Perceived personality traits of others affect the neural functional connectivity underlying inequity aversion

[Speaker] Nakatani, Hironori:1,2,3
[Co-author] Okanoya, Kazuo:1,2,3
1:The University of Tokyo, Graduate School of Arts and Science (Japan), 2:Okanoya Emotional Information Project, JST-ERATO (Japan), 3:RIKEN Brain Science Institute (Japan)

Social preferences in resource distribution are characterized by behaviors regarding inequity between the self and others. The preferences are flexible depending on social relationship with others. With functional magnetic resonance imaging, we investigated how the personality traits of others modulate the neural connectivity that underlie inequity aversion. The participants were engaged in a dictator game. When the face of the other was presented, the ventromedial prefrontal cortex (vmPFC) showed increased functional connectivity to the caudate head and the insula in relation to the good and neutral others, respectively. When the participants decided on the money allocations, the caudate head showed larger activation for fair allocation regarding the good others, and the insula showed larger activation for unfair allocation regarding the neutral others. Our results suggest that the vmPFC-caudate/insula circuit encompasses distinct neural mechanisms that underlie the inequity aversion regarding the different personality traits of others. (Supported by JST-ERATO)
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