Abstract
A human being laughs in every day life when happy, and a facial expression changes unconsciously. It is thought that the expression has close relation to emotion. The facial expression is more intelligibly than the expression by word, and can convey a delicate nuance when introducing emotion. Communication with a different foreigner is possible by a facial expression and a gesture. In this way, the role that a facial expression serves as by communidation is very big. The aim of this study is to improve a mental condition by the intentionally modified facial expression. The final aim is application to a field of the medical welfare, hi this article, quantitative evaluation method is utilized for the evaluation of emotion by using electroencephalogram. The frequency fluctuation of brain waves which is said that individual difference is small is focused. The first step of this article, the evaluation method of emotion is proposed. And next step, smile which typically pleasant is focused. Optical smile induced pleasant emotion is found.
