看了美劇《Lie to me》嗎？那里面的Lightman集團就是通過研究人的面部表情來判斷他們是不是在撒謊，而這個判斷過程中非常重要的依據就是microexpression（微表情）。

A microexpression is a brief, involuntary facial expression shown on the face of humans when one is trying to conceal^{1 or repress an emotion. They usually occur in high stakes situations, where people have something to lose or gain.}

微表情是人在試圖隱藏或者控制某種情緒時不自覺地表現出來、且持續時間非常短的一種面部表情。微表情一般會在大家歷程得失、情勢危急的時候出現。

Unlike regular facial expressions, few can fake a microexpression. They consist of and completely re百度競價推廣ble the seven universal emotions: disgust, anger, fear, sadness, happiness, surprise, and contempt. Microexpressions can occur as fast as 1/25 of a second.

跟普通的面部表情不一樣的是，微表情極少可以裝出來。微表情可以完全反映出人類共有些厭惡、憤怒、恐懼、悲傷、幸福、驚訝與輕蔑這七種情緒特點。微表情能在1/25秒內一閃而過。