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A new study led by researchers at Virginia Commonwealth University 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.

David chesterEmily laskoAbigalec dagherNeuroscience labDepartment of psychologyCollege of humanitiesViolence prevention programVirginia commonwealth universityGetty imagesSocial psychologyIntergroup exclusionRetaliatory aggressionSamuel james west