOCONFIG and the base name of the EEG file contains detailed information about the video names of video files time length etc The actual video data is saved to a file with the extension VISIONVIDEO A new video file is created after every pause in recording It is therefore possible for one EEG file to be associated with several video files You should always check the size of the video files generated A value of 150 to 300 kbytes per second is possible while maintaining good quality If however your video files have a size of several megabytes per second either an unsuitable codec or no codec is selected BRAINVISION RECORDER Appendix EEG file format Appendix EE
41. aging Frame Color Here you can select a frame color for the group in order to identify the associated data window iT LA er ALI 1 Miscellaneous W Limited Number of Segments Max Segments DE Frame Color 7 Select FIGURE 6 26 MISCELLANEOUS GROUP BOX BRAINVISION RECORDER Functional description Segmentation and averaging 6 4 The Save Data group box contains options for saving the group data SAVE DATA GROUP BOX if Allow Manual Rejection with Space Bar Applies to all Groups Frame Color UN Select lif Save Data File Name Prefix n Raw File Name if Use Separate Data Folder n Falder Name c Avg1 Resulting File Name TEE Brain Amp _0001 Avg1 avg FIGURE 6 27 SAVE DATA GROUP BOX If you check the Save Data box the data is stored when you press the Start button in the subsequent data view Enter a file name in the File Name Prefix field You can also use the n placeholder Wherever this placeholder occurs it is replaced by the name of the raw file The group name and a file extension are added to the name that you enter here The name that is formed is shown under Resulting File Name If you do not check the Use Separate Folder box the previously defined raw data folder is used Otherwise you can click Browse to select a separate folder for the group under Folder Name Click Finish when you have completed your settings 6 4 Segmentation and averaging Functional description
42. ailed information on the amplifier specific properties of the following models of EEG amplifier BrainAmp QuickAmp and V Amp FirstAmp and of the options Simulated Amplifier and the NI 6071e A D converter board from National Instruments WU Recorder ow aa a File View Display Montage Configuration Window Help Brain mp Family QuickAmp PC Quick4mp USE Simulated Amplifier Amp First mp FIGURE 8 1 SELECTING THE AMPLIFIER 8 1 BrainAmp family Note that PCI cards are currently NOT supported under Windows Vista You will find detailed information on configuring the amplifier specific parameters in the Edit Workspace Amplifier Settings dialog box in section 5 3 2 If you are using an EEG amplifier from the BrainAmp range the Amplifier menu contains the following items Test Signal Values Digital Port Settings Connected Amplifiers SyncBox Settings and Driver Version File View Display Montage Ampie Configuration Window Help o ul 1 n Joo Test Signal Values Digital Port Settings Connected Amplifiers SyncBox Settings Driver Version FIGURE 8 2 AMPLIFIER MENU FOR AMPLIFIERS FROM THE BRAINAMP RANGE BRAINVISION RECORDER RESTRICTIONS TO USE u 8 1 1 8 1 BrainAmp family Amplifier specific properties 8 1 1 Impedance measurement If you are using a BrainAmp amplifier you should observe the following points in addition to the information given in se
43. ainVision installation CD for further information about the A D converter board If you are using the A D converter board the Amplifier menu contains the items Digital Port a Settings and Driver Version File View Display Montage Configuration Window Help N Digital Port Settings sin FIGURE 8 25 AMPLIFIER MENU FOR THE A D CONVERTER BOARD Driver Version 8 5 1 Installation Do NOT use the CD supplied by National Instruments to install the A D converter board The QS drivers on this CD are not compatible with the BrainVision Recorder Instead use the BrainVision CD which contains the correct drivers Carry out installation as follows e Install the BrainVision Recorder software e Shut your PC down and install the A D converter board in a free PCI slot of the PC e Reboot the PC The New Hardware wizard will prompt you for driver for the new hardware Insert the BrainVision CD in the CD ROM drive and follow the instructions in the setup program BRAINVISION RECORDER 8 5 1 8 5 National Instruments NI 6071e A D converter board Amplifier specific properties 8 5 2 Configuration Choose Configuration gt Select Amplifier gt NI 6071e To set the parameters for the A D converter board choose File gt Edit Workspace and open the page Edit Workspace Amplifier Settings Note that the names of the parameters used reflect the terminology used by National Instrument
44. and Low Activity All these criteria are checked at an interval that you have to define You can also disable individual criteria or all of them in which case they are not used for artifact checking Furthermore you can exclude individual channels from artifact checking This is particularly advisable for ECG channels Note that with the BrainVision Recorder the untested channels are selected and not the tested channels as is the case with the ExG analysis software BrainVision Analyzer BRAINVISION RECORDER Functional description Segmentation and averaging 6 4 To change the settings for artifact checking click Change The Artifact Rejection Criteria dialog box opens _ Artifact Rejection Criteria Gradient Criterion ivf Check Gradient Masimum Allowed Voltage Step Sampling Point p a Amplitude Criterion i Check Masimum and Minimum Amplitude Minimum Allowed Amplitude p 200 Masimum Allowed Amplitude p 200 Test Interval W Test Whole Segment Interval Start mg lo Interval End me lo Difference Criterion Check Maximum Difference of Values in the Segment Low Activity Criterion i Check Low Activity in Intervals Lowest Allowed Activity hax Min 104 Interval Length ma 500 Untested Channels FIGURE 6 24 DIALOG BOX FOR DEFINING MODIFYING THE ARTIFACT CHECKING CRITERIA Check the relevant box to use each of the criteria e Gradient Criterion If the grad
45. arker type each bit represents It is also possible to assign the same type to several different bits Cap In principle you can freely select the name of the type You should however note that BrainVision Recorder and BrainVision Analyzer use color coding for certain types For this reason itis advisable to choose Stimulus and Response for stimulus and response inputs respectively 8 5 4 BRAINVISION RECORDER Amplifier specific properties National Instruments NI 6071e A D converter board 8 5 The description of the markers is encoded automatically The following procedure is used The first occurrence of the type in the table is weighted with value 1 the second occurrence with value 2 the third with value 4 etc For every data point all set bits of a type are added together according to this pattern The resultant number is combined with the initial letter of the type resulting in the description Bit 4 through bit 7 are of the type Response If bits 5 and 7 are set this results in a marker of EXAMPLE the type Response with the description R 10 Bit 5 has a value of 2 and bit 7 a value of 8 The total is 10 The consequence of this logic is that only markers of different types can be detected at any one time If you want to record different responses simultaneously you can do so by decoding the number values subsequently in the analysis i e assigning a separate marker to every bit Alternately y
46. bar are located atthe top ofthe window u Recorder File View Display Montage Amplifier Configuration Window Help ls alul gt uf e alal Ale 8 4fe 2 Jz Fp1 Pp FIGURE 5 5 MENU BAR AND PORTION OF THE TOOLBAR The individual menus have the following functions e The File menu is used to set up and edit a workspace e View is used to show and hide the status bar e Display Montage is used to display and edit the montages e Amplifier contains amplifier specific settings and settings for the test signal e Configuration is used to make default settings for the locations used to archive and store the work files and the data to configure administrative rights and preferences and to select the amplifier used e Window is used to configure the data window e Help provides access to the online Help system for the Recorder The toolbar is located below the menu bar and allows you to make a number of different settings including the time period displayed and the number of channels displayed simultaneously The labels for the elements in the toolbar are displayed when you position the mouse pointer over each element A tool top appears after a few moments The status bar at the bottom of the workspace contains additional brief information on the elements BRAINVISION RECORDER 5 2 1 5 2 The Recorder interface Familiarization and operation The toolbar contains the following elements Monito
47. ction 6 1 Impedance measurement With the BrainAmp there are three groups of electrodes that are measured separately data electrodes one reference electrode and one ground electrode These groups are not completely independent of each other so you should observe the following sequence e First apply the electrodes e Then measure the data electrodes You can choose from five measuring ranges 100 50 20 10 and 5 kOhm Start with the larger range If all electrodes are in a high impedance state check that the reference and ground electrodes are connected firmly e f you want to define other measuring ranges you can do so by clicking Settings in the Zoom group box see Figure 8 3 e Ifthe data electrodes have resistance values that are roughly correct measure the reference electrode Note that there is only a maximum measuring range from o to 10 kOhm e Finally measure the ground electrode For the ground electrode also there is only a maximum measuring range from o to 10 kOhm Electrodes f Data C Reference C Ground Reset Positions Range Ohm 100 f 0 100 f 0 50 60 0 20 f 0 10 f 0 5 a0 Settings Buffer 0 285 5 V BrainCap32 workspace FIGURE 8 3 SETTINGS FOR IMPEDANCE MEASUREMENT 8 1 2 BRAINVISION RECORDER Amplifier specific properties BrainAmp family 8 1 8 1 2 Test signal To display or record a test signal attach the supplied test signal generator to
48. d The curves are shown in red if the segment does not match the artifact criteria This enables you to check the criteria easily prior to recording If you have activated manual artifact rejection see section 6 4 1 when you set the parameters you can now use the space bar during recording to subsequently reject segments which have not automatically been identified as having artifacts You can change the ratio between the Monitor view and the segmentation windows by dragging the split bar between them to the left or right with the mouse However there is a limit both on the left and on the right to prevent an area disappearing completely from the screen There are tabs beneath the group windows These enable you to quickly bring a group window into the foreground BRAINVISION RECORDER Functional description Segmentation and averaging 6 4 a AA mm as 1 rn I I I TP10 EOG ECG er PI y i i PA TUT ATT AA AC Ire W I I Monitoring Standard Montage 51 TE Avg2 Average Avg Average Monitoring standard Montage FIGURE 6 29 TABS FOR VIEWING THE INDIVIDUAL GROUPS You can arrange the group windows in different ways with the buttons below al Cascade Windows arranges all open windows on top of each other mi Tile Windows arranges the windows next to each other Blrie Windows arranges the windows one above the other Right clicking in a data window allows you to select a new montage for this window
49. d in kilohertz kHz This means that the value 20000 in Figure 8 10 represents a 20 MHz input signal at the SyncBox Check or uncheck the Disable Sync Marker box to specify whether or not synchronization markers are to be written during synchronization If you use this function markers are written to the data stream every few seconds indicating the synchronization status i e in sync or out of sync Only check this box if you do not want this to happen The Update Interval Sync Status Marker s allows you to specify the frequency with which these markers are written BRAINVISION RECORDER 8 1 9 8 1 BrainAmp family Amplifier specific properties 8 1 6 Displaying the amplifiers connected Choose Amplifier gt Connected Amplifiers to determine which BrainAmp amplifiers of which type are currently connected to your PC and are ready for operation ErainAmp Standard Not Found Not Found Not Found Not Found Not Found Not Found Not Found FIGURE 8 12 LIST OF CONNECTED AMPLIFIERS 8 1 10 BRAINVISION RECORDER Amplifier specific properties QuickAmp PCI and QuickAmp USB 8 2 8 2 QuickAmp PCI and QuickAmp USB Note that the QuickAmp PCI and QuickAmp USB are NOT compatible with Windows Vista RESTRICTIONS TO USE As of Version 1 10 of the Recorder two types of QuickAmp are distinguished QuickAmp PCI a and QuickAmp USB The QuickAmp PCI i
50. d to in order to ensure that the software is employed as intended and operated correctly It is therefore essential that you read this User Manual in full The current User Manual is intended for specialist staff with experience in performing TARGET GROUP psychophysiological measurements The User Manual contains specific information required for installing and operating the CONTENTS OF THE USER BrainVision Recorder It describes in detail the functions and settings provided by the software MANUAL This User Manual refers to Version 1 10 of the BrainVision Recorder Please report to us any errors or faults that you see or encounter in the present User Manual or REPORTING ERRORS when using the Software In this case please contact Brain Products GmbH Zeppelinstra e 7 D 82205 Gilching Munich Phone 49 8105 73384 O Fax 49 8105 73384 33 Web site http www brainproducts com Email techsup brainproducts com BRAINVISION RECORDER 1 About this manual Symbols used in the text The symbols used in this User Manual have the following meanings A The Warning symbol indicates that incorrect use ofthe devices may result in a health hazard to the user and or a third party Incorrect use means non adherence to the guidelines set out in the current User Manual AN The Stop symbol indicates that you should not carry out a particular action Cay The Note symbol draws your attention to additional information relating to th
51. e the electrodes are arranged at the top right of the workspace r u Recorder o gt 9gb e a el u _ _ _ _ _ _ _ _ _ _________ S Eile View Display Montage Amplifier Configuration Window Help efo w ol ul a el ala AMil lSlwlaf 4 Pfeil AIOE el Electrodes Data C Reference C Ground Reset Positions Range kOhm 0 100 0 50 60 0 20 40 0 10 0 5 Settings Impedance Check E55 V BrainCap32 workspace FIGURE 6 1 IMPEDANCE MEASUREMENT BRAINVISION RECORDER 6 1 1 6 1 Impedance measurement Functional description Electrodes f Data Reference f Ground Reset Positions Range kOhm 100 0 100 80 9 50 60 0 2 m Soi el 20 0 Settings de mr A rm sa mi dm an FIGURE 6 2 DETAILED VIEW OF CONTROLS To change the position of the electrodes left click on an electrode hold the mouse button down and move the electrode with the mouse The Electrodes group box allows you to select different electrode groups for which data is to be determined The groups and their names depend on the amplifier you are using Click the Reset Positions button to reset the electrodes to their initial positions Depending on the amplifier and the selected electrode group you can configure different impedance ranges in the Range kOhm group box The impedances of the electrodes are color coded in accordance with the
52. e current topic 2 BRAINVISION RECORDER 1 Intended Use The BrainVision Recorder is intended for use on humans The BrainVision Recorder is used for controlling EEG amplifiers and for recording EEG and ExG signals e g ECG EOG and EMG signals and sensor data with the aid of electrodes sensors and a personal computer The derived data is stored on the PC as digitized raw data This data can then be further analyzed at a subsequent time and in a different location for instance using the EEG analysis software BrainVision Analyzer Recording of the EEG ExG signals and sensor data is intended for research purposes only This excludes utilization of the software for diagnostic and therapeutic purposes the monitoring of body functions or other medical diagnosis or therapeutic activities The BrainVision Recorder may only used by appropriately trained specialist staff and the specialist staff must be present during use Irrespective of any liability on our part the specialist staff must observe the relevant national stipulations for operators in Germany this is the Medical Devices Act MPG and other relevant directives BRAINVISION RECORDER Intended Use 1 Information on the software 2 2 Information on the software 2 1 Product identification Product designation BrainVision Recorder Manufacturer Brain Products GmbH Zeppelinstra e 7 D 82205 Gilching Munich Phone 49 8105 73384 O Fax 49 8105 73384 33 Web
53. easured in the analysis software is 120 uV for example Correct the gain new value old value 120 uV 100 UV 1200 Now enter the new value and repeat the test The value of the signal feed and the measured value should now match If you require individual settings for each channel check the Use Individual Settings box BRAINVISION RECORDER MASTER SETTINGS GROUP BOX EXAMPLE ee 8 5 National Instruments NI 6071e A D converter board Amplifier specific properties 8 5 3 Configuring the digital port marker port Use the digital ports DIOo through DIO7 for recording time synchronous events such as stimuli or patient responses The designations DIOo through DIO7 relate to the bit number with the first bit being designated with o You make the settings for the digital port by choosing Amplifier gt Digital Port Settings Digital Port Settings y Bits are High Active C Low Active N u a Response JARE 1 Eu EN E Curent State E a a o oa e n E y y E Y high 8 law Enable Debouncing suppresses repetition for 50 ms FIGURE 8 28 DIGITAL PORT SETTINGS FOR THE NATIONAL INSTRUMENTS A D CONVERTER BOARD You can choose whether the signals are interpreted as high active 5 V active or low active o V active In the Enabled column of the table you can specify whether the associated bit is to be evaluated or not In the Type column you can specify what time m
54. ed Name of the workspace file including full path Name As String Write protected Base name of the workspace file without folder and file name extension RawFileFolder Write protected Folder for raw data 9 4 License Description This object describes a license sub license e g a video sub license Methods ir Properties PD As Long Write protected Unique ID of the license Description As String Write protected Description of the license BRAINVISION RECORDER OLE Automation 9 9 OLE Automation 9 5 Licenses Description This object comprises a list of License objects Methods de Properties Count As Long Write protected Number of licenses in the list Item Index As Long As License Default element write protected On specifying the index 1 returns a License object 9 6 Menu Description This object allows manipulation of the menu Methods Sub DisableMenultem Menultem As VisionRecorderMenultem This disables a menu option the option to be disabled is specified in Menultem see below for enumerator types Sub EnableMenultem Menultem As VisionRecorderMenultem This enables a menu option the option to be enabled is specified in Menultem see below for enumerator types Sub Reset This resets all manipulated menu options BRAINVISION RECORDER 9 7 Enumerator types OLE Automation 9 The following sections describe the various enumerator
55. el index Remove is used to remove a channel When you choose this command you are asked to confirm whether you really want to remove the channel The command is not available if the table only contains one channel The table allows you to make the following settings e Enter the channel name in the Name column If you enter the same name twice an error message appears when you click Next at the bottom of the dialog box This considerably facilitates reconfiguration of the workspace The function is not however available for QuickAmp PCI NI 6071e A D converter board and Simulated Amplifier e The Type column specifies the channel type EEG BIP AUX e The Phys Chn column allows you to assign physical channels to the logical channels in the first column provided that your amplifier permits this Assignment of the channels in this way makes sense for instance if you are working with an electrode cap but only wish to work with selected electrodes of the cap e The Resolution pV column contains the signal resolution e The Range mV column contains the range across which the amplifier sends data to the Recorder e The Low Cutoff tc s column allows you to specify the low cutoff filter e The High Cutoff Hz column allows you to specify the high cutoff filter e Inthe Series Resist kOhms column enter the resistance of the protective resistors fitted in the electrode cables These are only required for the BrainAmp
56. eo Scaling DC Correction Remote Data Access Vision Video V Enable Vision Video Vision Video Recorder Settings Vision Video Recorder settings Video Source Audio Source Capture Audio Select Audio Device Video Device Settings po Select Video Input Select Audio Input I oz Select Video Codec LEAD MCMP MJPEG Codec VFW Video Codec Settings W Show Time On Video W Disable Preview Scale FIGURE 11 2 VIDEO SETTINGS AND SELECTING THE CODEC Enable synchronous video recording by checking the Enable Vision Video box Click the Vision Video Recorder Settings button You can make the following settings e Choose the installed video camera under Select Video Device e Video Device Settings allows you to access the settings for the camera e Ifyou have connected analog video devices Select Video Input allows you to select between different input options such as Video Tuner SVideo Composite Cay However we recommend that you use digital video equipment 11 2 BRAINVISION RECORDER BrainVision Video Recorder 11 e You can select a codec by clicking Select Video Codec Note that most codecs offered are not suitable for real time recording so a choose either the codec supplied or one that you know is capable of meeting the requirements Click the Video Codec Settings button to set the optimum balance between image quality and video file size Experiment with different
57. erature of o degrees Celsius 8 2 2 Test signal To display or record a test signal attach the supplied test signal generator to the EEG amplifier via the electrode input socket In the toolbar click the Test Signal am button A square wave signal is generated and displayed Note that the test signal is not calibrated It is only an approximate value a Test Signal Values f 200 pWpp f 500 pVpp FIGURE 8 16 SETTING THE TEST SIGNAL PARAMETERS 8 2 QuickAmp PCI and QuickAmp USB Amplifier specific properties 8 2 3 Configuring the digital port marker port Use the digital ports DIOo through DIO7 for recording time synchronous events such as stimuli or patient responses The designations DIOo through DIO7 relate to the bit number with the first bit being designated with o You make the settings for the digital port by choosing Amplifier gt Digital Port Settings 57 Note that the contents of the dialog box differ in respect of the debouncing parameters with the QuickAmp PCI and QuickAmp USB ol Port Setung gt Bits are High Active Low Active KSS 4 4 15 l6 17 Current State yr 6 54 3 2 1 0 st Y Y amp high low Enable Debouncing suppresses repetition for 50 ms FIGURE 8 17 SETTING THE DIGITAL PORT FOR THE QUICKAMP PCI 8 2 4 BRAINVISION RECORDER Amplifier specific properties QuickAmp PCI and QuickAmp USB
58. es Pulldown Resistors C Low Active Input uses Pullup Resistors 4 pe Stimulus FIGURE 8 6 ADDITIONAL MARKER TYPE DC CORRECTION DURING DC MEASUREMENTS DC correction is automatically performed when this marker is received If several markers of the type DC Correction are set simultaneously correction is only performed once This applies to both USB and PCI ports The description of the markers is encoded automatically The following procedure is used The first occurrence of the type in the table is weighted with value 1 the second occurrence with value 2 the third with value 4 etc For every data point all set bits of a type are added together according to this pattern The resultant number is combined with the initial letter of the type resulting in the description Bit 8 through bit 15 are of the type Response If bits 11 and 13 are set this results in a marker of the type Response with the description R 40 Bit 11 has a value of 8 and bit 13 a value of 32 The total is 4o The consequence of this logic is that only markers of different types can be detected at any one time If you want to record different responses simultaneously you can do so by decoding the number values subsequently in the analysis i e assigning a separate marker to every bit Alternately you can assign a separate type to every bit in the table You can view the current state of the digital port for test purpos
59. es in the Current State field Another option available in the Digital Port Settings dialog box is debouncing If you check the Enable Debouncing in Millisecond 5 50 ms box repetition of a marker of the same type and same description is ignored for a period of 5 through 50 ms Note that trigger signals must be present at least for the extent of a sampling point This means for instance that at a sampling rate of 1000 Hz the minimum length of the trigger signal is 1 ms At 500 Hz the minimum length is 2 ms etc BRAINVISION RECORDER u DDITIONAL MARKER TYPE FOR DC MEASUREMENTS EXAMPLE 8 1 5 8 1 BrainAmp family Amplifier specific properties 8 1 6 8 1 4 ExG AUX Box The ExG AUX Box allows you to connect single electrodes in order to capture bipolar signals and or polygraph sensors on the BrainAmp ExG or the BrainAmp ExG MR If you wish to use sensors to measure temperature skin conductivity etc you can make the appropriate settings in the Amplifier menu of the Vision Recorder To do this choose File gt Edit Workspace To use the ExG AUX Box check the Use ExG AUX box on the Edit Workspace Amplifier Settings page of the dialog box Edit Workspace Amplifier Settings m Channels Rate Number of Channels 16 Master Settings Resolution iv e Flange le mVE 16 384 F Use PolBor LED Copy Master Settings nes Phys 2 Name Type en Resist CEARR mv ei a
60. ew DisplayMontage Configuration Window Help olo lul of ul al of alal alelasivlall 7 2d Simulated Amplifier Y Amp Firskamp FIGURE 5 3 SELECTING THE AMPLIFIER 57 Make sure that you have Administrator privileges If you do not have administrator privileges you cannot access the function for selecting the amplifier The Recorder makes default settings for your EEG amplifier To check that your EEG amplifier is working properly first make sure that the amplifier is connected to your PC correctly and is switched on In the toolbar click the Monitor button To close monitoring mode click the Stop Monitoring e button in the toolbar The program switches to idle mode 5 1 2 BRAINVISION ANALYZER Familiarization and operation First steps 5 1 If no errors are encountered EEG curves appear in the workspace running from left to right mE PCI wz File View Display Montage Configuration Window Help e olw 0 o alal Adelle vl ali 7 ae geet FIGURE 5 4 REPRESENTATION OF EEG CURVES If the message The setup does not match the amplifiers capabilities appears the current amplifier settings are not compatible with the amplifier you have selected To eliminate this problem follows the instructions for setting up a workspace given in section 5 3 BRAINVISIONRECORDER gg Familiarization and operation The Recorder interface 5 2 5 2 The Recorder interface The menu bar and the tool
61. fe lose ns fe in he E 2 F joope 2 os mess 10 3 240 lo E 35 wal m 5 h rare ttait ha a 88 bok tt SS men olaaa eee i E FIGURE 8 7 EXTRACT FROM THE EDIT WORKSPACE AMPLIFIER SETTINGS PAGE USING THE EXG AUX BOX AND DISPLAYING THE AUX CHANNELS If installation has been carried out correctly the AUX channels are always the last eight physical channels If you are using a BrainAmp ExG ExG MR amplifier these are the physical channels 9 through 16 see highlighted section in Figure 8 7 If you are using a BrainAmp and a BrainAmp ExG these are the physical channels 41 through 48 If you are using two BrainAmp amplifiers and one BrainAmp ExG these are the physical channels 73 through 80 etc If you are using only two BrainAmp ExG amplifiers these are the physical channels 9 through 16 and 25 through 32 etc BRAINVISION RECORDER Amplifier specific properties BrainAmp family 8 1 When you have selected the channels in the Phys Chn column additional data entry columns become available in the table e Diff Unit If you check this box you can use a different unit such as C for Celsius e Unit Specify the unit here e Gradient These columns allow you to specify the gradient in mV unit with a unit C for example mV C In this example you are describing the voltage d
62. function can be found in the New Workspace Edit Workspace dialog box on the third page Software Filters on the Display Filters tab and the Enable Filters check box e lf you change the setting filter on off by clicking this button the Recorder retains the corresponding status even if you interrupt and resume monitoring and data storage The workspace file is not changed and if you close the Recorder the old workspace is opened with the setting you have made when the Recorder is restarted Show Workspace Info shows the configuration of the current workspace The information contains all the settings made when editing the workspace except for the settings made on the first page of the dialog box Edit Workspace Data Files Settings Cascade Windows arranges all open windows on top of each other e oI Tile Windows arranges the windows next to each other e El Tile Windows arranges the windows one above the other e s Pa contains version information and information on the connected dongle 5 2 The Recorder interface Familiarization and operation The status bar at the bottom of the window is made up of the following sections e Monitoring The first section shows the current status of the program or 6 the operating mode for instance Monitoring Saving etc e Ptandard Montage The second section shows the type of montage used For information on montages see section 6 3 e BraimAmp_0008 eeg
63. ging Entering parameters Viewing and recording data Program configuration Configuring the user privileges Configuring the user settings 8 1 8 1 1 8 1 2 8 1 3 8 1 4 8 1 5 8 1 6 8 2 8 2 1 8 2 2 8 2 3 8 3 8 3 1 8 3 2 8 4 8 5 8 5 1 8 5 2 8 5 3 9 1 9 2 9 3 9 4 9 5 9 6 9 7 9 7 1 9 7 2 10 11 11 1 11 2 11 3 Appendix Amplifier specific properties BrainAmp family Impedance measurement Test signal Configuring the digital port marker port ExG AUX Box SyncBox Displaying the amplifiers connected QuickAmp PCI and QuickAmp USB Adapting sensors for the auxiliary AUX inputs PCI and USB Test signal Configuring the digital port marker port V Amp and FirstAmp Adapting sensors for the auxiliary AUX inputs Configuring the digital port marker port Simulated Amplifier National Instruments NI 6071e A D converter board Installation Configuration Configuring the digital port marker port OLE Automation Application Acquisition Current Workspace License Licenses Menu Enumerator types VisionRecorderMenultem VisionRecorderState Remote data access BrainVision Video Recorder Installation Configuration Combined EEG video recording EEG file format Contents About this manual About this manual This User Manual describes the EEG recording software BrainVision Recorder The User Manual is an integral part of the software This Manual must be precisely adhere
64. h to modify the marker list click Select A dialog box opens in which you can select various markers To start with choose the marker type from the left hand selection list Types Then select one or more markers from the middle list Descriptions BRAINVISION RECORDER Functional description Segmentation and averaging 6 4 Select Segmentation Markers for Avg Selected Markers Descriptions add gt gt Remove R1 FIGURE 6 21 DIALOG BOX FOR SELECTING MARKERS Click Add to add the markers to the Selected Markers list To remove a marker from this list select it and click Remove Once you have completed selection of the markers click OK The Interval Relative to Markers group box allows you to set the relative positions of the INTERVAL RELATIVE TO segment interval in one of two ways Based on Time or Based on Data Points MARKERS GROUP BOX You specify the Start and End of the interval or alternatively the duration of the interval instead of the end When defining an interval make sure that it is not too large as the Recorder will not include overlapping segments in segmentation averaging Interval Relative to Markers Based on Time T Start ms 100 End ms 1000 Duration ms 1100 C Based on Data Points Start Point 50 End Point 499 Points 550 e Averaaina FIGURE 6 22 INTERVAL RELATIVE TO MARKERS GROUP BOX 6 4 Segmentation and averaging Functiona
65. he Lowest Allowed Activity Max Min pV field Enter the length of the interval within which the activity must not fall below the specified amount in the Interval Length field If you check the Test Whole Segment box the entire segment is checked for artifacts Alternatively you can specify the length of the segment to be checked using the Interval Start ms and Interval End ms fields Under Untested Channels you can use the Select button to select the channels that are to be ignored during artifact checking The Average group box allows you to specify whether the data is to be segmented or averaged If you opt for averaging you can also perform a baseline correction Baseline Correction check box Baseline correction adjusts the baseline of every segment Correction is carried out immediately before averaging The average voltage value of the prestimulus interval is defined as the new zero value In other words the average of the points in the prestimulus interval is ascertained and this is subtracted from all points in the segment This operation is performed for all channels Points pil nnels i Averaging lf Baseline Correction Miscellaneous FIGURE 6 25 CHECK BOX FOR AVERAGING AND PERFORMING A BASELINE CORRECTION The Miscellaneous group box incorporates two functions Limited Number of Segments With this option you can limit the number of segments that you want to record during segmentation or include in aver
66. he reference type of an existing montage After you have edited the montage the system prompts you to enter a name under which you wish to save the montage You can enter a new name and thus derive a new montage from an existing one You can assign specific keyboard shortcuts to montages to allow you to switch between them quickly Pressing this keyboard shortcut activates the montages Choose Display Montage gt Options to assign the montages to the keyboard shortcuts lt Ctrl 1 gt through lt Ctrl o gt The shortcut lt Ctrl 1 gt is reserved for the default montage You can freely assign the remaining shortcuts to the existing montages Montage Options Shortcuts for Montage Selection Ley Associated Montage Standard Montage ETE FIGURE 6 14 SELECTING KEYBOARD SHORTCUTS FOR MONTAGES If you have defined one or more segmentation or averaging groups see also section 6 4 Segmentation and averaging you can use the keyboard shortcuts Ctrl Shift 1 gt through lt Ctrl Shift o gt to select the montage for the current group window in the same way Alternatively you can call a new montage by right clicking in a data window BRAINVISION RECORDER Functional description Segmentation and averaging 6 4 6 4 Segmentation and averaging The Recorder can segment or average your data based on time markers such as stimulus markers or reaction markers Segmentation is always a preliminary step in averaging Both
67. his allows you to make the relevant settings separately for each channel in a table The Copy Master Settings button allows you to copy the parameters you have entered into the table so that you only have to edit those channels for which the settings are different If you wish to insert a channel in the channel table or remove a channel from the channel table right click in the relevant row This opens a menu The first two entries of this menu allow you to insert or remove a channel without changing the name and number of the physical channel for the subsequent channels If you wish to update the names and numbers of the subsequent channels choose Insert Remove Channel and Update All Following Physical Channels High Series Name Type em Ea z an Cutoff Resist tc s Hz kOhm ye m m GI wlm m a pu lonl n as Meca a Insert Channel Remove Channel u Insert Channel and Update All Following Physical Channels Remove Channel and CERES All AS en Channels FIGURE 5 13 ee AND REMOVING CHANNELS RRANZRE FAMILY BRAINVISION RECORDER Familiarization and operation Setting up a workspace 5 3 Click the Insert command to insert a channel The physical channel index of the subsequent channels is incremented automatically The focus is set to the empty channel name and the remaining cells are filled with default values The channel type is filled in automatically on the basis of the physical chann
68. ient criterion is selected the absolute difference between two neighboring sampling points must not exceed a specified value Enter the maximum permitted difference in voltage between two data points in the Maximal Allowed Voltage Step Sampling Point uV field e Difference Criterion If this criterion is selected the maximum difference between two values within a segment must not exceed a specified value Enter the value of the maximum permitted difference in voltage between the lowest and highest value within the region to be tested in the Maximum Allowed Absolute Difference pV field e Amplitude Criterion If the amplitude criterion is selected the amplitude must not exceed one specified value and must not fall below another specified value Enter the minimum permitted voltage in the Minimal Allowed Amplitude pV field and the maximum permitted voltage in the Maximal Allowed Amplitude pV field BRAINVISION RECORDER 6 4 7 6 4 Segmentation and averaging Functional description AVERAGE GROUP BOX MISCELLANEOUS GROUP BOX 6 438 e Low Activity Criterion If this criterion is specified the system checks whether a minimum amount of activity has occurred within a defined time period If for example you specify a period of 5 ms here the program checks whether there is no change of voltage of the selected magnitude over a period of 5 ms within the test interval Enter the minimum activity in t
69. ifference in mV for a temperature change of one degree Celsius This value can also be negative e Offset The offset defines the zero point In our temperature example this is the voltage in mV that the sensor returns at a temperature of o degrees Celsius FIGURE 8 8 SECTION OF THE TABLE Pau COLUMNS If you are using the GSR MR module with the ExG AUX Box you can set up a GSR MR channel in SETTING UP A GSR MR the workspace CHANNEL The input signals for the GSR MR module must undergo correction Proceed as follows to load the corrected values e Inthe table check the box in the Diff Unit column e Move the mouse pointer to the name of the corresponding channel and click once e The drop down arrow appears in this line Select the option GSR_MR_100_xx from the drop down menu You have the option of changing the end of the channel name _xx Do not however change any of the other characters in the name of the GSR S MR channel Now the program automatically loads the corrected values 8 1 BrainAmp family Amplifier specific properties y 8 1 8 Channels Aste Number of Channels 1 L Master Settings Reston 01 L Range mv 3 2768 H Use Foki M Use ExG AUK 8 9 SETTING UP A GSR CHANNEL You can find detailed information on using the GSR MR sensor in the Operating Instructions for this module BrainVision_GSR MR Module_Operating_Instructions 001 pdf B
70. ime o no description the position is at data point 26 the length is 1 data point and the channel number is o which means that this marker relates to all channels The date is optional It is only evaluated if the marker type is New Segment The date has the following format 4 digits year 2 digits month 2 digits day 2 digits hour 24 hour system 2 digits minute 2 digits second 6 digits microsecond This means that the time resolution is one microsecond The date specification 19990311140312000000 means March 11 1999 14 03 12 003012 BRAINVISION RECORDER APPENDIX 7
71. ing Rate Hz 16 CUE 18 aux cz aw FIGURE 8 20 EDITING A WORKSPACE PAGE 2 AMPLIFIER SETTINGS FOR THE V AMP AND FIRSTAMP When you have selected the channels in the Phys Chn column additional data entry columns become available in the same way as with the BrainAmp 66 99 e Diff Unit If you check this box you can use a different unit such as g for gravitational acceleration e Unit Specify the unit here e Gradient These columns you to specify the gradient in mV unit with a unit o for example mV g In this example you are describing the voltage difference in mV for a change in gravitational acceleration of 1 g This value can also be negative e Offset The offset defines the zero point Taking the example of gravitational acceleration this is the voltage in mV sent by the sensor ato g BRAINVISION RECORDER Amplifier specific properties V Amp and FirstAmp 8 3 8 3 2 Configuring the digital port marker port Use the trigger input connectors of the amplifier for recording time synchronous events such as stimuli or patient responses Nine digital bit inputs and hence nine bits are available The first bit is numbered o and is located on the Triggers1 port jack of the amplifier All the remaining bits are located on the Triggers2 port The exact pinout of the socket is given in the Appendix A of the Operating Instructions for the BrainAmp or
72. iption Functions for viewing and recording data 6 2 6 2 2 Blocking channels To block a channel and thus suppress the signal received right click the corresponding channel name This opens a context menu Choose the Switch Off Channel lt channel name gt command The corresponding channel is blocked and the channel name and EEG curve are displayed in red To reactivate the channel and repeat the process and choose the Switch On Channel lt channel name gt command Recorder File View Display Montage Amplifier Configuration Window olu ul el alal Ale Sl7 4l A NN Fp EL 0 a da a ee OF O a P al N Switch Off Channel Fp2 aaa F3 FA Standard Montage MANN o llorare P3 FIGURE 6 8 SUPPRESSING CHANNELS 6 2 Functions for viewing and recording data Functional description 6 2 4 6 2 3 DC offset correction If you have a DC coupled amplifier then you can carry out DC offset correction with the D Recorder Do this by clicking the DC Correction _ t button You can also use the keyboard shortcut lt Ctrl D Performing a DC offset correction directly impacts the data We therefore recommend that you try to avoid DC correction in important sections of the EEG The Recorder sets a DC correction marker to flag any DC correction in the data You can also configure the Recorder in such a way that DC correction is performed automatically as soon as a channel crosses a
73. l description ARTIFACT REJECTION GROUP BOX ee The Artifact Rejection group box allows you to examine the individual segments that you want to include in segmentation averaging for various artifacts or to carry out a quality check All segments that are detected as having artifacts are excluded from segmentation averaging Artifact Rejection Gradient 10 00 pV per Point Untested Channels Diference Disabled v Ave Amplitude 200 00 pV to 200 00 pV w Low Activity 1 00 pV in 500 00 ms Miscella Test Interval Whole Segment 7 Lim Change i W Allow Manual Rejection with Space Bar Applies to all Groups Frame lf Save Data File Mame Prefire En Raw File Mamet lat Ilea Canmaraita Mi FIGURE 6 23 ARTIFACT REJECTION GROUP BOX You can also reject artifacts manually If you check the Allow Manual Rejection with Space Bar Applies to all Groups box you can subsequently reject any segment which has just been accepted during segmentation averaging by pressing the space bar This is possible until the next segment appears If you gave defined several segmentation averaging groups the rejection refers to the segment of the group with the active window The segments of the remaining groups which form an intersection with respect to time with the rejected segment are also rejected However only the most recently accepted segment in a group is checked Four criteria are used to check for artifacts Gradient Difference Amplitude
74. low to red A grayscale gradient from black to white Instead of a continuous color gradient between the minimum and maximum impedance value you can change the colors in discrete steps Do this by checking the Discrete Color Steps box In addition you can enter the number of color steps in the Number of Steps field Click the Select Font button to open a dialog box in which you can select the font used The selected font is saved in the current workspace Click Reset Font to reset the settings you have made to the default settings a l u uf 3 C 0 A da mw C 03 Font Impedance Color Codina Green Yellow Red Blue Cyan Green Black amp White Arial Black Discrete Color Step Electrode Label Select Font Display Physical CH Background Image Use Bitmap FIGURE 6 4 DEFAULT SETTINGS FOR THE FONT If you check the Display Physical Channel Number box the numbers of the physical channels are also displayed in addition to the position This setting is saved in the current workspace All amplifier families except QuickAmp PCI support this function BRAINVISION RECORDER Functional description Impedance measurement 6 1 isplay Montage Amplifier Configuration Window Help ul a el ala sellak 7118 5 BIDE el FIGURE 6 5 DISPLAYING THE POSITION AND NUMBERS OF THE PHYSICAL CHANNELS Note that the font size is not automatically adjusted in zoom mode You can replace the default backgr
75. mentation and averaging 6 4 I Save Raw Vata res Segment Avg Groups Ava Ln New Rename yl Remove E FIGURE 6 17 DEFINING GROUPS The Segment Avg Groups group box contains a list that allows you to select a group for SEGMENT AVG editing GROUPS GROUP BOX Click New to create a new group This opens the New Segmentation Group dialog box Enter the name of the group Under Copy Settings from Group it is also possible to copy the settings from an existing group NJ New Segmentation Group y Mame vi EE Copy Settings from Group None Aug FIGURE 6 18 CREATING A NEW GROUP 6 4 Segmentation and averaging Functional description MARKERS GROUP BOX 6 4 4 The Rename function allows you to rename the current group Rename Group Enter Hew Name Cancel FIGURE 6 19 RENAMING A GROUP The Remove function allows you to delete the current group The Markers group box allows you to select the markers that describe the relevant segments for the current group ing Markers Interval Use All Markers f Ba Select t Ba Artifact Rejection Gradient Mlizahlar Untested Channels FIGURE 6 20 GROUPBOX MARKERS If you check the Use All Markers box all the markers sent by the EEG amplifier are used during segmentation averaging Otherwise those markers are used that are listed with their type and description If you wis
76. montage is only used to group channels or optimize the way they are presented e Average The average reference is calculated i e the average of all selected channels is used as the reference e Bipolar The differences between different channels are calculated for a bipolar connection To begin with we recommend that you take the easiest reference type the original reference H Click OK This takes you to the edit menu for electrodes The edit menu is made up of two columns titled Chn and Chn The columns specify the channels and their reference channels The second column cannot be referenced if you have selected any reference type other than H Bipolar BRAINVISION RECORDER 6 3 1 6 3 Montages Functional description 6 3 2 Edit Bipolar Montage Cancel ef al lei Rawal ES le Ref Insert Curent Channel ee jata ia Insert Line TI TI Ea DJ gm O Pi a Dl T T a T 4 Remove Line Fu 4 TU T 4 Remove Al 7 i En 4 4 a a mo T 4 4 Arrange for Grid Views a 7 En 4 4 a a mo T 4 4 AE EE Aj 4 4 4 4 A FIGURE 6 11 EDIT MENU FOR MONTAGES In addition to the OK and Cancel buttons the following functions are available on the right hand side of the dialog box e Insert Line inserts a new line above the current line The button becomes available as soon as you enter a text in the first field of the first channel e
77. n a section Its meaning depends on the section in which it occurs There must be no blank before or after the assignment operator Most predefined keywords have a predefined value which is used by the Generic Data Reader if a keyword is not found The amplifier setup parameters are listed in the Amplifier Setup section The individual parameters are described in section 5 3 2 Edit Workspace Amplifier Settings dialog box The various predefined sections with keywords their meanings and default values are listed below Common Infos COMMON INFOS This section contains general information on the EEG file DataFile Name of the EEG file If the name does None a value must not contain a path it is assumed that the be specified EEG file is in the same folder as the header file The placeholder b can be used in the name It is replaced by the base name of the header file when the file is read in Example The entry DataFile b EEG dat in a header file named Test vhdr is interpreted as DataFile Test EEG dat MarkerFile Optional marker file containing a list of markers assigned to the EEG If no path is specified explicitly the program looks for the marker file in the folder in which the header file is located The format of the marker file is explained further below The placeholder b can be used in the name DataFormat Possible values ASCII ASCII BINARY DataOrientation Possible values MULTIPLEXED VECTORIZED All the da
78. nd bit 7 a value of 8 The total is 10 The consequence of this logic is that only markers of different types can be detected at any one time If you want to record different responses simultaneously you can do so by decoding the number values subsequently in the analysis i e assigning a separate marker to every bit Alternately you can assign a separate type to every bit in the table 8 2 QuickAmp PCI and QuickAmp USB Amplifier specific properties You can view the current state of the digital port for test purposes in the Current State field Another option available in the Digital Port Settings dialog box is debouncing e QuickAmp PCI If you check the Enable Debouncing suppresses repetition for 50 ms box repetition of a marker of the same type and same description is ignored for a period of 50 ms e QuickAmp USB If you check the Enable Debouncing in Millisecond 5 50 ms box repetition of a marker of the same type and same description is ignored for a period of 5 through 50 ms a5 Note that trigger signals must be present at least for the extent of a sampling point This means for instance that at a sampling rate of 1000 Hz the minimum length of the trigger signal is 1 ms At 500 Hz the minimum length is 2 ms etc 8 2 6 BRAINVISION RECORDER Amplifier specific properties V Amp and FirstAmp 8 3 8 3 V Amp and FirstAmp If you are using a V Amp FirstAmp amplifier the Amplifier menu in the menu bar contains the
79. nguages to do this You can also develop and run a client program under Linux or other operating systems RDAClient is a program that was developed with Microsoft Visual C Version 6 0 under Windows You can find the example project on the BrainVision program CD in the RDAClient folder RDAClient establishes the connection to the server and then waits for data in a loop When data arrives it is stored in BrainVision compatible EEG files The name of the computer on which the Recorder is running is passed to the program as an argument If this argument is not specified the local computer is examined There are two versions of the RDAClient a 16 bit version and a 32 bit version The 16 bit version works with amplifiers and A D converters with an A D range of a maximum of 16 bits The 32 bit version covers an A D range of up to 25 bits Before the RDA server can run it must have been enabled in the Recorder software To do this choose Configuration gt Preferences select the Remote Data Access tab and check the Enable Remote Data Access box Preferences FIGURE 10 1 ACTIVATING THE RDA SERVER BRAINVISION RECORDER Remote data access 10 EXAMPLE 10 1 10 Remote data access 10 2 One key term in programming involving TCP IP is socket A socket is the combination of a TCP IP address and a port number This combination describes a specific service on a computer One well known implicitly used ser
80. or the second Example channel Ch2 etc Chi Fp1 1 The first channel is named Fp1 The reference channel is assumed to be the common reference channel because no entry has been made and the resolution is 1 uV The resolution is the value by which the value of the data point is multiplied to convert it to uV or to the selected unit Binary Infos This section is only relevant if DataFormat in the Common Infos section was set to BINARY Keyword meanings peat BinaryFormat Possible values INT_16 IEEE_FLOAT_32 IEEE floating point format single precision 4 bytes per value INT_16 16 bit signed integer UINT_16 16 bit unsigned integer ChannelOffset Channel offset at which the data starts This offset is only relevant with vectorized data ChannelOffset and DataOffset can be used simultaneously a ER actual data starts BRAINVISION RECORDER Appendix EEG file format ASCII INFOS CHANNEL INFOS BINARY INFOS APPENDIX 5 Appendix EEG file format As Keyword Meaning Default SegmentHeaderSize If the data is segmented evenly the size in CONTINUED bytes of the segment header can be entered here TrailerSize Size in bytes of the trailer of the EEG file This parameter can be specified as an alternative to DataPoints in Common Infos in order to stop reading in the data before the end of the EEG file is reached UseBigEndianOrder This only applies to integer format
81. ou can assign a Separate type to every bit in the table You can view the current state of the digital port for test purposes in the Current State field Another option available in the Digital Port Settings dialog box is debouncing If you check the Enable Debouncing suppresses repetition for 50 ms box repetition of a marker of the same type and same description is ignored for a period of 50 ms Note that trigger signals must be present at least for the extent of a sampling point This a means for instance that at a sampling rate of 1000 Hz the minimum length of the trigger signal is 1 ms At 500 Hz the minimum length is 2 ms etc OLE Automation 9 9 OLE Automation The BrainVision Recorder can be controlled remotely by other programs using OLE automation methods The program ID ProglD for external access to the Recorder is VisionRecorder Application The Recorder incorporates a registered type library which is stored in Recorder exe The entry for the type library in the Registry is Vision Recorder x x Type Library where x x stands for the current version Under Windows XP and Vista the Recorder can also be controlled for example via a VB script batch file as shown below TestRecorder Create recorder object Set Rec CreateObject VisionRecorder Application Rec Acquisition ViewData Rec Acquisition StartRecording Rec CurrentWorkspace RawFileFolder amp TestData eeg WScript Sleep 5000
82. ound representation of a head by any bitmap image To load the bitmap file check the Use Bitmap box Note that you can move the electrode positions on the horizontal plane because the default background uses an isotropic representation This means that any changes to the ratio between the height and width of the display window are ignored and the head remains round In contrast to this the bitmap always fills the entire window and the electrodes retain their relative positions on the bitmap If the bitmap file you have selected does not exist or if it has an invalid format the standard background is used automatically Click the Stop Monitoring el button in the toolbar to stop impedance measurement If you have changed the positions of the electrodes the program prompts you to save these changes The electrode positions are assigned to the current workspace You can find further impedance measurement options for your amplifier in chapter 8 Amplifier specific properties BRAINVISION RECORDER 4 BACKGROUND IMAGE GROUP BOX u 6 1 5 Functional description Functions for viewing and recording data 6 2 6 2 Functions for viewing and recording data 6 2 1 Entering comments You have the option of adding comments to the recorded EEG These are displayed as markers in the lower marker area and during recording type Comment You can enter your comments as freely definable text or as predefined text
83. procedures will therefore be presented together in this section You can save the segmented or averaged data in parallel with the raw data You can also use segmentation and averaging to ascertain whether a visibly evoked potential is formed In this case you do not store the segments or the average It is also possible to save segmented data or the averaged data only and to dispense with raw data We advise you to save raw data if possible Only if you do this do you have the opportunity of B changing the averaging parameters later 6 4 1 Entering parameters You can find the segmentation averaging parameters under File gt New Workspace and File gt Edit Workspace on the third page of the dialog box 4 est Werkapce Segmenten Amis I Y Save Raw Data Markers Interval Relative to Markers Use All Markers Based on Time Start ms 100 Aug End fms 1000 Duration ms 1100 Segment Avg Groups Disabled Whole Segment Miscellaneous V Limited Number of Segments Change Max Segments ho Rename Remove Y Save Data File Name Prefix n Raw File Name V Use Separate Data Folder Sn Folder Name c Avg1 Resulting File Name Brow Brain Amp_0001 Avg1 avg Py ary er FIGURE 6 15 DIALOG BOX WITH SETTINGS FOR SEGMENTATION AND AVERAGING BRAINVISION RECORDER 6 4 1 6 4 Segmentation and averaging Functional description Es SETTINGS IN THE DIALOG BOX
84. programs concerned have been tested for compatibility This applies to the BrainVision Analyzer analysis software and to the Microsoft operating systems Windows XP and Vista provided that no modifications to the configuration of the operating system as delivered has been undertaken including official service packs and updates The following system requirements apply in respect of hardware and software SYSTEM REQUIREMENTS e Windows XP Service Pack 3 or Windows Vista Service Pack 1 Note that the QuickAmp PCI and QuickAmp USB are not compatible with a Windows Vista e Minimum configuration Intel Pentium lll processor 1 Ghz or compatible graphics adapter with a resolution of 1024 x 768 pixels and 32768 colors Windows XP 512 MB RAM Windows Vista 1GB RAM e 1 GB free hard disk space Additional storage requirements depend on the extent of the data to be processed e We recommend a monitor with a screen diagonal of at least 17 For more than 32 channels you should use a 21 monitor Start Windows and insert the supplied CD ROM into one of your CD ROM drives INSTALLATION If your PC is set up to autostart a CD ROM the menu will appear after a few moments to guide you through the installation Follow the instructions in the program Note that you can only install the Recorder if you are logged in as Administrator a If your PC is not set up to autostart CD ROMs proceed as follows under Windows XP WINDOWS XP e
85. psed Time 00 00 20 Free Space 01 08 59 FIGURE 6 31 SAVE MODE BRAINVISION RECORDER 6 4 13 Program configuration Configuring the user privileges 7 1 7 Program configuration 7 1 Configuring the user privileges Whether or not you have full or restricted access to the functions of the BrainVision Recorder depends on whether you have Administrator privileges or not All menu commands are available to you if you have Administrator privileges The following functions are only available to users with Administrator privileges File View Display Montage Amplifier Configuration Window Help 1 UL Select Folder for Workfiles Predefined Annotations Preferences Select Amplifier Select Data Storage Type Administrator FIGURE 7 1 CONFIGURATION MENU IN ADMINISTRATOR MODE The command Configuration gt Select Amplifier is used to select the amplifier to be controlled Configuration gt Select Data Storage Type allows you to switch the EEG data output format Only one format is available in the current version of the Recorder Configuration gt Administrator opens the Administrator dialog box Here you can further restrict access rights for normal users Administrator User Rights does not affect administrators i Allow User Editing Creating Workspaces i Allow User Editing Preferences i Allow User Editing Amplifier Specific Settings Other Settings
86. r each channel only appear ifa DC amplifier is connected in DC recording mode In this event the values correspond to the DC offset of the signal An offset of 100 corresponds to saturation at the positive end of the recording level range An offset of 100 corresponds to saturation at the negative end of the recording level range At the bottom of the channel list there is a scaling bar that enables you to assess the signal size If fewer channels are displayed and there is enough space a scaling bar is shown in front of every channel rie VIEW Opiy WIOTLOJE APINTET wT r UT j w elul el alal A e e 200 pV 200 uW fs FIGURE 5 8 CHANNEL NAMES DISPLAYED WITH SCALING BAR Beneath the EEG curves separated by a gray line the program displays time markers from the amplifiers digital input Familiarization and operation Setting up a workspace 5 3 5 3 Setting up a workspace 5 3 1 Settings for files and folders Setting up a workspace allows you to define the user specific recording parameters The workspace stores the location at which the EEG files are stored amplifier settings and other information The first time the Recorder is started it creates a default workspace You can also create a new workspace by choosing File gt New Workspace You load an existing workspace by choosing File gt Open Workspace je Configuration Window Help el alal aal lale l d ajmjal 8 Look
87. r is used to view the EEG data a Impedance Check performs the impedance measurement WW Test Signal You can view and save test signals using this button if the amplifier which is connected allows you to do so Start Resume Recording starts or resumes recording A dialog box opens in which you can enter a comment This comment is saved in the EEG file A filename is proposed which you can either accept or change a Pause Recording pauses the recording While the recorder is in pause mode you can measure the impedance without closing the EEG file Ms Recording stops the recording To resume recording click the Start button Olsen Monitoring closes monitoring mode Note that you can only close the program when you have explicitly stopped the recording and then closed monitoring mode by clicking the Stop Monitoring button You can save the test signals in the current EEG file You will find detailed information on the form and size of the test signal in chapter 8 B increase Interval increases the time interval displayed alternatively use the keyboard shortcut lt Ctrl gt E becrease Interval decreases the time interval displayed alternatively use the keyboard shortcut lt Ctrl gt e Al Scale Up increases the scale sensitivity alternatively use the keyboard shortcut lt Ctrl gt To use different scales for individual channels e g ECG channels you can assign different
88. s lt specifies whether big endian order is used i e whether the most significant byte in a number is stored first Macintosh Sun Possible values YES Yes big endian order is in use NO No little endian order is in use corresponds to the Intel specification The marker file is based on the same principle of sections and keywords as the header file The first line identifies the marker file and is as follows Brain Vision Data Exchange Marker File Version 1 0 The various predefined sections with keywords their meanings and default values are listed below COMMON INFOS Common Infos This section contains general information on the marker file Keyword Meanings TDefauk DataFile Name of the EEG file If the name does not contain a path it is assumed that the EEG file is in the same folder as the marker file This information is not evaluated by the Generic Data Reader APPENDIX 6 BRAINVISION RECORDER Appendix EEG file format Marker Infos MARKER INFOS This section lists the individual markers and their properties Keyword Meaning Default Mk x stands Individual properties for the marker are for the marker specified separated by commas number i e the lt Type gt lt Description gt lt Position gt keyword for the first lt Points gt lt Channel Number lt Date gt marker is Mk1 for Example the second marker Mxki Time 0 26 1 0 Mk2 etc The first marker has the type T
89. s and their meanings may differ from the terms used in neurophysiological research Device Settings Master Settings Input Mode Noneref Single ended Gain 11000 A D Range 5 y Number of channels 32 V Use Individual Settings Copy Master Settings Sampling Rate Hz 500 _ Name Phys chn Gain ADRange v Resolutiontuv 2 441406 Input Polarity Bipolar gt se 2 441406 COIN On mi WIN A oO N Nia a a Se Se ee ee Se ee Se Se OO CNM amp WIN Ao SRR 06 41406 ne 06 05 41406 4 085 06 DE 06 08 4 0 A 11406 DA 4 DE 4 06 ava DE ne Lies 06 44406 406 406 22 406 SAAN 14 UO 41406 41406 41406 ne 0 hh 00 y 32377 58 I FIGURE 8 26 EDITING A WORKSPACE PAGE 2 AMPLIFIER SETTINGS FOR THE NATIONAL INSTRUMENTS A D CONVERTER BOARD DEVICE SETTINGS In the Device Settings group box you can set the Input Mode This must match your chosen GROUP BOX wiring configuration You have three options here e Differential Every channel has its own reference A total of 32 channels are available e Noneref Single ended Unipolar without a connection to ground The reference point for all channels is the AISENSE terminal e Ref Single ended Unipolar with a connection to ground The reference point for all channels is the AIGND terminal 8 5 2 BRAINVISION RECORDER Amplifier specific properties
90. s used in combination with a 22 bit QuickAmp amplifier and a PCI card The driver version for the QuickAmp PCI is V 5 0 3 2 and can be found in the file RecorderDrivers QuickAmp PCI zip on the BrainVision CD The QuickAmp USB is used in combination with a 24 bit 22 bit QuickAmp amplifier 40 72 136 channel system and USB The correct driver version is V 6 0 0 76 and can be found in the RecorderDrivers QuickAmp USB folder on the BrainVision CD Note that only the QuickAmp USB supports non Administrator mode i e user mode a If you are using a QuickAmp amplifier the Amplifier menu in the menu bar contains the items Test Signal Values and Digital Port Settings File View Display Montage Configuration Window Help i kin Test Signal Values Digital Port Settings FIGURE 8 13 MENUPUNKT AMPLIFIER FUR QUICKAMP VERSTARKER BRAINVISION RECORDER 8 2 1 8 2 QuickAmp PCI and QuickAmp USB Amplifier specific properties 8 2 1 Adapting sensors for the auxiliary AUX inputs PCI and USB If you wish to use external sensors to measure temperature skin conductivity etc you can make the appropriate changes in the Amplifier menu of the QuickAmp PCI and QuickAmp USB To set the parameters for the sensors choose File gt Edit Workspace from the menu Go to the page Edit Workspace Amplifier Settings Main Settings Channel Settings Seanfor mplies LET Type Name Prys c mt uni un a
91. set has not been segmented MARKERBASED The data set has been segmented on the basis of one or more marker positions All segments have the same length FIXTIME Segmentation was based on fixed times All segments have the same length DataPoints Number of data points in the EEG file If no predefined value is specified data is read to the end of the file As far as binary data is concerned the TrailerSize parameter can be Set in the Binary Infos section as an alternative Codepage Codepage used in the header file ANSI Possible values UTF 8 ANSI APPENDIX 4 BRAINVISION RECORDER ASCII Infos This section is only relevant if DataFormat in the Common Infos section was set to ASCII Keyword Meaning Default DecimalSymbol Decimal symbol that is used in the EEG file This symbol can be a dot or comma In the header file the decimal symbol is always a dot SkipLines Number of header lines to be skipped Lo SkipColumns Number of columns to be skipped at the beginning of a line Channel Infos This section lists the individual channels and their properties Keyword Meaning Default Choo x stands Individual properties forthe channel are lt Channel for the channel specified separated by commas number 1 uV for number i e the lt Channel Name gt lt Reference Channel channel 1 for keyword for the Name example first channel is Ch1 lt Resolution in Units gt lt Unit gt Chi 1 1 pV f
92. settings by recording part of an EEG in conjunction with the Video Recorder and looking at the resulting quality and file size For debugging purposes choose the codec lt None In this case the video a data is not compressed You should however select this option for test purposes only e Show Time on Video shows the date and time on the video e If you check the Disable Preview Scale box you cannot change the size of the video window e Check the Capture Audio box if you also wish to record audio information e Select Audio Device is used to select the audio recording device e Ifyou have connected analog audio devices Select Audio Input allows you to select between different input options such as line in microphone phone However we recommend that you use digital audio equipment H8 BRAINVISION RECORDER Lis 11 BrainVision Video Recorder 11 4 11 3 Combined EEG video recording Once you have selected a suitable codec choose monitoring mode in the Recorder by clicking the Monitor button This brings up a window with EEG data as well as a video window in which the current video data is displayed ion Window Help weal Flak lle il IOS el MAAN NN NV Canoes Aa Ant Werner re N pur p ott Now y AA prt nn an PALEN eM Le Arn A WALA A A AA De FIGURE 11 3 COMBINED EEG VIDEO DISPLAY EXTRACT If the video camera is not ready the video window will show the message Camer
93. specified must be between 4 and 10 The Next Resulting Filename field shows the file name that results from the entries you have made Click the Next button to proceed to the second page of the workspace dialog box Edit Workspace Amplifier Settings The second page contains amplifier specific parameters These are described below using the BrainAmp as an example You will find further information on the individual EEG amplifiers and accessories QuickAmp V Amp FirstAmp and Simulated Amplifier National Instruments A D converter board in chapter 8 Amplifier specific properties BRAINVISION RECORDER Familiarization and operation Setting up a workspace 5 3 5 3 2 Amplifier specific settings Description using the BrainAmp as an example Before you specify the settings you require connect all amplifiers used and click the Scan for Amplifiers button Number oi Channel E SampingAiseiz 500 Bedeni e 05 Loe Cute fe Ragay he3 High uo Ha i Lee tH ST EET SS a ojo o a co cl h BZ CE mi FIGURE 5 11 EDITING A WORKSPACE PAGE 2 AMPLIFIER SETTINGS FOR THE BRAINAMP Note that the functions for selecting an amplifier and for inserting and deleting channels are 8 only
94. ta points for the first channel appear first in the file followed by those of the second channel etc MULTIPLEXED The values for all channels follow each other for each data point DataType Possible values TIMEDOMAIN TIMEDOMAIN The data is in the time domain FREQUENCYDOMAIN The data is in the frequency domain NumberOfChannels Number of channels in the EEG file None a value must be specified BRAINVISION RECORDER APPENDIX 3 Appendix EEG file format N Keyword Meaning i Default Samplinglinterval The sampling interval is specified in usin None a value must the time domain and in hertz in the be specified frequency domain Averaged This indicates whether the data set which is to be read in has already been averaged This is particularly relevant for enabling and disabling transforms in the Transformations menu Possible values YES Yes the data set represents data that has been averaged NO No the data set represents data that has not been averaged CONTINUED AveragedSegments Number of segments that were included in averaging This value is only evaluated if Averaged YES SegmentDataPoints If the data is segmented evenly then the number of data points per segment can be specified here SegmentationType Like Averaged this variable is relevant for NOTSEGMENTED enabling and disabling transforms in the Transformations menu in the Analyzer Possible values NOTSEGMENTED The data
95. the EEG amplifier via the electrode input socket When you click the Test Signal Ww button a signal with an amplitude of 50 uV square or 100 uV sine is generated and displayed Choose Amplifier gt Test Signal Values from the menu to select the wave form square or sine The Frequency Hz field allows you to specify the frequency of the signal in a range 1 through 50 Hz Test Signal Values Waveforms le Square Waves Sine Waves Lancel Frequency Hz 5 FIGURE 8 4 SELECTING THE TEST SIGNAL 8 1 BrainAmp family Amplifier specific properties 8 1 4 8 1 3 Configuring the digital port marker port The amplifiers PC adapter or USB adapter incorporates a 26 pole HD sub socket for recording time synchronous events such as stimuli or patient responses The socket contains 16 1 bit digital inputs that can be programmed separately from each other The exact pinout of the socket is given in the Appendix A of the Operating Instructions for the BrainAmp or BrainAmp MR The designations Doo through D15 relate to the bit number with the first bit being designated with o You make the settings for the digital port by choosing Amplifier gt Digital Port Settings Digital Port Settings Bits U 7 are High Active Input uses Pulldown Resistors C Low Active Input uses Pullup Resistors Bits 8 15 are f High Active Input uses Pulldown Resistors C Low Active Input uses Pullup Resistors
96. tings are described in detail in section 6 4 When you click Finish a dialog box opens allowing you to save the workspace file Give the file of meaningful name and press the lt Enter gt key or click Save Choose the command File gt Edit Workspace to modify the workspace Choose the command File gt Open Workspace to load a workspace If you wish to use an existing workspace as a template for a new workspace first load the existing workspace and then choose File gt New Workspace You can view the parameters of the current workspace at any time even during recording by clicking the Show Workspace Info _ button in the toolbar Further settings for the Recorder are described in chapter 7 Program configuration Amplifier H specific properties such as test signal values and digital port settings are described in chapter 8 Amplifier specific properties Functional description Impedance measurement 6 1 6 Functional description 6 1 Impedance measurement If your EEG amplifier features built in impedance measurement you can carry out such measurements using the Recorder To do this click Impedance Check in the toolbar A top view of a representation of a head appears A number of controls are located to the right of the view If your electrodes are numbered after 10 10 or 10 20 they are shown automatically on the head Itis possible to show up to 256 standard positions If this is not the cas
97. tion and operation First steps 5 1 5 Familiarization and operation Ensure that the hibernation mode in Windows is ALWAYS deactivated RESTRICTIONS TO USE 5 1 First steps Note that you must select an amplifier the first time you start the program This can only be done in Administrator mode If you do not do this the functions needed are not available see Figure 5 2 This applies to both Windows XP and Vista Under Windows XP start the Recorder by right clicking the Recorder shortcut and choosing WINDOWS XP Run As This opens the Run As dialog box Ensure that the Administrator account is selected Under Windows Vista start the Recorder by right clicking the Recorder shortcut and choosing WINDOWS VISTA Run as Administrator Open Open file location Run as administrator Pin to Start Menu Add to Quick Launch Restore previous versions Send To Cut Copy Create Shortcut Delete Rename Properties FIGURE 5 1 STARTING THE RECORDER FOR THE FIRST TIME UNDER WINDOWS VISTA BRAINVISION RECORDER 5 1 1 5 1 First steps Familiarization and operation low lulled Predefined Annotations Preferences Select Amplifier Select Data Storage Type Administrator FIGURE 5 2 THE MENU ITEM FOR SELECTING THE AMPLIFIER IS GRAYED OUT IN NORMAL USER MODE After you have first installed the software a dialog box appears in which you can select an EEG amplifier File Vi
98. tion of defining the number of rows and columns you wish to use for the channel grid Click the Refresh button to update the grid pattern that is shown You can use the mouse to freely arrange the channels and the spaces between them Montage Arrangement for Seqmentation Averaging Views Grid Size Rows E Columns l4 FIGURE 6 12 DEFINITION DIALOG BOX FOR THE GRID VIEW Zi A OK Cancel To call your new montage switch the Recorder to monitoring mode Open the Display CALLING A MONTAGE Montage menu This menu has now been extended to include the name of your new montage Choose your new montage The EEG is displayed using the montage To display the default montage again simply call it from the Display Montage menu File View Display Montage Configuration Winden a u Fp1 Fp2 F3 F4 mt New Edit Options Standard Montage 128_EEG Bipolarl pS es ee o Ct e a FIGURE 6 13 AUFRUFEN EINER ANGELEGTEN MONTAGE BRAINVISION RECORDER 63 3 6 3 Montages Functional description Es MODIFYING THE MONTAGE SWITCHING BETWEEN MONTAGES 6 3 4 If you have created a montage that does not contain any electrodes of the current setup you cannot call this montage during monitoring If you wish to modify an existing montage select it with Display Montage gt Edit and then edit it Please note that you cannot change t
99. toring In addition to the header data is sent on the number of channels nChannels the sampling interval in uS dSamplingInterval the sensitivity of the channels in V separately for each channel dResolutions and the channel names sChannelNames The size of the dResolutions field is flexible and depends on the value of nChannels sChannelNames contains all channel names in one string The individual channel names are null terminated The WriteHeaderFile RDA_MessageStart pMsg routine in RDAClient cpp shows how the fields can be exploded BRAINVISION RECORDER Remote data access 10 RDA_MessageData nType 2 This message is only received by clients that have logged in via port number 51234 This message is used to transfer 16 bit data It consists of the following elements e nBlock specifies the current block number since the start of monitoring The number can be used to identify whether a block has not been processed fast enough thus causing a data overflow An example of this is given in RDAClient cpp e nPoints specifies the number of data or sampling points in this block e nMarkers defines the number of markers in this data block e nData is the actual data in the form of 16 bit signed integers The number of values is derived from nPoints and RDA_MessageStart nChannels e Markers is a data field with markers of the RDA_Marker type The individual elements of this field can have different lengths A marker of the R
100. types 9 7 1 VisionRecorderMenultem Constants for the various menu items that can be addressed with the Menu object Enum VisionRecorderMenultem vrMiMonitoring 32777 vrMilmpedanceCheck 32778 vrMiTestsignal 32779 vrMistartRecording 32791 vrMiPauseRecording 32792 vrMiStopRecording 32793 VEMiSESP 32780 End Enum 9 7 2 VisionRecorderState Constants for the various states ofthe program Enum VisionRecorderState vrstateOff 0 vrStateMonitoring 1 vrStateTestsignal 2 vrStatelmpedanceCheck 3 vrStateSaving 4 vrstateSavingTestsignal vrstatePause 6 vrStatePauseTestsignal 7 vrStatePauselmpedanceCheck End Enum BRAINVISION RECORDER rdle state Viewing EEGs Test signal Impedance measurement Saving data Saving test signals Data saving paused Data saving paused displaying test signal Data saving paused displaying impedance measurement 10 Remote data access While it is being displayed the EEG data can be passed to other programs on the local PC and to PCs in a network via TCP IP This is referred to as remote data access RDA In this process the Recorder acts as the server and the program receiving the data acts as a client Up to ten clients can be logged in to the RDA server at the same time This chapter describes the interface that enables you to implement your own online analysis programs or bio feedback methods In principle you can use different programming la
101. uisition As Acquisition Write protected The Acquisition object CurrentWorkspace As CurrentWorkspace Write protected The current workspace Menu As Menu Write protected The Menu object State As VisionRecorderState Write protected The program status see below for enumerator types SubLicenses As Licenses Write protected Lists the registered sub licenses Version as double Write protected Specifies the current program version OLE Automation 9 BRAINVISION RECORDER 9 OLE Automation 9 2 Acquisition Description This object controls recording Methods Sub Continue This resumes interrupted recording Sub DCCorrection This performs a DC correction Sub Pause This interrupts recording Sub StartRecording FileName As String sComment As String This starts recording to FileName An optional comment can be specified Sub StopRecording This stops recording Sub StopViewing This stops the viewing of data test signals or impedance measurements Sub ViewData This displays data or starts monitoring Sub ViewTestSignal This displays test signals Sub ViewImpedance This displays impedance measurements Oh BRAINVISION RECORDER 9 3 Current Workspace Description This object represents the current workspace Methods Sub Load FileName As String This loads the specified workspace file FileName Properties FullName As String Write protect
102. vice is for example the HTTP protocol on a Web server This uses port number 80 by default The Recorder s RDA server uses two port numbers 51234 and 51244 The first port is used for 16 bit data the second port for 32 bit data The first task of the client program is to establish a connection to the server s RDA service using the port number This is done using standard socket programming that we will not explain here However you can find an example of it in RDAClient cpp or RdaClient32 cpp Then the client waits for data or messages to be sent from the server The client itself never sends data to the server Every data block received contains a header of the type RDA_MessageHeader You can find the declaration of this header and all other structures and constants in the file RecorderRDA h The header consists of three parts e guid is a128 bit constant for unique identification e nSize describes the total length of the block e nType describes the type of this message Four message types are in use at present 1 means the start of message RDA_MessageStart 2 means data block RDA_MessageData for clients of the 51234 socket 3 means end of message RDA_MessageStop and 4 means data block RDA_MessageData32 for clients ofthe 51244 socket These different messages are described below RDA_MessageStart nType 1 This message is sent by the server e when it switches to monitoring mode e after a client has logged in during moni

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