#4. Rapid blinking
A person usually blinks once every 10-12 seconds making it about 5-6 times in a minute. But when someone is stressed or know they are lying, they are likely to blink more, maybe 5-6 times successively. Another thing that they might do is that they might close their eyes for about one or two seconds. This is a kind of defense mechanism where people try to block out the fact that they are lying.
#5. Looking up to their right
A normal right-handed person will look up and then towards left if you ask him something that he is supposed to recall from his memory. However, if he looks up and then towards right, he is basically using his imagination and inventing an answer. This is opposite in case of left-handed people. Most people will usually stare straight ahead when they are trying to recall a visual memory.
#6. Repetition of words or phrases
People will often repeat certain phrases when they are lying as they are trying to validate what they are saying not just to you but to themselves as well. However, this technique can also buy them some time to come up with something more innovative.