EEG synchronisation reveals the impact of group identity and membership duration on social cognitive bias
Abstract Group identity induces social cognitive biases, and membership duration may amplify these effects. This study aimed to examine such bias by analysing similarities in neural processing among individuals in competitive scenarios. The fans of two Japanese baseball teams, the Hanshin Tigers and...
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Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-08191-z |
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| author | Motoyuki Sanada Yasushi Naruse |
| author_facet | Motoyuki Sanada Yasushi Naruse |
| author_sort | Motoyuki Sanada |
| collection | DOAJ |
| description | Abstract Group identity induces social cognitive biases, and membership duration may amplify these effects. This study aimed to examine such bias by analysing similarities in neural processing among individuals in competitive scenarios. The fans of two Japanese baseball teams, the Hanshin Tigers and Orix Buffaloes, watched baseball matches between the teams, and EEG synchronisation was analysed for in-group (same team) and out-group (different team) pairs, considering fan history as a factor representing membership duration. The results revealed that in-group pairs showed stronger centroparietal alpha-phase synchronisation than out-group pairs, suggesting that top-down spatial attention modulated early visual processing in a similar way among in-group members. Furthermore, in-group pairs with longer fan histories exhibited higher parietal alpha power synchronisation, probably reflecting shared engagement and emotional responses, whereas this effect was absent in out-group pairs. Interestingly, longer fan histories were associated with reduced parietal delta and theta phase synchronisations, possibly due to diverse late-stage attentional processes among experienced fans. Additionally, frontal alpha-phase synchronisation increased with fan history, indicating enhanced auditory attention in long-term fans. These findings highlight how group identity and membership duration shape neural processing, and EEG synchronisation analysis provides a robust method for examining biases. |
| format | Article |
| id | doaj-art-62e02e711ec44e04ae239ab4618c83d5 |
| institution | DOAJ |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj-art-62e02e711ec44e04ae239ab4618c83d52025-08-20T03:03:40ZengNature PortfolioScientific Reports2045-23222025-07-0115111310.1038/s41598-025-08191-zEEG synchronisation reveals the impact of group identity and membership duration on social cognitive biasMotoyuki Sanada0Yasushi Naruse1Center for Information and Neural Networks, Advanced ICT Research Institute, National Institute of Information and Communications Technology and Osaka UniversityCenter for Information and Neural Networks, Advanced ICT Research Institute, National Institute of Information and Communications Technology and Osaka UniversityAbstract Group identity induces social cognitive biases, and membership duration may amplify these effects. This study aimed to examine such bias by analysing similarities in neural processing among individuals in competitive scenarios. The fans of two Japanese baseball teams, the Hanshin Tigers and Orix Buffaloes, watched baseball matches between the teams, and EEG synchronisation was analysed for in-group (same team) and out-group (different team) pairs, considering fan history as a factor representing membership duration. The results revealed that in-group pairs showed stronger centroparietal alpha-phase synchronisation than out-group pairs, suggesting that top-down spatial attention modulated early visual processing in a similar way among in-group members. Furthermore, in-group pairs with longer fan histories exhibited higher parietal alpha power synchronisation, probably reflecting shared engagement and emotional responses, whereas this effect was absent in out-group pairs. Interestingly, longer fan histories were associated with reduced parietal delta and theta phase synchronisations, possibly due to diverse late-stage attentional processes among experienced fans. Additionally, frontal alpha-phase synchronisation increased with fan history, indicating enhanced auditory attention in long-term fans. These findings highlight how group identity and membership duration shape neural processing, and EEG synchronisation analysis provides a robust method for examining biases.https://doi.org/10.1038/s41598-025-08191-zEEGInter-subject correlationSynchronisationCognitive biasGroup identityMembership duration |
| spellingShingle | Motoyuki Sanada Yasushi Naruse EEG synchronisation reveals the impact of group identity and membership duration on social cognitive bias Scientific Reports EEG Inter-subject correlation Synchronisation Cognitive bias Group identity Membership duration |
| title | EEG synchronisation reveals the impact of group identity and membership duration on social cognitive bias |
| title_full | EEG synchronisation reveals the impact of group identity and membership duration on social cognitive bias |
| title_fullStr | EEG synchronisation reveals the impact of group identity and membership duration on social cognitive bias |
| title_full_unstemmed | EEG synchronisation reveals the impact of group identity and membership duration on social cognitive bias |
| title_short | EEG synchronisation reveals the impact of group identity and membership duration on social cognitive bias |
| title_sort | eeg synchronisation reveals the impact of group identity and membership duration on social cognitive bias |
| topic | EEG Inter-subject correlation Synchronisation Cognitive bias Group identity Membership duration |
| url | https://doi.org/10.1038/s41598-025-08191-z |
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