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Potential Destructive Binaural Interaction Effects in Auditory Steady-State Response Measurements

An aided sound-field auditory steady-state response (ASSR) has the potential to be used to objectively validate hearing-aid (HA) fittings in clinics. Each aided ear should ideally be tested independently, but it is suspected that binaural testing may be used by clinics to reduce test time. This stud...

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Autores principales: Watson, Sam, Laugesen, Søren, Epp, Bastian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8580520/
https://www.ncbi.nlm.nih.gov/pubmed/34452588
http://dx.doi.org/10.1177/23312165211031130
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author Watson, Sam
Laugesen, Søren
Epp, Bastian
author_facet Watson, Sam
Laugesen, Søren
Epp, Bastian
author_sort Watson, Sam
collection PubMed
description An aided sound-field auditory steady-state response (ASSR) has the potential to be used to objectively validate hearing-aid (HA) fittings in clinics. Each aided ear should ideally be tested independently, but it is suspected that binaural testing may be used by clinics to reduce test time. This study simulates dichotic ASSR sound-field conditions to examine the risk of making false judgments due to unchecked binaural effects. Unaided ASSRs were recorded with a clinical two-channel electroencephalography (EEG) system for 15 normal hearing subjects using a three-band CE-Chirp® stimulus. It was found that the noise corrected power of a response harmonic can be suppressed by up to 10 dB by introducing large interaural time differences equal to half the time period of the stimulus envelope, which may occur in unilateral HA users. These large interaural time differences also changed the expression of ASSR power across the scalp, resulting in dramatically altered topographies. This would lead to considerably lower measured response power and possibly nondetections, evidencing that even well fit HAs are fit poorly (false referral), whereas monaural ASSR tests would pass. No effect was found for simulated lateralizations of the stimulus, which is beneficial for a proposed aided ASSR approach. Full-scalp ASSR recordings match previously found 40 Hz topographies but demonstrate suppression of cortical ASSR sources when using stimuli in interaural envelope antiphase.
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spelling pubmed-85805202021-11-11 Potential Destructive Binaural Interaction Effects in Auditory Steady-State Response Measurements Watson, Sam Laugesen, Søren Epp, Bastian Trends Hear 2019 ISAAR special collection: Original Article An aided sound-field auditory steady-state response (ASSR) has the potential to be used to objectively validate hearing-aid (HA) fittings in clinics. Each aided ear should ideally be tested independently, but it is suspected that binaural testing may be used by clinics to reduce test time. This study simulates dichotic ASSR sound-field conditions to examine the risk of making false judgments due to unchecked binaural effects. Unaided ASSRs were recorded with a clinical two-channel electroencephalography (EEG) system for 15 normal hearing subjects using a three-band CE-Chirp® stimulus. It was found that the noise corrected power of a response harmonic can be suppressed by up to 10 dB by introducing large interaural time differences equal to half the time period of the stimulus envelope, which may occur in unilateral HA users. These large interaural time differences also changed the expression of ASSR power across the scalp, resulting in dramatically altered topographies. This would lead to considerably lower measured response power and possibly nondetections, evidencing that even well fit HAs are fit poorly (false referral), whereas monaural ASSR tests would pass. No effect was found for simulated lateralizations of the stimulus, which is beneficial for a proposed aided ASSR approach. Full-scalp ASSR recordings match previously found 40 Hz topographies but demonstrate suppression of cortical ASSR sources when using stimuli in interaural envelope antiphase. SAGE Publications 2021-08-27 /pmc/articles/PMC8580520/ /pubmed/34452588 http://dx.doi.org/10.1177/23312165211031130 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 2019 ISAAR special collection: Original Article
Watson, Sam
Laugesen, Søren
Epp, Bastian
Potential Destructive Binaural Interaction Effects in Auditory Steady-State Response Measurements
title Potential Destructive Binaural Interaction Effects in Auditory Steady-State Response Measurements
title_full Potential Destructive Binaural Interaction Effects in Auditory Steady-State Response Measurements
title_fullStr Potential Destructive Binaural Interaction Effects in Auditory Steady-State Response Measurements
title_full_unstemmed Potential Destructive Binaural Interaction Effects in Auditory Steady-State Response Measurements
title_short Potential Destructive Binaural Interaction Effects in Auditory Steady-State Response Measurements
title_sort potential destructive binaural interaction effects in auditory steady-state response measurements
topic 2019 ISAAR special collection: Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8580520/
https://www.ncbi.nlm.nih.gov/pubmed/34452588
http://dx.doi.org/10.1177/23312165211031130
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