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There has been a great deal of research on emotional expression, particularly on those expressions that are most immediate, most evident, and typically most spontaneous or automatic and thus often unknown to the subject who displays them. Darwin observed the striking similarity between the emotional expressions of many mammals and humans; he thus postulated both an evolutionary explanation of the similarity and an anthropological thesis that facial expressions of emotion, such as those of anger, surprise, and fear, are universal in human beings. In the 1960s the American psychologist Paul Ekman set out to disprove Darwin’s anthropological thesis but found, ...(100 of 4917 words)