Us versus them: Harming the ‘outgroup’ is linked to elevated activity in the brain’s reward circuitry: A new study used brain imaging to explain why humans are aggressive toward rival groups

Humans tend to form groups, which often find themselves in conflict with rival groups. But why do people show such a ready tendency to harm people in opposing groups? A new study led by researchers at Virginia Commonwealth University used functional brain imaging technology to reveal a potential answer: It increases activity in the brain’s reward network.

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