Not on my team: medial prefrontal cortex responses to ingroup fusion and unfair monetary divisions

Matthew A. J. Apps, Ryan McKay, Ruben T. Azevedo, Harvey Whitehouse, Manos Tsakiris

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)
    13 Downloads (Pure)

    Abstract

    Objective: People are highly attuned to fairness, with people willingly suffering personal costs to prevent others benefitting from unfair acts. Are fairness judgments influenced by group alignments? A new theory posits that we favor ingroups and denigrate members of rival outgroups when our personal identity is fused to a group. Although the mPFC has been separately implicated in group membership and fairness processing, it is unclear whether group alignments affect medial prefrontal cortex (mPFC) activity in response to fairness. Here, we examine the contribution of different regions of the mPFC to processing from ingroup and outgroup members and test whether its response differs depending on how fused we are to an ingroup. Methods: Subjects performed rounds of the Ultimatum Game, being offered fair or unfair divisions of money from supporters of the same soccer team (ingroup), the fiercest rival (outgroup) or neutral individuals whilst undergoing functional Magnetic Resonance Imaging (fMRI). Results: Strikingly, people willingly suffered personal costs to prevent outgroup members benefitting from both unfair and fair offers. Activity across dorsal and ventral (VMPFC) portions of the mPFC reflected an interaction between fairness and group membership. VMPFC activity in particular was consistent with it coding one's fusion to a group, with the fairness by group membership interaction correlating with the extent that the responder's identity was fused to the ingroup. Conclusions: The influence of fusion on social behavior therefore seems to be linked to processing in the VMPFC.

    Original languageEnglish
    Article numbere01030
    Pages (from-to)1-13
    Number of pages13
    JournalBrain and Behavior
    Volume8
    Issue number8
    DOIs
    Publication statusPublished - Aug 2018

    Bibliographical note

    Copyright the Author(s) 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • fairness
    • fusion
    • group identity
    • prefrontal cortex
    • ultimatum game

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