Asymmetry in Facial Expressions as a Function of Social Skills

Masashi KOMORI  Hiroko KAMIDE  Satoru KAWAMURA  Chika NAGAOKA  

IEICE TRANSACTIONS on Information and Systems   Vol.E96-D   No.3   pp.507-513
Publication Date: 2013/03/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E96.D.507
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on Face Perception and Recognition)
Category: Face Perception and Recognition
facial expression,  facial asymmetry,  social skills,  landmark-based 3D shape analysis,  

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This study investigated the relationship between social skills and facial asymmetry in facial expressions. Three-dimensional facial landmark data of facial expressions (neutral, happy, and angry) were obtained from Japanese participants (n = 62). Following a facial expression task, each participant completed KiSS-18 (Kikuchi's Scale of Social Skills; Kikuchi, 2007). Using a generalized Procrustes analysis, faces and their mirror-reversed versions were represented as points on a hyperplane. The asymmetry of each individual face was defined as Euclidian distance between the face and its mirror reversed face on this plane. Subtraction of the asymmetry level of a neutral face of each individual from the asymmetry level of a target emotion face was defined as the index of “expression asymmetry” given by a particular emotion. Correlation coefficients of KiSS-18 scores and expression asymmetry scores were computed for both happy and angry expressions. Significant negative correlations between KiSS-18 scores and expression asymmetries were found for both expressions. Results indicate that the symmetry in facial expressions increases with higher level of social skills.