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Bilateral Versus Unilateral Cochlear Implantation in Adult Listeners: Speech-On-Speech Masking and Multitalker Localization

Binaural hearing helps normal-hearing listeners localize sound sources and understand speech in noise. However, it is not fully understood how far this is the case for bilateral cochlear implant (CI) users. To determine the potential benefits of bilateral over unilateral CIs, speech comprehension th...

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Autores principales: Rana, Baljeet, Buchholz, Jörg M., Morgan, Catherine, Sharma, Mridula, Weller, Tobias, Konganda, Shivali Appaiah, Shirai, Kyoko, Kawano, Atsushi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5536376/
https://www.ncbi.nlm.nih.gov/pubmed/28752811
http://dx.doi.org/10.1177/2331216517722106
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author Rana, Baljeet
Buchholz, Jörg M.
Morgan, Catherine
Sharma, Mridula
Weller, Tobias
Konganda, Shivali Appaiah
Shirai, Kyoko
Kawano, Atsushi
author_facet Rana, Baljeet
Buchholz, Jörg M.
Morgan, Catherine
Sharma, Mridula
Weller, Tobias
Konganda, Shivali Appaiah
Shirai, Kyoko
Kawano, Atsushi
author_sort Rana, Baljeet
collection PubMed
description Binaural hearing helps normal-hearing listeners localize sound sources and understand speech in noise. However, it is not fully understood how far this is the case for bilateral cochlear implant (CI) users. To determine the potential benefits of bilateral over unilateral CIs, speech comprehension thresholds (SCTs) were measured in seven Japanese bilateral CI recipients using Helen test sentences (translated into Japanese) in a two-talker speech interferer presented from the front (co-located with the target speech), ipsilateral to the first-implanted ear (at +90° or −90°), and spatially symmetric at ±90°. Spatial release from masking was calculated as the difference between co-located and spatially separated SCTs. Localization was assessed in the horizontal plane by presenting either male or female speech or both simultaneously. All measurements were performed bilaterally and unilaterally (with the first implanted ear) inside a loudspeaker array. Both SCTs and spatial release from masking were improved with bilateral CIs, demonstrating mean bilateral benefits of 7.5 dB in spatially asymmetric and 3 dB in spatially symmetric speech mixture. Localization performance varied strongly between subjects but was clearly improved with bilateral over unilateral CIs with the mean localization error reduced by 27°. Surprisingly, adding a second talker had only a negligible effect on localization.
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spelling pubmed-55363762017-08-16 Bilateral Versus Unilateral Cochlear Implantation in Adult Listeners: Speech-On-Speech Masking and Multitalker Localization Rana, Baljeet Buchholz, Jörg M. Morgan, Catherine Sharma, Mridula Weller, Tobias Konganda, Shivali Appaiah Shirai, Kyoko Kawano, Atsushi Trends Hear Special Issue: Australian Hearing Hub Binaural hearing helps normal-hearing listeners localize sound sources and understand speech in noise. However, it is not fully understood how far this is the case for bilateral cochlear implant (CI) users. To determine the potential benefits of bilateral over unilateral CIs, speech comprehension thresholds (SCTs) were measured in seven Japanese bilateral CI recipients using Helen test sentences (translated into Japanese) in a two-talker speech interferer presented from the front (co-located with the target speech), ipsilateral to the first-implanted ear (at +90° or −90°), and spatially symmetric at ±90°. Spatial release from masking was calculated as the difference between co-located and spatially separated SCTs. Localization was assessed in the horizontal plane by presenting either male or female speech or both simultaneously. All measurements were performed bilaterally and unilaterally (with the first implanted ear) inside a loudspeaker array. Both SCTs and spatial release from masking were improved with bilateral CIs, demonstrating mean bilateral benefits of 7.5 dB in spatially asymmetric and 3 dB in spatially symmetric speech mixture. Localization performance varied strongly between subjects but was clearly improved with bilateral over unilateral CIs with the mean localization error reduced by 27°. Surprisingly, adding a second talker had only a negligible effect on localization. SAGE Publications 2017-07-28 /pmc/articles/PMC5536376/ /pubmed/28752811 http://dx.doi.org/10.1177/2331216517722106 Text en © The Author(s) 2017 http://creativecommons.org/licenses/by-nc/4.0/ This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.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 Special Issue: Australian Hearing Hub
Rana, Baljeet
Buchholz, Jörg M.
Morgan, Catherine
Sharma, Mridula
Weller, Tobias
Konganda, Shivali Appaiah
Shirai, Kyoko
Kawano, Atsushi
Bilateral Versus Unilateral Cochlear Implantation in Adult Listeners: Speech-On-Speech Masking and Multitalker Localization
title Bilateral Versus Unilateral Cochlear Implantation in Adult Listeners: Speech-On-Speech Masking and Multitalker Localization
title_full Bilateral Versus Unilateral Cochlear Implantation in Adult Listeners: Speech-On-Speech Masking and Multitalker Localization
title_fullStr Bilateral Versus Unilateral Cochlear Implantation in Adult Listeners: Speech-On-Speech Masking and Multitalker Localization
title_full_unstemmed Bilateral Versus Unilateral Cochlear Implantation in Adult Listeners: Speech-On-Speech Masking and Multitalker Localization
title_short Bilateral Versus Unilateral Cochlear Implantation in Adult Listeners: Speech-On-Speech Masking and Multitalker Localization
title_sort bilateral versus unilateral cochlear implantation in adult listeners: speech-on-speech masking and multitalker localization
topic Special Issue: Australian Hearing Hub
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5536376/
https://www.ncbi.nlm.nih.gov/pubmed/28752811
http://dx.doi.org/10.1177/2331216517722106
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