Abstract：
:Normal-hearing listeners can perceptually segregate concurrent sound sources, but listeners with significant hearing loss or who wear a cochlear implant (CI) lag behind in this ability. Perceptual grouping mechanisms are essential to segregate concurrent sound sources and affect comodulation masking release (CMR). Thus, CMR measurements in CI users could shed light on segregation cues needed for forming and grouping of auditory objects. CMR illustrates the fact that detection of a target sound embedded in a fluctuating masker is improved by the addition of masker energy remote from the target frequency, provided the envelope fluctuations across masker components are coherent. We modified such a CMR experiment to electrically-induced hearing using direct stimulation and measured the effect in 21 CI users. Cluster analysis of our data revealed two groups: one showed no or only small CMR of 0.1 dB ± 2.7 (N = 14) and a second group achieved a CMR of 10.7 dB ± 3.2 (N = 7), a value that is close to the enhancement observed in a comparable acoustic experiment in normal-hearing listeners (12.9 dB ± 2.6, N = 6). Interestingly, we observed that CMR in CI users may relate to hearing etiology and duration of hearing loss pre-implantation. Our study demonstrates for the first time that a substantial minority of cochlear-implant listeners (about a third) can show significant CMR. This outcome motivates the development of physiologically inspired multi-band gain control and/or different coding strategies for these groups in order to better preserve coherent modulation and thus to take advantage of the individual remaining capabilities to analyze spectro-temporal patterns.
journal_name
Hear Resjournal_title
Hearing researchauthors
Zirn S,Hempel JM,Schuster M,Hemmert Wdoi
10.1016/j.heares.2012.11.023subject
Has Abstractpub_date
2013-02-01 00:00:00pages
60-6eissn
0378-5955issn
1878-5891pii
S0378-5955(12)00293-6journal_volume
296pub_type
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