Paul Ekman conducted a number of studies of facial expressions and found that:

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Paul Ekman's research revealed that there are some facial expressions that are culturally universal, such as happiness, sadness, anger, fear, surprise, and disgust. These expressions are believed to be innate and biologically based, rather than learned through socialization or experience. However, other expressions may vary across cultures and can be influenced by social norms and individual experiences. Ekman's work has been influential in the study of emotions and communication, and his findings have been applied in various fields such as psychology, criminology, and healthcare.

Paul Ekman Conducted a Number of Studies of Facial Expressions