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Interpersonal brain synchronization during face-to-face economic exchange between acquainted dyads

Yuto Kikuchi, View ORCID ProfileKensuke Tanioka, View ORCID ProfileTomoyuki Hiroyasu, View ORCID ProfileSatoru Hiwa
doi: https://doi.org/10.1101/2021.12.20.473563
Yuto Kikuchi
1Graduate School of Life and Medical Sciences, Doshisha University, Kyoto, Japan
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Kensuke Tanioka
2Department of Biomedical Sciences and Informatics, Doshisha University, Kyoto, Japan
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Tomoyuki Hiroyasu
2Department of Biomedical Sciences and Informatics, Doshisha University, Kyoto, Japan
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Satoru Hiwa
2Department of Biomedical Sciences and Informatics, Doshisha University, Kyoto, Japan
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  • ORCID record for Satoru Hiwa
  • For correspondence: shiwa@mail.doshisha.ac.jp
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Abstract

Interpersonal brain synchronization (IBS) has been observed during social interactions and involves various factors, such as familiarity with the partner and type of social activity. A previous study has shown that face-to-face interactions in pairs of strangers increase IBS. However, it is unclear whether this can be observed when the nature of the interacting partners is different. Herein, we aimed to extend these findings to pairs of acquaintances. Neural activity in the frontal and temporal regions was recorded using functional near-infrared spectroscopy hyperscanning. Participants played an ultimatum game that required virtual economic exchange in two experimental settings: the face-to-face and face-blocked conditions. Random pair analysis confirmed whether IBS was induced by social interaction. Contrary to the aforementioned study, our results did not show any cooperative behavior or task-induced IBS increase. Conversely, the random pair analysis results revealed that the pair-specific IBS was significant only in the task condition at the left and right superior frontal, middle frontal, orbital superior frontal, right superior temporal, precentral, and postcentral gyri. Our results revealed that face-to-face interaction in acquainted pairs did not increase IBS and supported the idea that IBS is affected by “with whom we interact and how.”

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted December 21, 2021.
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Interpersonal brain synchronization during face-to-face economic exchange between acquainted dyads
Yuto Kikuchi, Kensuke Tanioka, Tomoyuki Hiroyasu, Satoru Hiwa
bioRxiv 2021.12.20.473563; doi: https://doi.org/10.1101/2021.12.20.473563
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Interpersonal brain synchronization during face-to-face economic exchange between acquainted dyads
Yuto Kikuchi, Kensuke Tanioka, Tomoyuki Hiroyasu, Satoru Hiwa
bioRxiv 2021.12.20.473563; doi: https://doi.org/10.1101/2021.12.20.473563

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