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However, its neural mechanisms remain elusive. In a tri\u2010MRI dyad\u2010hyperscanning experiment involving 26 groups, each containing 4 participants as two rotating pairs in a coordination game, we sought to achieve reciprocity, or \u201cwinning in turn by the two interacting players,\u201d as the precursor to unselfishness. Due to its critical role in social processing, the right temporal\u2013parietal junction (rTPJ) was the seed for both time domain (connectivity) and frequency domain (i.e., coherence) analyses. For the former, negative connectivity between the rTPJ and the mentalizing network areas (e.g., the right inferior parietal lobule, rIPL) was identified, and such connectivity was further negatively correlated with the individual's final gain, supporting our task design that \u201crewarded\u201d the reciprocal participants. For the latter, cerebral coherences of the rTPJs emerged between the interacting pairs (i.e., within\u2010group interacting pairs), and the coupling between the rTPJ and the right superior temporal gyrus (rSTG) between the players who were not interacting with each other (i.e., within\u2010group noninteracting pairs). These coherences reinforce the hypotheses that the rTPJ\u2013rTPJ coupling tracks the collaboration processes and the rTPJ\u2013rSTG coupling for the emergence of decontextualized shared meaning. Our results underpin two social roles (inferring others\u2019 behavior and interpreting social outcomes) subserved by the rTPJ\u2010related network and highlight its interaction with other\u2010self\/other\u2010concerning brain areas in reaching co\u2010benefits among unselfish players.<\/jats:p>","DOI":"10.1111\/psyp.14560","type":"journal-article","created":{"date-parts":[[2024,3,12]],"date-time":"2024-03-12T04:10:06Z","timestamp":1710216606000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["When \u201cmore for others, less for self\u201d leads to co\u2010benefits: A <scp>tri\u2010MRI<\/scp> dyad\u2010hyperscanning study"],"prefix":"10.1111","volume":"61","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9757-6126","authenticated-orcid":false,"given":"Le\u2010Si","family":"Wang","sequence":"first","affiliation":[{"name":"Institute of Creative Industries Design National Cheng Kung University (NCKU)  Tainan 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