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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2021-02-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-82782-4 |
| _version_ | 1819042866988580864 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-21T09:47:42Z |
| format | Article |
| id | doaj.art-2bd2e4eeeac6483daba70970c796400e |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-21T09:47:42Z |
| publishDate | 2021-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-2bd2e4eeeac6483daba70970c796400e2022-12-21T19:08:17ZengNature PortfolioScientific Reports2045-23222021-02-0111111410.1038/s41598-021-82782-4Replicability of neural responses to speech accent is driven by study design and analytical parametersC. Benjamin Strauber0Lestat R. Ali1Takako Fujioka2Candace Thille3Bruce D. McCandliss4Stanford UniversityHarvard Medical SchoolStanford UniversityStanford UniversityStanford UniversityAbstract 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.https://doi.org/10.1038/s41598-021-82782-4 |
| spellingShingle | 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 Scientific Reports |
| title | 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_short | 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 |
| url | https://doi.org/10.1038/s41598-021-82782-4 |
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