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Methods of detecting lies and other forms of deception

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are based on the fact that emotions have an impact on our body’s physiological responses, such as heart rate.

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In addition, our nonverbal cues, like facial expressions, bodily movements

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posture, and gestures, often betray our emotional state.

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Many police interrogators believe that they can spot liars by watching for movements signaling strong emotion

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such as trembling hands, twitching fingers, “shifty eyes,” or frequent blinking.

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Other experts have developed lists of classic “deception gestures”

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such as putting a hand over the mouth or rubbing the nose.