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The tendency to perceive out-group members as more similar to each other than they really are.
Contributes to stereotyping, prejudice, and the failure to recognise diversity within other groups.
This bias helps explain stereotyping and why people say 'they all look alike' about other ethnicities but easily distinguish faces within their own.
"The human brain: 3 billion years of evolution perfecting the art of being wrong with complete certainty."