Social and visual perception of facial resemblance
Both inclusive fitness theory and optimal outbreeding theory strongly predict that some social behaviours will be contingent on genetic kinship. However, such behaviours require perceptual mechanisms for identifying cues that are reliably associated with relatedness. In humans, facial resemblance may be such a cue. In this talk, I'll review the evidence for whether social and visual perceptions of facial resemblance show evidence of adaptive design for the function of assessing genetic relatedness.