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In this video I discuss the importance of emotional expression in social interaction and how we use signals from others to gauge their emotional states. This also relates to display rules for when it's appropriate to express certain emotions and attempts we make to deceive others by intensifying, de-intensifying, masking, or neutralizing our facial expressions. Next I discuss potential cues for assessing the authenticity of an emotional expression, including morphology, symmetry, duration, and temporal patterning. Lastly I consider other techniques for assessing when someone is telling the truth and the accuracy of polygraphs for detecting lying via physiological changes.

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