It has long been speculated that there exist cues on human face that allow observers to make reliable judgments of others' personality traits. However, direct evidences of association between facial shapes and personality are missing. This study assessed the personality attributes for 834 Han Chinese volunteers (405 males and 429 females) utilizing the five-factor personality model (the 'Big Five' model), and collected their neutral 3D facial images. Dense anatomical correspondence was established across the 3D facial images to allow high-dimensional quantitative analyses on the face phenotypes. Two different approaches, Composite Partial Least Square Component (CPLSC) and principle component analysis (PCA) were used to test the associations between the self-tested personality scores and the dense 3D face image data. Among the five personality factors, Agreeableness and Conscientiousness in male, and Extraversion in female were significantly associated to specific facial patterns. The personality-related facial patterns were extracted and their effects were extrapolated on simulated 3D facial models.
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