Comodulation Masking Release induced by controlled electrical stimulation of auditory nerve fibers.

Comodulation Masking Release induced by controlled electrical stimulation of auditory nerve fibers.
Hear Res. 2012 Dec 5;296C:60-66
Authors: Zirn S, Hempel JM, Schuster M, Hemmert W
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 d...

Source: Hearing Research - December 5, 2012 Category: Audiology Authors: Zirn S, Hempel JM, Schuster M, Hemmert W Tags: Hear Res Source Type: research