Research using the FACS suggests that anger is the most facially complex emotion because people need information from all parts of the face to accurately recognize it.

Question

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Research using the Facial Action Coding System (FACS) has shown that anger is the most facially complex emotion, as it involves the activation of multiple facial muscles across the whole face, and people rely on information from all parts of the face to accurately recognize it.

Research Using the FACS Suggests That Anger Is the Most