Big Amygdala, Subtle Bias: Brain Structure and Our Reactions to the Unknown

Neuroimaging links larger amygdala and stronger responses to unfamiliar faces with conservative leanings and threat sensitivity, but large replication studies show the effect is small and not diagnostic; the amygdala may function as a significance detector rather than a fear center, habituation reduces responses to known faces, and cross-group contact generally reduces prejudice, suggesting biology partly influences discomfort with difference but isn’t destiny.