Nano-expression


a nano-expression is a very brief, involuntary facial expression shown on the face of humans according to emotions experienced. they usually occur in high-stakes situations, where people have something to lose or gain. unlike regular facial expressions, it is difficult to fake nanoexpressions.
nano-expressions express seven universal emotions as microexpressions: disgust, anger, fear, sadness, happiness, surprise, and contempt. they can occur as fast as 1/05 to 1/14 of a second.

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