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Relationship between facial asymmetry and judging trustworthiness in faces

Nonverbal facial signals provide valuable information for successful social interactions. Previous findings showed left-right facial asymmetry in attractiveness, smiling, and health in faces, and here we investigated the asymmetrical status of trustworthiness. Pairs of left-left and right-right faces from 38 photographs were viewed by participants who judged which member of the pair looked the most trustworthy. The results were compared to attractiveness and smiling judgements (Zaidel, Chen, & German, 1995). We found that trustworthiness was more related to attractiveness than to smiling in the women's faces, but no significant asymmetry for trustworthiness was found; in the men's faces, trustworthiness was neither related to attractiveness nor to smiling, nor was there a significant asymmetry. Taken together, trustworthiness as a facial display is complex; even when it appears to confirm the "halo effect", its expression is not strongly left-right asymmetrical in contrast to attractiveness or smiling.