Micro-expressions are facial expressions that flash on a person's face for a fraction of a second and reveal the person's true emotion, underneath the lie. Some people may be naturally sensitive to them but almost anybody can train themselves to detect these micro-expressions.


Typically, in a person who is lying, his or her micro-expression will be an emotion of distress, characterized by the eyebrows being drawn upwards towards the middle of the forehead, causing short lines to appear across the skin of the forehead.;
, People tend to touch the nose more when lying and a great deal less when telling the truth.This is perhaps due to a rush of adrenaline to the capillaries in the nose, causing the nose to itch.A lying person is more likely to cover his or her mouth with a hand or to place the hands near the mouth, almost as if to cover the lies coming forth. If the mouth appears tense and the lips are pursed, this can indicate distress., You can usually tell if a person is remembering something or making something up based on eye movements. When people remember details, their eyes move up and to the left if they are left-handed. When right-handed people make something up, their eyes move up and to the right. The reverse is true of left-handed people. People also tend to blink more rapidly ("eye flutter") as they're telling a lie. More common in men than in women, another tell of a lie can be rubbing the eyes.Watch the eyelids. These tend to close longer than the usual blink when a person sees or hears something he or she doesn't agree with.However, this can be a very minute change, so you will need to know how the person blinks normally during a non-stressful situation for accurate comparison. If the hands or fingers also go to the eyes, this may be another indicator of trying to "block out" the truth.Be careful about assessing the truthfulness of someone's statement based on eye movements alone. Recent scientific studies have cast doubt on the idea that looking a certain direction can help pinpoint someone who is lying.Many scientists believe that eye directionality is a statistically poor indicator of truthfulness.
 Contrary to popular belief, a liar does not always avoid eye contact.Creatures may naturally break eye contact and look at non-moving objects to help them focus and remember. Liars may deliberately make eye contact to seem more sincere; this can be practiced to overcome any discomfort, as a way of "proving" that truth is being told.


Indeed, it has been shown that some liars tend to increase the level of eye contact in response to the fact that investigators have often considered eye contact as a tell.Clearly, only use eye contact aversion as one indicator in a general context of increasing distress when being asked difficult questions.
Look for micro-expressions.
Look for nose touching and mouth covering.
Notice the person's eye movements.
Do not use eye contact or lack of it as a sole indicator of truthfulness.
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