Document Detail

Binaural benefit with and without a bilateral spectral mismatch in acoustic simulations of cochlear implant processing.
MedLine Citation:
PMID:  22968427     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: This study investigated whether a spectral mismatch across ears influences the benefit of redundancy, squelch, and head shadow differently in speech perception using acoustic simulation of bilateral cochlear implant (CI) processing.
DESIGN: Ten normal-hearing subjects participated in the study, and acoustic simulations of CIs were used to test these subjects. Sentence recognition, presented unilaterally and bilaterally, was measured at +5 dB and +10 dB signal-to-noise ratios (SNRs) with bilaterally matched and mismatched conditions. Unilateral and bilateral CIs were simulated using 8-channel sine wave vocoders. Binaural spectral mismatch was introduced by changing the relative simulated insertion depths across ears. Subjects were tested while listening with headphones; head-related transfer functions were applied before the vocoder processing to preserve natural interaural level and time differences.
RESULTS: For both SNRs, greater and more consistent binaural benefit of squelch and redundancy occurred for the matched condition whereas binaural interference of squelch and redundancy occurred for the mismatched condition. However, significant binaural benefit of head shadow existed irrespective of spectral mismatches and SNRs.
CONCLUSIONS: The results suggest that bilateral spectral mismatch may have a negative impact on the binaural benefit of squelch and redundancy for bilateral CI users. The results also suggest that clinical mapping should be carefully administrated for bilateral CI users to minimize the difference in spectral patterns between the two CIs.
Yang-Soo Yoon; You-Ree Shin; Qian-Jie Fu
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Ear and hearing     Volume:  34     ISSN:  1538-4667     ISO Abbreviation:  Ear Hear     Publication Date:    2013 May-Jun
Date Detail:
Created Date:  2013-04-24     Completed Date:  2013-11-06     Revised Date:  2014-05-08    
Medline Journal Info:
Nlm Unique ID:  8005585     Medline TA:  Ear Hear     Country:  United States    
Other Details:
Languages:  eng     Pagination:  273-9     Citation Subset:  IM    
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MeSH Terms
Acoustic Stimulation / methods*
Analysis of Variance
Cochlear Implants*
Middle Aged
Signal-To-Noise Ratio*
Speech Perception / physiology*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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