Effect of speech degradation on top-down repair: phonemic restoration with simulations of cochlear implants and combined electric-acoustic stimulation.

Journal of the Association for Research in Otolaryngology : JARO
Deniz Başkent

Abstract

The brain, using expectations, linguistic knowledge, and context, can perceptually restore inaudible portions of speech. Such top-down repair is thought to enhance speech intelligibility in noisy environments. Hearing-impaired listeners with cochlear implants commonly complain about not understanding speech in noise. We hypothesized that the degradations in the bottom-up speech signals due to the implant signal processing may have a negative effect on the top-down repair mechanisms, which could partially be responsible for this complaint. To test the hypothesis, phonemic restoration of interrupted sentences was measured with young normal-hearing listeners using a noise-band vocoder simulation of implant processing. Decreasing the spectral resolution (by reducing the number of vocoder processing channels from 32 to 4) systematically degraded the speech stimuli. Supporting the hypothesis, the size of the restoration benefit varied as a function of spectral resolution. A significant benefit was observed only at the highest spectral resolution of 32 channels. With eight channels, which resembles the resolution available to most implant users, there was no significant restoration effect. Combined electric-acoustic hearing has been p...Continue Reading

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Citations

Mar 8, 2013·PloS One·Michel Ruben Benard, Deniz Başkent
Nov 8, 2013·Journal of the Association for Research in Otolaryngology : JARO·Jefta D SaijaDeniz Başkent
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Methods Mentioned

BETA
cochlear implants
cochlear implant

Software Mentioned

EAS
Matlab Graphical User Interface

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