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Temporal Pitch Perception in Cochlear-Implant Users: Channel Independence in Apical Cochlear Regions

Two-electrode stimuli presented on adjacent mid-array contacts in cochlear-implant users elicit pitch percepts that are not consistent with a summation of the two temporal patterns. This indicates that low-rate temporal rate codes can be applied with considerable independence on adjacent mid-array e...

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Autores principales: Griessner, Andreas, Schatzer, Reinhold, Steixner, Viktor, Rajan, Gunesh P., Zierhofer, Clemens, Távora-Vieira, Dayse
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8165527/
https://www.ncbi.nlm.nih.gov/pubmed/34041983
http://dx.doi.org/10.1177/23312165211020645
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author Griessner, Andreas
Schatzer, Reinhold
Steixner, Viktor
Rajan, Gunesh P.
Zierhofer, Clemens
Távora-Vieira, Dayse
author_facet Griessner, Andreas
Schatzer, Reinhold
Steixner, Viktor
Rajan, Gunesh P.
Zierhofer, Clemens
Távora-Vieira, Dayse
author_sort Griessner, Andreas
collection PubMed
description Two-electrode stimuli presented on adjacent mid-array contacts in cochlear-implant users elicit pitch percepts that are not consistent with a summation of the two temporal patterns. This indicates that low-rate temporal rate codes can be applied with considerable independence on adjacent mid-array electrodes. At issue in this study was whether a similar independence of temporal pitch cues can also be observed for more apical sites of stimulation, where temporal cues have been shown to be more reliable than place cues, in contrast to middle and basal sites. In cochlear-implant recipients with single-sided deafness implanted with long lateral-wall electrode arrays, pitch percepts were assessed by matching the pitch of dual-electrode stimuli with pure tones presented to the contralateral normal-hearing ear. The results were supported with an additional pitch-ranking experiment, in a different subject population with bilateral deafness. Unmodulated pulse trains with 100, 200, and 400 pulses per second were presented on three pairs of adjacent electrodes. Pulses were separated by the minimal interchannel delay (1.7 µs) in a short-delay configuration and by half the pulse period in a long-delay configuration. The hypothesis was that subjects would perceive a pitch corresponding to the doubled temporal pattern for the long-delay stimuli due to the summation of excitation patterns from adjacent apical electrodes, if those electrodes were to activate largely overlapping neural populations. However, we found that the mean matched acoustic pitch of the long-delay pulses was not significantly different from that of the short-delay pulses. These findings suggest that also in the apical region in long-array cochlear-implant recipients, temporal cues can be transmitted largely independently on adjacent electrodes.
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spelling pubmed-81655272021-06-07 Temporal Pitch Perception in Cochlear-Implant Users: Channel Independence in Apical Cochlear Regions Griessner, Andreas Schatzer, Reinhold Steixner, Viktor Rajan, Gunesh P. Zierhofer, Clemens Távora-Vieira, Dayse Trends Hear Original Article Two-electrode stimuli presented on adjacent mid-array contacts in cochlear-implant users elicit pitch percepts that are not consistent with a summation of the two temporal patterns. This indicates that low-rate temporal rate codes can be applied with considerable independence on adjacent mid-array electrodes. At issue in this study was whether a similar independence of temporal pitch cues can also be observed for more apical sites of stimulation, where temporal cues have been shown to be more reliable than place cues, in contrast to middle and basal sites. In cochlear-implant recipients with single-sided deafness implanted with long lateral-wall electrode arrays, pitch percepts were assessed by matching the pitch of dual-electrode stimuli with pure tones presented to the contralateral normal-hearing ear. The results were supported with an additional pitch-ranking experiment, in a different subject population with bilateral deafness. Unmodulated pulse trains with 100, 200, and 400 pulses per second were presented on three pairs of adjacent electrodes. Pulses were separated by the minimal interchannel delay (1.7 µs) in a short-delay configuration and by half the pulse period in a long-delay configuration. The hypothesis was that subjects would perceive a pitch corresponding to the doubled temporal pattern for the long-delay stimuli due to the summation of excitation patterns from adjacent apical electrodes, if those electrodes were to activate largely overlapping neural populations. However, we found that the mean matched acoustic pitch of the long-delay pulses was not significantly different from that of the short-delay pulses. These findings suggest that also in the apical region in long-array cochlear-implant recipients, temporal cues can be transmitted largely independently on adjacent electrodes. SAGE Publications 2021-05-27 /pmc/articles/PMC8165527/ /pubmed/34041983 http://dx.doi.org/10.1177/23312165211020645 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by-nc/4.0/Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).
spellingShingle Original Article
Griessner, Andreas
Schatzer, Reinhold
Steixner, Viktor
Rajan, Gunesh P.
Zierhofer, Clemens
Távora-Vieira, Dayse
Temporal Pitch Perception in Cochlear-Implant Users: Channel Independence in Apical Cochlear Regions
title Temporal Pitch Perception in Cochlear-Implant Users: Channel Independence in Apical Cochlear Regions
title_full Temporal Pitch Perception in Cochlear-Implant Users: Channel Independence in Apical Cochlear Regions
title_fullStr Temporal Pitch Perception in Cochlear-Implant Users: Channel Independence in Apical Cochlear Regions
title_full_unstemmed Temporal Pitch Perception in Cochlear-Implant Users: Channel Independence in Apical Cochlear Regions
title_short Temporal Pitch Perception in Cochlear-Implant Users: Channel Independence in Apical Cochlear Regions
title_sort temporal pitch perception in cochlear-implant users: channel independence in apical cochlear regions
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8165527/
https://www.ncbi.nlm.nih.gov/pubmed/34041983
http://dx.doi.org/10.1177/23312165211020645
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