Forma, Vol. 15 (No. 2), pp. 187-192, 2000

Asymmetric Expression between Right and Left Hemiface of Human

Toshiaki Takeda, Wakako Iwamura, Miho Toyo'oka, Hiromi Nakano, Yukie Akazawa and Eriko Suruga

Laboratory of Physiological Sciences, Jichi Medical School, School of Nursing, Minamikawachi-machi, Tochigi 329-0498, Japan

(Received December 15, 1999; Accepted March 8, 2000)

Keywords: Human Face, Right and Left Asymmetry, Emotional Expression, Cerebral Hemisphere

Abstract. Using image processing technique and newly developed cognitive evaluation method, asymmetry between right and left hemiface of human concerning the emotional function could be detected. Right-left asymmetry in emotional expression could be quantitatively evaluated by indices of richness and plainness scores. Most right-handed peoples (8 out of 10) showed positive and high richness scores indicating that the rich emotional expression is found in the left hemiface higher degree than in the right hemiface. The relevance of this result to the laterality of cerebral hemispheres in emotional function was discussed.

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