A micro expression is a brief, involuntary facial expression shown on the face of humans according to emotions experienced. Micro expressions occur when a person is consciously trying to conceal all signs of how they are feeling, or when a person does not consciously know how they are feeling.
Emotions are defined as a complex pattern of changes, including physiological arousal, feelings, cognitive processes, and behavioral reactions, made in response to a situation perceived to be personally significant.
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