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A microexpression is a 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 microexpressions. However, no one can fake above a certain extent. Despite claims of effectiveness, many in the field of psychology regard using microexpressions with great skepticism since no peer-reviewed journal articles have been published on their use in lie-detection.

Microexpressions express the seven universal emotions: disgust, anger, fear, sadness, happiness, surprise, and contempt. They can occur as fast as 1/25 of a second.

Unless indicated otherwise, the text in this article is either based on Wikipedia article "Microexpression" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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