Observers perceive the Duchenne marker as signaling only intensity for sad expressions, not genuine emotion - UCL Discovery
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Non-Verbal Communication and Body Language: What clues indicate whether someone's smile is natural or forced? - Quora
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A) Examples of the three smile types in the Smile Picture Set. From... | Download Scientific Diagram
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PDF) Observers perceive the Duchenne marker as signaling only intensity for sad expressions, not genuine emotion
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