論文

査読有り 国際誌
2020年4月15日

Role of the right temporoparietal junction in intergroup bias in trust decisions.

Human brain mapping
  • Junya Fujino
  • ,
  • Shisei Tei
  • ,
  • Takashi Itahashi
  • ,
  • Yuta Y Aoki
  • ,
  • Haruhisa Ohta
  • ,
  • Manabu Kubota
  • ,
  • Ryu-Ichiro Hashimoto
  • ,
  • Hidehiko Takahashi
  • ,
  • Nobumasa Kato
  • ,
  • Motoaki Nakamura

41
6
開始ページ
1677
終了ページ
1688
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1002/hbm.24903

Intergroup bias, which is the tendency to behave more positively toward an in-group member than toward an out-group member, is pervasive in real life. In particular, intergroup bias in trust decisions substantially influences multiple areas of life and thus better understanding of this tendency can provide significant insights into human social behavior. Although previous functional magnetic resonance imaging studies showed the involvement of the right temporoparietal junction (TPJ) in intergroup trust bias, a causal relationship between the two has rarely been explored. By combining repetitive transcranial magnetic stimulation and a newly developed trust game task, we investigated the causal role of the right TPJ in intergroup bias in trust decisions. In the trust game task, the counterpart's group membership (in-group or out-group) and reciprocity were manipulated. We applied either neuronavigated inhibitory continuous theta burst stimulation (cTBS) or sham stimulation over the right TPJ before performing the trust game task in healthy volunteers. After the sham stimulation, the participants' degrees of investments with in-group members were significantly higher than those with out-group members. However, after cTBS to the right TPJ, this difference was not observed. The current results extend previous findings by showing that the causal roles of the right TPJ can be observed in intergroup bias in trust decisions. Our findings add to our understanding of the mechanisms of human social behavior.

リンク情報
DOI
https://doi.org/10.1002/hbm.24903
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/31854496
PubMed Central
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7268017

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