2. They start blinking faster or slower than normal, so pay attention!
It is said the eyes are the window to the soul — and, apparently, to one’s lies. There are actually a few ways in which a person can spot lying through someone’s eyes, and one such method is watching how often they blink. Research has observed that people may blink five to six times in rapid succession if they are being deceptive. Normally, a person will blink five or six times every minute, or once every 10 to 12 seconds, but when they are under stress, such as in the midst of telling a lie, their rate of blinking speeds up. Some have noted that a liar’s blink rate will decrease as they are constructing their fabrication, and then will rapidly increase as they speak it out loud. So, while it is good manners to look people in the eye when speaking to them, you might also want to pay attention to what those eyes are doing during the conversation.