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When this participant saw pain in a member of his ingroup, there was a large neural response in the anterior cingulate cortex. When he watched a member of an outgroup in pain, there was little activity.
Genocide is only possible when dehumanization happens on a massive scale, and the perfect tool for this job is propaganda: it keys right into the neural networks that understand other people, and dials down the degree to which we empathize with them.
