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

Apps, Matthew A. J., McKay, Ryan, Azevedo, Ruben T., Whitehouse, Harvey, Tsakiris, Manos (2018) Not on my team: Medial prefrontal cortex responses to ingroup fusion and unfair monetary divisions. Brain and Behavior, 8 (8). e01030. ISSN 2162-3279. (doi:10.1002/brb3.1030)

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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.

Item Type: Article
DOI/Identification number: 10.1002/brb3.1030
Uncontrolled keywords: fairness, fusion, group identity, prefrontal cortex, ultimatum game
Divisions: Faculties > Social Sciences > School of Psychology
Depositing User: Ruben Azevedo
Date Deposited: 08 May 2019 18:07 UTC
Last Modified: 03 Jun 2019 09:47 UTC
Resource URI: (The current URI for this page, for reference purposes)
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