Replicability of neural responses to speech accent is driven by study design and analytical parameters

Abstract Recent studies have reported evidence that listeners' brains process meaning differently in speech with an in-group as compared to an out-group accent. However, among studies that have used electroencephalography (EEG) to examine neural correlates of semantic processing of speech in di...

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Autores principales:	C. Benjamin Strauber, Lestat R. Ali, Takako Fujioka, Candace Thille, Bruce D. McCandliss
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2bd2e4eeeac6483daba70970c796400e
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spelling	oai:doaj.org-article:2bd2e4eeeac6483daba70970c796400e2021-12-02T11:37:27ZReplicability of neural responses to speech accent is driven by study design and analytical parameters10.1038/s41598-021-82782-42045-2322https://doaj.org/article/2bd2e4eeeac6483daba70970c796400e2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82782-4https://doaj.org/toc/2045-2322Abstract Recent studies have reported evidence that listeners' brains process meaning differently in speech with an in-group as compared to an out-group accent. However, among studies that have used electroencephalography (EEG) to examine neural correlates of semantic processing of speech in different accents, the details of findings are often in conflict, potentially reflecting critical variations in experimental design and/or data analysis parameters. To determine which of these factors might be driving inconsistencies in results across studies, we systematically investigate how analysis parameter sets from several of these studies impact results obtained from our own EEG data set. Data were collected from forty-nine monolingual North American English listeners in an event-related potential (ERP) paradigm as they listened to semantically congruent and incongruent sentences spoken in an American accent and an Indian accent. Several key effects of in-group as compared to out-group accent were robust across the range of parameters found in the literature, including more negative scalp-wide responses to incongruence in the N400 range, more positive posterior responses to congruence in the N400 range, and more positive posterior responses to incongruence in the P600 range. These findings, however, are not fully consistent with the reported observations of the studies whose parameters we used, indicating variation in experimental design may be at play. Other reported effects only emerged under a subset of the analytical parameters tested, suggesting that analytical parameters also drive differences. We hope this spurs discussion of analytical parameters and investigation of the contributions of individual study design variables in this growing field.C. Benjamin StrauberLestat R. AliTakako FujiokaCandace ThilleBruce D. McCandlissNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q C. Benjamin Strauber Lestat R. Ali Takako Fujioka Candace Thille Bruce D. McCandliss Replicability of neural responses to speech accent is driven by study design and analytical parameters
description	Abstract Recent studies have reported evidence that listeners' brains process meaning differently in speech with an in-group as compared to an out-group accent. However, among studies that have used electroencephalography (EEG) to examine neural correlates of semantic processing of speech in different accents, the details of findings are often in conflict, potentially reflecting critical variations in experimental design and/or data analysis parameters. To determine which of these factors might be driving inconsistencies in results across studies, we systematically investigate how analysis parameter sets from several of these studies impact results obtained from our own EEG data set. Data were collected from forty-nine monolingual North American English listeners in an event-related potential (ERP) paradigm as they listened to semantically congruent and incongruent sentences spoken in an American accent and an Indian accent. Several key effects of in-group as compared to out-group accent were robust across the range of parameters found in the literature, including more negative scalp-wide responses to incongruence in the N400 range, more positive posterior responses to congruence in the N400 range, and more positive posterior responses to incongruence in the P600 range. These findings, however, are not fully consistent with the reported observations of the studies whose parameters we used, indicating variation in experimental design may be at play. Other reported effects only emerged under a subset of the analytical parameters tested, suggesting that analytical parameters also drive differences. We hope this spurs discussion of analytical parameters and investigation of the contributions of individual study design variables in this growing field.
format	article
author	C. Benjamin Strauber Lestat R. Ali Takako Fujioka Candace Thille Bruce D. McCandliss
author_facet	C. Benjamin Strauber Lestat R. Ali Takako Fujioka Candace Thille Bruce D. McCandliss
author_sort	C. Benjamin Strauber
title	Replicability of neural responses to speech accent is driven by study design and analytical parameters
title_short	Replicability of neural responses to speech accent is driven by study design and analytical parameters
title_full	Replicability of neural responses to speech accent is driven by study design and analytical parameters
title_fullStr	Replicability of neural responses to speech accent is driven by study design and analytical parameters
title_full_unstemmed	Replicability of neural responses to speech accent is driven by study design and analytical parameters
title_sort	replicability of neural responses to speech accent is driven by study design and analytical parameters
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/2bd2e4eeeac6483daba70970c796400e
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Replicability of neural responses to speech accent is driven by study design and analytical parameters

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