Modulation frequency discrimination with single and multiple channels in cochlear implant users

Hearing Research
John J GalvinQian-Jie Fu

Abstract

Temporal envelope cues convey important speech information for cochlear implant (CI) users. Many studies have explored CI users' single-channel temporal envelope processing. However, in clinical CI speech processors, temporal envelope information is processed by multiple channels. Previous studies have shown that amplitude modulation frequency discrimination (AMFD) thresholds are better when temporal envelopes are delivered to multiple rather than single channels. In clinical fitting, current levels on single channels must often be reduced to accommodate multi-channel loudness summation. As such, it is unclear whether the multi-channel advantage in AMFD observed in previous studies was due to coherent envelope information distributed across the cochlea or to greater loudness associated with multi-channel stimulation. In this study, single- and multi-channel AMFD thresholds were measured in CI users. Multi-channel component electrodes were either widely or narrowly spaced to vary the degree of overlap between neural populations. The reference amplitude modulation (AM) frequency was 100 Hz, and coherent modulation was applied to all channels. In Experiment 1, single- and multi-channel AMFD thresholds were measured at similar loud...Continue Reading

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Citations

Sep 18, 2015·Journal of the Association for Research in Otolaryngology : JARO·Katharina EggerBernhard Laback
Oct 3, 2015·The Journal of the Acoustical Society of America·Kara C Schvartz-Leyzac, Monita Chatterjee

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