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Channel interaction limits melodic pitch perception in simulated cochlear implants
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In cochlear implants (CIs), melodicpitch perception is limited by the spectral resolution, which in turn is limited by the number of spectral channels as well as interactions between adjacent channels. This study investigated the effect of channel interaction on melodic contour identification (MCI) in normal-hearing subjects listening to novel 16-channel sinewave vocoders that simulated channel interaction in CIsignal processing. MCI performance worsened as the degree of channel interaction increased. Although greater numbers of spectral channels may be beneficial to melodicpitch perception, the present data suggest that it is also important to improve independence among spectral channels.
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