AP PSYCHOLOGY

Detailed explanation-1: -Micro expressions are facial expressions that occur within a fraction of a second.

Detailed explanation-2: -A micro expression is an involuntary facial expressions that lasts less than half a second. These expressions are often missed altogether but they reveal someones true feelings about what they are saying.

Detailed explanation-3: -Sweating or dryness: Autonomic nervous system changes can trigger liars to sweat in the T-area of the face (upper lip, forehead, chin and around the mouth) or have dryness in the mouth and eyes-the person might excessively blink or squint, lick or bite their lips or swallow hard, according to Glass.

Detailed explanation-4: -Micro Expressions When lying, the face often contains two messages-what the liar wants to show and what the liar wants to conceal. Often, these hidden emotions leak in the form of a micro expression, a brief (half a second or less) involuntary facial expression revealing true emotion.