DeBruine LM (2002). Facial resemblance enhances trust. Proceedings of the Royal Society of London B, 269(1498): 1307-1312. doi: 10.1098/rspb.2002.2034 [data]

Organisms are expected to be sensitive to cues of genetic relatedness when making decisions about social behaviour. Relatedness can be assessed in several ways, one of which is phenotype matching: the assessment of similarity between others' traits and either one's own traits or those of known relatives. One candidate cue of relatedness in humans is facial resemblance. Here, I report the effects of an experimental manipulation of facial resemblance in a two-person sequential trust game. Subjects were shown faces of ostensible playing partners manipulated to resemble either themselves or an unknown person. Resemblance to the subject's own face raised the incidence of trusting a partner, but had no effect on the incidence of selfish betrayals of the partner's trust. Control subjects playing with identical pictures failed to show such an effect. In a second experiment, resemblance of the playing partner to a familiar (famous) person had no effect on either trusting or betrayals of trust.

Sample morphs
Click on the image to see it full-size. Thanks Meghan, Pat and Andrew for the use of your heads.
Sample morphs. Shape-colour morphs (a) were made by combining 40% of the shape and colour information from the self or non-self face with 60% of an unknown face to make the shape-colour morph. Note that the morph retains all of the unknown person's hair colour and style. Shape-only morphs (b) were made by combining 50% of the shape information from both faces and 100% of the colour information from the unfamiliar face. Note that the faces are standardized for interpupillary distance, which alters head size as a function of this distance.

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