An expert identifies super quick, small changes in someone's face, primarily focusing on microexpressions and subtle facial shifts, to discern true feelings. A microexpression is an involuntary, extremely brief facial display, lasting typically between 1/25 and 1/5 of a second, which reveals a genuine emotion a person may be trying to conceal. Subtle expressions are less intense but still short-lived muscle movements that indicate underlying emotion. These observations are based on the Facial Action Coding System, which categorizes individual muscle movements into "Action Units" (AUs). An expert rapidly scans specific facial regions for these AUs.
In the forehead and brows, the inner corners of the eyebrows pulling upwards (Action Unit 1) signals sadness or distress. The entire brow raising (Action Unit 2), often with th....
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