Our faces also use what are called micro-expressions. These are defined as facial expressions occurring in very high emotional states that last for less than a quarter of a second. It has been argued that some people can read micro-expressions and be able to tell when others are lying. In reality, research suggests that very few people can do this with any amount of accuracy. However, as the micro-expressions are involuntary, if we video someone who is talking, we can slow the frames down to watch for certain signs that seem to correlate with lying. All aspects of the face, involving the lips,
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