The primary aim of this study was to examine the proportion of adult cochlear implant users with pitch-confused electrodes, identify electrodes with poor electrode-neural interface using a clinically feasible task, and determine if deactivating identified electrodes would result in improved speech perception and sound perception. Participants were asked to complete a psychometric channel discrimination and pitch-ranking task to determine electrodes to be deactivated, and results from the Minimum Speech Test Battery, Quick Spectral Modulation Detection Task, and subjective questioning were recorded in the baseline program, with the experimental program on the day it was implemented, and after a 3-6-week acclimation period. Of the 24 participants who were enrolled in the study, 19 completed the study. Thirteen out of 19 participants (68.42%) had at least one pitch-confused electrode pair. While results recorded immediately after implementation of the experimental program did not indicate significant improvements in any measures, 10 out of 13 participants (76.92%) indicated they preferred the experimental program. Results recorded after an acclimation period indicated significant improvement in CNC Words, CNC Phonemes, AzBio Sentences in Noise, and Spectral Modulation Detection. Eleven out of 13 participants (84.62%) preferred the experimental program compared to the existing baseline program. Results suggest that deactivating electrodes with pitch-confusion is a clinically-applicable task that may result in improved speech perception and sound perception in adult CI users.
|Advisor:||Atcherson, Samuel R.|
|Commitee:||Dornhoffer, John, Finley, Charles C., Franklin, Cliff, Martin, Patti F., Spahr, Anthony J.|
|School:||University of Arkansas for Medical Sciences|
|Department:||Communication Sciences and Disorders|
|School Location:||United States -- Arkansas|
|Source:||DAI-B 78/12(E), Dissertation Abstracts International|
|Keywords:||Channel interaction, Clinical outcomes, Cochlear implant, Electrode-neural interface|
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