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IEEE/ICACT20210175 Slide.05        [Big Slide]	Oral Presentation
	In 1971, Paul Ekman et al.¡¯s facial expression work gave the correlation between a person¡¯s emotional state & psychological state, which described the FACS. Next in 1992, he defined 7 face expressions: Happy, Neutral, Angry, Disgust, Fear, Sad, and Surprise. They are named as 7 universal emotions and are used by most researchers.

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