看了美剧《Lie to me》吗？那里面的Lightman集团就是通过研究人的面部表情来判断他们是不是在撒谎，而这个判断过程中非常重要的依据就是microexpression（微表情）。
A microexpression is a brief, involuntary facial expression shown on the face of humans when one is trying to conceal1 or repress an emotion. They usually occur in high stakes situations, where people have something to lose or gain.
微表情是人在试图隐藏或者控制某种情绪时不自觉地表现出来、且持续时间非常短的一种面部表情。微表情一般会在大家历程得失、情势危急的时候出现。
Unlike regular facial expressions, few can fake a microexpression. They consist of and completely re百度竞价推广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样的是，微表情极少可以装出来。微表情可以完全反映出人类共有些厌恶、愤怒、恐惧、悲伤、幸福、惊讶与轻蔑这七种情绪特点。微表情能在1/25秒内一闪而过。