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Amygdala structure and the tendency to regard the social system as legitimate and desirable

H. Hannah Nam (), John T. Jost, Lisa Kaggen, Daniel Campbell-Meiklejohn and Jay J. Van Bavel
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H. Hannah Nam: Stony Brook University
John T. Jost: New York University
Lisa Kaggen: New York University
Daniel Campbell-Meiklejohn: University of Sussex
Jay J. Van Bavel: New York University

Nature Human Behaviour, 2018, vol. 2, issue 2, 133-138

Abstract: Abstract Individual variation in preferences to maintain versus change the societal status quo can manifest in the political realm by choosing leaders and policies that reinforce or undermine existing inequalities 1 . We sought to understand which individuals are likely to defend or challenge inequality in society by exploring the neuroanatomical substrates of system justification tendencies. In two independent neuroimaging studies, we observed that larger bilateral amygdala volume was positively correlated with the tendency to believe that the existing social order was legitimate and desirable. These results held for members of advantaged and disadvantaged groups (men and women, respectively). Furthermore, individuals with larger amygdala volume were less likely to participate in subsequent protest movements. We ruled out alternative explanations in terms of attitudinal extremity and political orientation per se. Exploratory whole-brain analyses suggested that system justification effects may extend to structures that are adjacent to the amygdala, including parts of the insula and the orbitofrontal cortex. These findings suggest that the amygdala may provide a neural substrate for maintaining the societal status quo, and opens avenues for further investigation into the association between system justification and other neuroanatomical regions.

Date: 2018
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DOI: 10.1038/s41562-017-0248-5

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