Another supposed sign of lying is rapid blinking. It's true that when we become aroused or our mind is racing, there's a corresponding increase in our blinking rate. Our normal rate is about 20 blinks per minute, but it can increase to four or five times that figure when we feel under pressure. When liars are searching for an answer to an awkward question, their thought processes speed up. In this kind of situation, lying is frequently associated with blinking. But we need to remember that there are times when people have a high blinking rate, not because they're lying, but because they're under pressure. Also, there are times when liars show normal rates.
http://www.smh.com.au/articles/2003/07/11/1057783343045.html?oneclick=true
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