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Sequential stream segregation in normally-hearing and cochlear-implant listenersa)

Sequential stream segregation by normal hearing (NH) and cochlear implant (CI) listeners was investigated using an irregular rhythm detection (IRD) task. Pure tones and narrowband noises of different bandwidths were presented monaurally to older and younger NH listeners via headphones. For CI users,...

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Autores principales: Tejani, Viral D., Schvartz-Leyzac, Kara C., Chatterjee, Monita
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Acoustical Society of America 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5218967/
https://www.ncbi.nlm.nih.gov/pubmed/28147600
http://dx.doi.org/10.1121/1.4973516
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author Tejani, Viral D.
Schvartz-Leyzac, Kara C.
Chatterjee, Monita
author_facet Tejani, Viral D.
Schvartz-Leyzac, Kara C.
Chatterjee, Monita
author_sort Tejani, Viral D.
collection PubMed
description Sequential stream segregation by normal hearing (NH) and cochlear implant (CI) listeners was investigated using an irregular rhythm detection (IRD) task. Pure tones and narrowband noises of different bandwidths were presented monaurally to older and younger NH listeners via headphones. For CI users, stimuli were delivered as pure tones via soundfield and via direct electrical stimulation. Results confirmed that tonal pitch is not essential for stream segregation by NH listeners and that aging does not reduce NH listeners' stream segregation. CI listeners' stream segregation was significantly poorer than NH listeners' with pure tone stimuli. With direct stimulation, however, CI listeners showed significantly stronger stream segregation, with a mean normalized pattern similar to NH listeners, implying that the CI speech processors possibly degraded acoustic cues. CI listeners' performance on an electrode discrimination task indicated that cues that are salient enough to make two electrodes highly discriminable may not be sufficiently salient for stream segregation, and that gap detection/discrimination, which must depend on perceptual electrode differences, did not play a role in the IRD task. Although the IRD task does not encompass all aspects of full stream segregation, these results suggest that some CI listeners may demonstrate aspects of stream segregation.
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spelling pubmed-52189672017-01-19 Sequential stream segregation in normally-hearing and cochlear-implant listenersa) Tejani, Viral D. Schvartz-Leyzac, Kara C. Chatterjee, Monita J Acoust Soc Am Psychological and Physiological Acoustics Sequential stream segregation by normal hearing (NH) and cochlear implant (CI) listeners was investigated using an irregular rhythm detection (IRD) task. Pure tones and narrowband noises of different bandwidths were presented monaurally to older and younger NH listeners via headphones. For CI users, stimuli were delivered as pure tones via soundfield and via direct electrical stimulation. Results confirmed that tonal pitch is not essential for stream segregation by NH listeners and that aging does not reduce NH listeners' stream segregation. CI listeners' stream segregation was significantly poorer than NH listeners' with pure tone stimuli. With direct stimulation, however, CI listeners showed significantly stronger stream segregation, with a mean normalized pattern similar to NH listeners, implying that the CI speech processors possibly degraded acoustic cues. CI listeners' performance on an electrode discrimination task indicated that cues that are salient enough to make two electrodes highly discriminable may not be sufficiently salient for stream segregation, and that gap detection/discrimination, which must depend on perceptual electrode differences, did not play a role in the IRD task. Although the IRD task does not encompass all aspects of full stream segregation, these results suggest that some CI listeners may demonstrate aspects of stream segregation. Acoustical Society of America 2017-01 2017-01-04 /pmc/articles/PMC5218967/ /pubmed/28147600 http://dx.doi.org/10.1121/1.4973516 Text en © 2017 Acoustical Society of America. 0001-4966/2017/141(1)/50/15/$30.00 All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Psychological and Physiological Acoustics
Tejani, Viral D.
Schvartz-Leyzac, Kara C.
Chatterjee, Monita
Sequential stream segregation in normally-hearing and cochlear-implant listenersa)
title Sequential stream segregation in normally-hearing and cochlear-implant listenersa)
title_full Sequential stream segregation in normally-hearing and cochlear-implant listenersa)
title_fullStr Sequential stream segregation in normally-hearing and cochlear-implant listenersa)
title_full_unstemmed Sequential stream segregation in normally-hearing and cochlear-implant listenersa)
title_short Sequential stream segregation in normally-hearing and cochlear-implant listenersa)
title_sort sequential stream segregation in normally-hearing and cochlear-implant listenersa)
topic Psychological and Physiological Acoustics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5218967/
https://www.ncbi.nlm.nih.gov/pubmed/28147600
http://dx.doi.org/10.1121/1.4973516
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