Facial self-resemblance is a putative cue of genetic relatedness. People respond to facial resemblance in a way that is consistent with it being used as a cue of kinship and inconsistent with preferences for facial resemblance being simple effects of familiarity or visual exposure to one's own face. Specifically, self-resemblance has different effects on attributions of attractiveness and trustworthiness, as well as different effects on preferences for same-sex and other-sex faces. Hormonal state also affects women's preferences for self-resembling faces in such a way as to suggest adaptations for motivating contact with family during pregnancy rather than preventing inbreeding during fertile times. Taken together, this evidence suggests that humans respond to facial self-resemblance in context-specific, potentially adaptive ways.
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