We found that amygdala volume correlates with the size and complexity of social networks in adult humans. An exploratory analysis of subcortical structures did not find strong evidence for similar relationships with any other structure, but there were associations between social network variables and cortical thickness in three cortical areas, two of them with amygdala connectivity. These findings indicate that the amygdala is important in social behavior.
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The authors thank Michael Brickhouse for assistance with morphometric analyses. This study was supported by grants from the US National Institutes of Health Director's Pioneer Award (DP1OD003312) and the US National Institute on Aging (R01-AG030311, R01-AG029411 and R21-AG29840).
The authors declare no competing financial interests.
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Bickart, K., Wright, C., Dautoff, R. et al. Amygdala volume and social network size in humans. Nat Neurosci 14, 163–164 (2011). https://doi.org/10.1038/nn.2724
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