MSTB Manual - Auditory Potential
Contents
1. Minimum Speech Test Battery For Adult Cochlear Implant Users 2011 2 xS ___ 2 lt gt NX 7 22 0 222 SSW is New MSTB User Manual TABLE OF CONTENTS ACKNOWLEDGEMENTS 3 ed 4 Components of the New 4 Recommended 5 ROOM SETUP AND CALIBRATION ccccccccccccsscssssssssssssesssessssssssessesesesesesesseeseeeeeeeseeeeesees 5 eee 5 Sound Rs 5 8 6 6 Audiometer Call Brat On 7 Calibration of Sound Field Loudspeakers 7 TEST ADMINISTRATION E EE E E EN EE E E EEN 8 IEVA ETOR ALE E A TE E EATE EEE ETA EEA NEAT EE EE 8 TNO GUC HOM EE E E E E E EE 8 AREAIS Ei KEAPER EE NET E EEA E E NT E 8 Test E E 8 CNC Word 10 Es AA i Es 10 Test Material 5 11 TEStsPLOCEGUTES 11 13 IMUPOAUCTION 13 Te Mater als 13 13 REFERENCES HR SR Ue 15 Version 1 0 June 2011 Page 2 of 15 A2. obtain the List Pair score Test Procedures Setup 1 Turn on the audiometer and CD player 2 Insert the CD into the CD player 3 Seat the listener in the chair facing the loudspeaker through which the sentences and noise will be played Instruct the listener to maintain an upright head position and not to lean forward or to turn his her head 4 Instruct the listener with the following written or oral instructions Imagine you are at a party There will be a man talking and several other talkers in the background The man will say Ready and then will say a sentence Repeat the sentence the man says The man s voice is easy to hear at first because his voice is louder than the others The background talkers will gradually become louder making it difficult to understand the man s voice but please guess and repeat as much of each sentence as you can I will play each sentence only once Version 1 0 June 2011 Page 13 of 15 User Manual New MSTB Test Protocol 1 Turn off Channel 1 2 Adjust Channel 2 to the HL setting that corresponds to 60 dBA 2 Direct Channel 2 output to the desired speaker 3 SKIP to the CD track containing the desired sentence list 4 PLAY the first sentence Press PAUSE to allow time for a response only if necessary It is preferable to administer the test in a continuous manner 5 On the score sheet circle the key words repeated correctly key words are underlined on the score sheets 6 W
3. of the speech materials on the CD when presented from the same speaker Calibration is a two step process First the 1000 Hz tone is used to calibrate the level at the input to the audiometer then the noise is used to calibrate the output from the loudspeakers in the sound field Both calibration steps must be performed to ensure that the test stimuli are presented at the desired level It is considered good clinical practice and assumed that a sound level meter is available for speech perception testing in the sound field Ideally calibration of sound field presentation levels should occur at each test session at a minimum daily Version 1 0 June 2011 Page 6 of 15 New MSTB User Manual Audiometer Calibration FOR TESTS PRESENTED IN QUIET AND IN NOISE The output from the audiometer is calibrated using the VU meter on each audiometer channel For the AzBio test the speech will be presented from Channel 1 and the noise if used from Channel 2 of the audiometer For the CNC test the speech will be presented from Channel 1 only For the BKB SIN test the speech and noise will be presented from Channel 2 only 1 Connect the output from the left channel of the CD player to the input of Channel 1 on the audiometer 2 Connect the output from the right channel of the CD player to the input of Channel 2 on the audiometer Turn on the CD player and audiometer Insert the CD into the CD player SKIP to Track 20 on the CD for the 1000 Hz c
4. should be administered followed by CNC words The recommended presentation level is 60 dBA which is comparable to the level of conversational speech The recommended SNR for the AzBio sentences in noise is 10 or 5 dB depending on the speech understanding abilities of the listener NOTE Please refer to the package insert of each device for the speech tests and criteria that have been approved by the FDA for determining adult cochlear implant candidacy This information also can be obtained directly from the device manufacturer ROOM SETUP AND CALIBRATION Setup Testing requires a sound isolated room with a loudspeaker and chair a compact disc player and an audiometer The sound room audiometer and loudspeaker s must be calibrated before administration of any tests Accurate calibration ensures that test results can be compared across testing laboratories and clinics Sound Room The testing should be conducted in a sound isolated room with minimal reverberation The reflective surfaces of the room walls windows and doors reflect sound and create new sound sources that are delayed versions of the original signals Those delayed sounds can reduce speech intelligibility and therefore must be minimized The sound room must be large enough for a chair to be placed in the center of the room and for the loudspeaker to be one meter from a reference point at the center of the listener s head The minimum room size required is 1 83 x 1 83 m
5. CKNOWLEDGEMENTS The production of the new Minimum Speech Test Battery MSTB for Adult Cochlear Implant Users was sponsored by the following cochlear implant manufacturers in alphabetical order Advanced Bionics LLC Cochlear Americas and MED EL Corporation The manufacturers appreciate the willingness of Auditory Potential LLC to license a subset of AzBio sentences and EtymOtic Research to license a subset of the BKB SIN sentences for the new MSTB The complete version of the AzBio sentence test can be purchased from Auditory Potential LLC www auditorypotential com and the complete version of the BKB SIN test can be purchased from Etymotic Research www etymotic com The companies gratefully acknowledge the efforts of Anthony Spahr PhD and Callen Shutters Auditory Potential LLC for the production of the new MSTB CD and initial distribution of the MSTB to adult cochlear implant centers in North America Copies of the new MSTB materials can be obtained by contacting the cochlear implant manufacturers Advanced Bionics LLC 28515 Westinghouse Place Valencia CA 91355 800 678 2575 Cochlear Americas 13059 E Peakview Ave Centennial CO 80111 Tel 800 523 5798 MED EL Corporation 2511 Old Cornwallis Road Suite 100 Durham NC 27713 Tel 888 633 3524 Substantial portions of this manual are modified extractions from the User Manual for the Minimum Speech Test Battery for Adult Cochlear Implant Users Nilsson M J McCa
6. CNC words and more difficult sentence materials such as the AzBio sentences Spahr amp Dorman 2004 and Bamford Kowal Bamford Speech in Noise BKB SIN test Etymotic Research 2005 Fabry et al 2009 Gifford et al 2010 The AzBio sentences are more difficult than the HINT sentences because they are spoken by different talkers in a conversational style with limited contextual cues that the listener can use to predict or fill in unintelligible words The sentences are presented at a fixed level in quiet or in 10 talker babble at a fixed signal to noise ratio The BKB SIN test is challenging for cochlear implant listeners because a modified adaptive approach is employed wherein sentences are presented at a fixed level and four talker babble is presented at increasingly more difficult signal to noise ratios SNRs Therefore based upon current practice and clinical needs the MSTB has been revised to include the CNC word test and subsets of the AzBio and BKB SIN tests Components of the New MSTB Package The MSTB consists of a high quality compact disk CD recording of CNC words and subsets of the AzBio and BKB SIN tests The AzBio sentences have been recorded with the target sentences and noise multi talker babble on separate channels This recording format allows the speech and noise to be presented from separate loudspeakers in the sound field at different fixed presentation levels The MSTB materials consist of e Audio CD with
7. alibration tone Press PLAY on the CD player 6 Adjust the VU meter of the audiometer to zero on Channel 1 Press STOP on the CD player 7 Repeat Step 5 and adjust the VU meter of the audiometer to zero on Channel 2 Press STOP on the CD player Calibration of Sound Field Loudspeakers FOR THE AzBIO AND CNC TESTS PRESENTED IN QUIET 1 Place the calibration microphone on a stand so that the microphone is at the position corresponding to the center of a typical listener s head when or she is seated on a chair approximately 86 centimeters or 39 inches from the floor 2 Turn on the audiometer 3 Connect the audiometer Channel 1 output to the desired speaker and route the signal to Channel 1 on the audiometer 4 Turn on the CD player 5 Insert the CD into the CD player 6 SKIP to Track 19 on the CD which contains a calibration noise Press PLAY on the CD player 7 Adjust the HL dial on Channel 1 until the calibration microphone measures 60 dBA Make note of the HL dial setting because this setting will be used to set the level of the speech signals played through Channel 1 FOR THE AzBIO SENTENCES IN NOISE 10 Talker Babble 1 Place the calibration microphone on a stand at the position corresponding to the center of a typical listener s head when or she seated in a chair approximately 86 centimeters or 39 inches from the floor 2 Turn on the audiometer Turn Channel 1 off 4 Connect the audiometer Channe
8. dB Average SNR 50 Lists 2A and 2B Version 1 0 June 2011 Page 14 of 15 21 08 18 08 15 08 12 08 9 dB 6 dB 3 08 068 3 6 dB SNR 21 dB 8 dB 15 E 12 08 9 dB 6 08 3 dB 068 3 05 10 5 7 5 18 18 12 59 New MSTB User Manual REFERENCES Auditec of St Louis 1971 Four talker babble 2515 S Big Bend Blvd St Louis MO 63143 2105 Bench J amp Bamford J 1979 Speech Hearing Tests and the Spoken Language of Hearing Impaired Children London Academic Press Bench J Kowal A amp Bamford J 1979 The BKB Bench Kowal Bamford sentence lists for partially hearing children British Journal of Audiology 13 108 112 Etymotic Research Inc BKB SIN test Speech in Noise Test Version 1 03 2005 61 Martin Lane Elk Grove Village IL 60007 www etymotic com Fabry D Firszt J B Gifford R H Holden L K amp Koch D B 2009 Evaluating speech perception benefit in adult cochlear implant recipients Audiology Today May June 36 43 Gifford R H Shallop J K amp Peterson A 2008 Speech recognition materials and ceiling effects considerations for cochlear implant programs Audiology and Neurotology 13 3 193 205 Killion M amp Niquette 2000 What can the pure tone audiogram tell us about a patient s SNR loss Hearing Journal 53 46 53 Lehiste I amp Peterson G 1959 Linguistic considerations in the study of speech inte
9. econd and third practice items allowing time for the listener to respond PLAY the next carrier and test word then press PAUSE Record the response on the score sheet If the word was repeated correctly make an X in the Phonemes Correct column under the column labeled 3 for three phonemes correct in the fourth column If the word was repeated incorrectly record the number of phonemes correct in first second or third columns under the columns 0 1 or 2 There are three phonemes per word If preferred record the whole word response under Whole Word Response Optional and calculate the number of phonemes correct at the end of the test 9 Repeat steps 7 and 8 PLAY the next word PAUSE to allow the listener to respond if necessary record the number of phonemes repeated correctly until the entire list has been presented PON Ra Calculation of Word and Phoneme Scores in Percent Correct 1 Total the X s for each column under Correct Phonemes 2 Record these totals in the worksheet section in the bottom right of the score sheet and calculate the total number of phonemes correct 3 Enter the total number of phonemes calculated as the Grand Total this is the total number of phonemes correct in the example shown 114 150 4 Enter the number of words with 3 phonemes correct at the bottom of the sheet this is the number of whole words correct in the example shown 20 50 V
10. ersion 1 0 June 2011 Page 11 of 15 New MSTB The following example demonstrates these calculations MSTB CD Track 09 Channel 1 Monosyllabic Word Test Key CNC List 1 User Manual Score all words for a beginning consonant sound a nucleus vowel sound and an ending consonant sound Total phoneme count per word 3 Phonemes must be in the appropriate order Practice Items Test Items GOOSE NAME SHORE BEAN MERGE DITCH SUN TOUGH SEIZE 10 LEASE 11 HOME 12 JAR 13 PAD 14 FALL 15 VAN 16 JUG 17 YEARN 18 MAKE 19 GALE 20 TOOTH 21 PATCH 22 BOIL 23 HATE 24 PICK 25 KNIFE ONS Grand Total Words with 3 Phonemes Correct 20 50 Words Version 1 0 June 2011 1 DUCK 2 BOMB Whole Word Correct Test Response Phonemes Items Optional 0 1 2 3 26 WRECK 27 ROUT chore 28 bin 29 30 WHEEL 31 DEAD some 32 SOB 2 9 33 MESS size 34 WISH least 35 21 24 36 WOOD ed 37 lO OF X 38 TOAD sale 39 fan 40 LOOP jmp 41 earn 1 0 040 42 SALVE mate 43 DIME 44 HULL toot 45 THIN oo Oo Oo 46 SHIRT 47 ROSE gate 0 48 sic
11. eters or 6 x 6 feet The chair should be placed in the center of the room preferably facing a corner away from any window or door Then one loudspeaker should be positioned at the level of a typical listener s head directly in front of the chair approximately 86 centimeters or 39 inches from the floor The 20 sentence lists include SNRs down to 6dB rather than and therefore provide headroom to accommodate the expected pre to postoperative improvement in speech perception Version 1 0 June 2011 Page 5 of 15 New MSTB User Manual azimuth The speaker should be located one meter from a position corresponding to the center of the listener s head as shown in Figure 1 With this arrangement both the speech and noise signals for the AzBio test when administered in noise will be presented from the same loudspeaker This arrangement typically will be used to assess performance with hearing aids preoperatively or a unilateral cochlear implant postoperatively At least one additional loudspeaker is required to assess bilateral or bimodal performance with speech and noise presented from separate loudspeakers Calibration and administration instructions for bimodal and bilateral testing will be provided in a future addendum to the manual Figure 1 Sound field test set up Calibration The stimuli on the MSTB CD have been recorded so that the calibration procedure described below can be used to set the levels of all
12. his setting will be used to set the starting level of noise played through Channel 2 bo Note Once you begin the test the level of the noise will change automatically TEST ADMINISTRATION AzBio Sentences Introduction The AzBio sentences are spoken by multiple male and female talkers using a conversational rather than deliberate speaking style In addition the sentences have limited contextual cues that make it difficult for a listener to fill in unintelligible words The lists were equated for intelligibility by presenting the sentences to normal hearing listeners through a 5 channel cochlear implant simulator Spahr amp Dorman 2004 Test Materials The subset of AzBio sentences on the MSTB consist of 8 lists of 20 sentences that range in length from 4 to 12 words Each list of 20 sentences consists of 10 sentences spoken by two male talkers and 10 sentences spoken by two female talkers 5 sentences per talker Continuous 10 talker babble is recorded on Channel 2 for assessment of performance in noise Test Procedures Setup 1 Turn on the audiometer and CD player 2 Insert the CD into the CD player 3 Seat the listener in the chair facing the loudspeaker through which the sentences will be played Instruct the listener to maintain an upright head position and not to lean forward or to turn his her head Version 1 0 June 2011 Page 8 of 15 New MSTB User Manual Instruct the listener with the following written
13. k 49 KITE 50 Sum of boxes checked for _0_ 1 Phoneme Correct 2 Phonemes Correct 3 Phonemes Correct 3 JUNE Whole Word Correct Response Phonemes Optional 0 1 2 3 wretch O bow OO WO fie eel O WwW BOOB WW 000K with 04 __ tow O X OO O X nag _sang OOX time 0 fun 1 LI O loko sit U O X kate 25 20 X1 20 x 100 40 or 2 x 20 40 Page 12 of 15 25 20 X2 X3 a Grand Total 114 150 Phonemes 76 x 100 76 New MSTB User Manual BKB SIN Test Introduction The BKB SIN test was developed to be a quick and easy procedure to assess speech understanding in noise in cochlear implant listeners and other individuals with hearing impairment The test uses the Bamford Kowal Bench sentences which were derived from language samples elicited from young hearing impaired children Bench and Bamford 1979 Bench Kowal and Bamford 1979 The sentences are spoken by a male talker in four talker babble Auditec of St Louis 1971 at prerecorded signal to noise ratios that decrease in 3 dB steps Results are reported as the SNR in dB at which the subject understands 50 of the key words i
14. l 1 and calibrate the output to the desired speaker as described immediately above in Steps 1 through 5 for testing in quiet 5 Connect the audiometer Channel 2 output to the desired speaker and route the signal to Channel 2 on the audiometer 6 Turn CD player gt Version 1 0 June 2011 Page 7 of 15 New MSTB User Manual 7 Insert the CD into the CD player 8 SKIP to Track 19 on the CD which contains the calibration noise Press PLAY on the CD Player 9 Adjust the HL dial on Channel 2 until the calibration microphone reads the desired presentation level e g 55 dBA for 5 dB SNR or 50 dBA for 10 dB SNR Make note of the HL dial setting because this setting will be used to set the level of noise played through Channel 2 10 Turn Channel 1 back on prior to testing 1 both Channels should be on for testing FOR THE BKB SIN TEST 1 Place the calibration microphone a stand at the position corresponding to the center of a typical listener s head when he or she is seated on a chair approximately 86 centimeters or 39 inches from the floor Turn on the audiometer Connect the audiometer Channel 2 output to the desired speaker Turn on the CD player Insert the CD into the CD player SKIP to Track 19 on the CD which contains the calibration noise Press PLAY on the CD Player 7 Adjust the HL dial on Channel 2 until the calibration microphone reads 60 dBA Make note of the HL dial setting because t
15. lligibility Journal of the Acoustical Society of America 31 3 280 286 Lyregaard P E 1982 Frequency selectivity and speech intelligibility in noise Scandinavian Audiology Supplement 15 113 122 Nilsson J McCaw M Soli S 1996 Minimum Speech Test Battery for Adult Cochlear Implant Users Los Angeles House Ear Institute Nilsson M J Soli S amp Sullivan J 1994 Development of the Hearing in Noise Test for the measurement of speech reception thresholds in quiet and in noise Journal of the Acoustical Society of America 95 1085 1099 Peterson G E amp Lehiste I 1962 Revised CNC lists for auditory tests Journal of Speech and Hearing Disorders 27 62 70 Spahr A amp Dorman M F 2004 Performance of subjects fit with the Advanced Bionics CII and Nucleus 3G cochlear implant devices Archives Otolaryngology Head and Neck Surgery 130 624 628 Thorndike E L amp Lorge I 1944 The Teacher s Word book of 30 000 Words New York Bureau Publications Teachers College Columbia University Version 1 0 June 2011 Page 15 of 15
16. n the sentences SNR 50 The BKB SIN was designed to compare the SNR at which an individual with hearing impairment understand 50 of sentences to the SNR at which a normal hearing person can understand 50 of sentences The difference in dB SNR compared to normative data is termed the SNR loss The SNR loss indicates the degree of difficulty experienced when listening to speech in noise which is not predictable from the pure tone audiogram e g Lyregaard 1982 Killion and Niquette 2000 Test Materials The subset of BKB SIN sentences on the new MSTB consists of 10 list pairs Each List Pair consists of two lists of 8 or 10 sentences each that have been equated for intelligibility Both lists of the pair A amp B must be administered for valid results The first sentence in each list has four key words and the remaining sentences each have three key words A verbal ready cue precedes each sentence The key words in each sentence are scored as correct or incorrect The sentences are prerecorded at SNRs that decrease in 3 dB steps Lists 9 through 13 Channel 2 on the MSTB CD have 8 sentences in each list with one sentence at each SNR of 21 18 15 12 9 6 3 and 0 dB Lists 1 through 5 Channel 2 on the MSTB CD have 10 sentences in each list with one sentence at each SNR of 21 18 15 12 9 6 3 0 3 and 6 dB Each list in the pair is individually scored and the results of the two lists are averaged to
17. nual Test Materials The CNC test consists of 500 test words organized into 50 word lists Each word is preceded by the carrier word Ready There are three practice words at the beginning of each list On the CD the words within each list are separated by approximately two seconds of silence The CNC recording on the new MSTB CD is the same as the original MSTB CD Test Procedures Setup 1 Turn on the audiometer and CD player 2 Insert the CD into the CD player 3 Seat the listener in the chair facing the loudspeaker through which the words will be played Instruct the listener to maintain an upright head position and not to lean forward or to turn his or her head 4 Instruct the listener with the following written or oral instructions This is a test of your ability to understand speech You will hear a man say the word READY followed by a test word Your task is to repeat each test word you hear the man say I will stop after each word to allow you to repeat what you heard Please repeat anything you hear even if it is only part of a word It is all right to guess I will play each word only once Test Protocol Turn off Channel 2 Adjust Channel 1 to the HL setting that corresponds to 60 dBA from the loudspeaker Direct Channel 1 output to the desired speaker SKIP to the CD track containing the desired word list PLAY the first carrier and practice word then press PAUSE to allow time for a response PLAY the s
18. on His class was on Saturday She was entitled to a bit of luxury occasionally The vacation was cancelled on account of weather The salon is not open on Mondays She had a way to justify any of her wrongdoing feel sorry for my brother On numerous occasions they left early In private she let her hair down A mother always has something better to do You should be used to taking money from ladies Who would lie about cancer for attention Hang the air freshener from your rearview mirror You can use your computer to make greeting cards guess you know what you re doing You must live in a gingerbread house The cat was born with six toes Words Correct Words Possible Percent Correct CNC Word Test Introduction The CNC word test consists of lists of monosyllabic words with equal phonemic distribution Each list exhibits approximately the same phonemic distribution as the English language Lehiste amp Peterson 1959 The original CNC lists were revised to eliminate relatively rare words and proper nouns Peterson amp Lehiste 1962 The resulting ten lists of 50 words contain monosyllabic words with a frequency of occurrence of greater than four per million as calculated in the Thorndike and Lorge word frequency tables Thorndike amp Lorge 1944 across lists Version 1 0 June 2011 Page 10 of 15 Poss 9 No oan OD gt N NN GO ON OF ON DD User Manual Score New MSTB User Ma
19. or oral instructions This is a test of your ability to understand speech You will hear a man or a woman reading a list of sentences Your task is to repeat all of the words in each sentence Please repeat everything that you hear even if it is only part of a word or part of the sentence It is all right to guess I will stop after each sentence to allow you to repeat what you heard I will play each sentence only once Test Protocol in Quiet Dy Turn off Channel 2 Adjust Channel 1 to the HL setting that corresponds to 60 dBA from the loudspeaker Direct Channel 1 output to the desired speaker SKIP to the CD track containing the desired sentence list PLAY the sentence Press PAUSE to allow time for a response On the score sheet circle the words repeated correctly in the sentence Record the number of words correctly repeated in each sentence in the column marked Score Repeat Steps 5 and 6 for subsequent sentences until the entire list of 20 sentences has been presented Test Protocol in 10 Talker Babble 1 WP w amp SD Instruct the listener with the following written or oral instructions This is a test of your ability to understand speech in a noisy situation You will hear a man or a woman reading a list of sentences in a background of noise that sounds like many people talking in a crowded room Your task is to repeat all of the words in each sentence Please repeat everything that you hear even if it is onl
20. rite the number of correct words for each sentence on the line provided Note The level of the noise will change increase as the test progresses through the list Scoring 1 Add the number of correct words for each list placing the sum in the space provided on the score sheet Subtract the total from 23 5 to obtain the SNR 50 signal to noise ratio for 50 correct Score each list then average the two scores for the List Pair using the space provided on the score sheet LIST PAIR 2 List2A 0 Key Words Correct _ 1 The cat ts sitting on the bed 4 4 2 They had a lovely day 3 3 3 The thin dog was hungry 3 2 4 They are watching the train 3 7 5 The dog played with a stick 3 2 6 The farmer keeps bull 3 9 7 The lady wore coat 3 7 8 The boy 5 running away 3 0 9 The room is getting 3 0 10 The wife helped her husband 3 0 Total Key Words Correct _ 79 SNR 5O 23 5 Correct __70 6 68 List 2B Key Words Correct 1 The lady went to the store 4 4 2 tree fell on the house 3 3 3 The fruit came in box 3 3 4 The husband brought some flowers 3 3 5 A man told the police 3 2 6 Potatoes grow in the ground 3 7 7 The big dog was dangerous 3 8 The strawberry lam was sweet 3 0 9 The boy has black hair tie 3 0 10 The mother heard the baby 3 Total Key Words Correct __76 SNR 50 23 5 Correc __7 5
21. tests in the following order e AzBio sentences 8 lists of 20 sentences on Channel 1 or left channel with continuous 10 talker babble on Channel 2 or right channel Tracks 1 through 8 e CNC word test 10 lists of 50 words Channel 1 Tracks 9 through 18 e Standard BKB SIN test 10 list pairs with 8 or10 sentences per list 16 or 20 sentences per list pair on Channel 2 or right channel Tracks 9 through 18 e Sound field calibration noise Track 19 on Channel 1 and 2 and 1 kHz VU calibration tone Track 20 on Channel 1 and 2 e This User Manual Version 1 0 June 2011 Page 4 of 15 New MSTB User Manual e Score sheets for each test which can be downloaded from Auditory Potential LLC at www auditorypotential com Recommended Protocol The following tests are recommended at the preoperative and postoperative evaluations One 20 sentence list of AzBio sentences presented in quiet One 20 sentence list of AzBio sentences presented in noise One 50 word list of CNC words One 16 sentence list pair 8 sentences per list of the BKB SIN preoperatively one 20 sentence list pair 10 sentences per list of the BKB SIN postoperatively Postimplantation assessments are recommended at three six and 12 months following device activation and annually thereafter Each test takes about 5 7 minutes to complete Fabry et al 2009 If there is insufficient time to administer all tests then the AzBio sentences in quiet and in noise
22. w V and Soli S House Ear Institute 1996 and the User Manual for the BKB SIN Etymotic Research 2005 Version 1 0 June 2011 Page 3 of 15 INTRODUCTION In 1996 a committee comprised of representatives from the American Academy of Audiology AAA the American Academy of Otolaryngology Head and Neck Surgery AAO HNS and cochlear implant manufacturers convened to identify a set of materials to be used clinically and in research studies to assess the performance of adults with cochlear implants The committee recommended the Consonant Nucleus Consonant CNC test Peterson amp Lehiste 1962 to assess open set word recognition and materials from the Hearing in Noise Test HINT Nilsson Soli amp Sullivan 1994 to assess open set sentence recognition in quiet and in speech spectrum noise These tests comprised the original Minimum Speech Test Battery for Adult Cochlear Implant Users MSTB High quality compact disc recordings of the tests were generated and distributed to cochlear implant centers Nilsson McCaw amp Soli 1996 Since the introduction of the MSTB advances in technology improvements in outcomes and changes in candidacy criteria have resulted in ceiling effects on the HINT sentences when presented in quiet To illustrate Gifford et al 2008 reported that as many as 71 of implanted adult subjects scored 85 or higher on the HINT in quiet Consequently the current trend is to assess performance in adults with
23. y part of a word or part of the sentence It is all right to guess I will stop after each sentence to allow you to repeat what you heard I will play each sentence only once Follow steps 1 through 3 above to direct the sentences to Channel 1 if not completed already Turn off Channel 1 Turn on Channel 2 Adjust Channel 2 to the HL setting that corresponds to the desired level of noise e g 55 dBA for 5 dB SNR 50 dBA for a 10 dB SNR Turn Channel 1 back on Direct Channel 1 and 2 outputs to the desired speaker Repeat Steps 4 7 immediately above under Test Protocol in Quiet Calculation of Sentence Recognition Scores 1 Count the number of words correct for each sentence Total the number of words correct for all of the sentences in the list and divide by the total number of words in the list The number of words per list is given on the score sheets For each list multiply by 100 the ratio of words correct divided by the total words to obtain the score in percent correct The following example demonstrates these calculations Version 1 0 June 2011 Page 9 of 15 New MSTB Sentence ZSo e MON OOK WD O O ON DO FW AzBio Sentence Test List 1 MSTB CD Track 01 Channel 1 Speech Channel 2 Noise Text could hear another conversation through the cordless phone She relied on him for transportation He was an ordinary person who did extraordinary things How long has this been going
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