A number of facial expressions and associated reactions may indicate that someone lied to you. Some are caused by nervousness, others by chemical reactions and others by physical reactions.
It is best to observe someone for a little while or ask innocuous questions to see what their usual reactions are, Then, if he presents several misleading indicators when you ask more pointed or suggestive questions, and these are not the ones he has already executed, you can be sure that he is probably lying.
Here are some things you can do to tell if someone is lying:
Look at their eyes
It's a physiological reaction to feeling uncomfortable or trapped in questions you do not want to answer. It is a step backwards when people had to look for an emergency exit when they feared to be in a dangerous situation, such as facing a human being or the animal opponent.
Keep an eye on the fast flicker
A person usually blows five or six times a minute, or once every 10 or 12 seconds when stressed, for example, when a person knows he's lying, he can blink five or six times quickly.
Count how long someone closes their eyes
When a person turns a blind eye for a second or two, it may indicate that he has lied to you, since it is a type of defense mechanism. Normally, a person blinks at a speed of 100 to 400 milliseconds, or 0.10 to 0.40 seconds.
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