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Current Focusing to Reduce Channel Interaction for Distant Electrodes in Cochlear Implant Programs

Speech understanding abilities are highly variable among cochlear implant (CI) listeners. Poor electrode–neuron interfaces (ENIs) caused by sparse neural survival or distant electrode placement may lead to increased channel interaction and reduced speech perception. Currently, it is not possible to...

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Autores principales: DeVries, Lindsay, Arenberg, Julie G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6277758/
https://www.ncbi.nlm.nih.gov/pubmed/30488764
http://dx.doi.org/10.1177/2331216518813811
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author DeVries, Lindsay
Arenberg, Julie G.
author_facet DeVries, Lindsay
Arenberg, Julie G.
author_sort DeVries, Lindsay
collection PubMed
description Speech understanding abilities are highly variable among cochlear implant (CI) listeners. Poor electrode–neuron interfaces (ENIs) caused by sparse neural survival or distant electrode placement may lead to increased channel interaction and reduced speech perception. Currently, it is not possible to directly measure neural survival in CI listeners; therefore, obtaining information about electrode position is an alternative approach to assessing ENIs. This information can be estimated with computerized tomography (CT) imaging; however, postoperative CT imaging is not often available. A reliable method to assess channel interaction, such as the psychophysical tuning curve (PTC), offers an alternative way to identify poor ENIs. This study aimed to determine (a) the within-subject relationship between CT-estimated electrode distance and PTC bandwidths, and (b) whether using focused stimulation on channels with suspected poor ENI improves vowel identification and sentence recognition. In 13 CI listeners, CT estimates of electrode-to-modiolus distance and PTCs bandwidths were measured for all available electrodes. Two test programs were created, wherein a subset of electrodes used focused stimulation based on (a) broad PTC bandwidth (Tuning) and (b) far electrode-to-modiolus distance (Distance). Two control programs were also created: (a) Those channels not focused in the Distance program (Inverse-Control), and (b) an all-channel monopolar program (Monopolar-Control). Across subjects, scores on the Distance and Tuning programs were significantly higher than the Inverse-Control program, and similar to the Monopolar-Control program. Subjective ratings were similar for all programs. These findings suggest that focusing channels suspected to have a high degree of channel interaction result in quite different outcomes, acutely.
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spelling pubmed-62777582018-12-10 Current Focusing to Reduce Channel Interaction for Distant Electrodes in Cochlear Implant Programs DeVries, Lindsay Arenberg, Julie G. Trends Hear Original Article Speech understanding abilities are highly variable among cochlear implant (CI) listeners. Poor electrode–neuron interfaces (ENIs) caused by sparse neural survival or distant electrode placement may lead to increased channel interaction and reduced speech perception. Currently, it is not possible to directly measure neural survival in CI listeners; therefore, obtaining information about electrode position is an alternative approach to assessing ENIs. This information can be estimated with computerized tomography (CT) imaging; however, postoperative CT imaging is not often available. A reliable method to assess channel interaction, such as the psychophysical tuning curve (PTC), offers an alternative way to identify poor ENIs. This study aimed to determine (a) the within-subject relationship between CT-estimated electrode distance and PTC bandwidths, and (b) whether using focused stimulation on channels with suspected poor ENI improves vowel identification and sentence recognition. In 13 CI listeners, CT estimates of electrode-to-modiolus distance and PTCs bandwidths were measured for all available electrodes. Two test programs were created, wherein a subset of electrodes used focused stimulation based on (a) broad PTC bandwidth (Tuning) and (b) far electrode-to-modiolus distance (Distance). Two control programs were also created: (a) Those channels not focused in the Distance program (Inverse-Control), and (b) an all-channel monopolar program (Monopolar-Control). Across subjects, scores on the Distance and Tuning programs were significantly higher than the Inverse-Control program, and similar to the Monopolar-Control program. Subjective ratings were similar for all programs. These findings suggest that focusing channels suspected to have a high degree of channel interaction result in quite different outcomes, acutely. SAGE Publications 2018-11-29 /pmc/articles/PMC6277758/ /pubmed/30488764 http://dx.doi.org/10.1177/2331216518813811 Text en © The Author(s) 2018 http://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 (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 Original Article
DeVries, Lindsay
Arenberg, Julie G.
Current Focusing to Reduce Channel Interaction for Distant Electrodes in Cochlear Implant Programs
title Current Focusing to Reduce Channel Interaction for Distant Electrodes in Cochlear Implant Programs
title_full Current Focusing to Reduce Channel Interaction for Distant Electrodes in Cochlear Implant Programs
title_fullStr Current Focusing to Reduce Channel Interaction for Distant Electrodes in Cochlear Implant Programs
title_full_unstemmed Current Focusing to Reduce Channel Interaction for Distant Electrodes in Cochlear Implant Programs
title_short Current Focusing to Reduce Channel Interaction for Distant Electrodes in Cochlear Implant Programs
title_sort current focusing to reduce channel interaction for distant electrodes in cochlear implant programs
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6277758/
https://www.ncbi.nlm.nih.gov/pubmed/30488764
http://dx.doi.org/10.1177/2331216518813811
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