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10 Ways to Catch a Liar

Experts have 10 tips that can let you know if someone isn't telling you the whole truth.

Tip No. 4: Look for Insincere Emotions

"Most people can't fake smile," says O'Sullivan. "The timing will be wrong, it will be held too long, or it will be blended with other things. Maybe it will be a combination of an angry face with a smile; you can tell because their lips are smaller and less full than in a sincere smile."

These fake emotions are a good indicator that something has gone afoul.

Tip No. 5: Pay Attention to Gut Reactions

"People say, 'Oh, it was a gut reaction or women's intuition,' but what I think they are picking up on are the deviations of true emotions," O'Sullivan tells WebMD.

While an average person might not know what it is he's seeing when he thinks someone isn't being honest and attribute his suspicion to instinct, a scientist would be able to pinpoint it exactly -- which leads us to tip no. 6.

Tip No. 6: Watch for Microexpressions

When Joe Schmo has a gut feeling, Paul Ekman, a renowned expert in lie detection, sees microexpressions.

"A microexpression is a very brief expression, usually about a 25th of a second, that is always a concealed emotion," says Ekman, PhD, professor emeritus of psychology at the University of California Medical School in San Francisco.

So when a person is acting happy, but in actuality is really upset about something, for instance, his true emotion will be revealed in a subconscious flash of anger on his face. Whether the concealed emotion is fear, anger, happiness, or jealousy, that feeling will appear on the face in the blink of an eye. The trick is to see it.

"Almost everyone -- 99% of those we've tested in about 10,000 people -- won't see them," says Ekman. "But it can be taught."

In fact, in less than an hour, the average person can learn to see microexpressions.

Tip No. 7: Look for Contradictions

"The general rule is anything that a person does with their voice or their gesture that doesn't fit the words they are saying can indicate a lie," says Ekman. "For example, this is going to sound amazing, but it is true. Sometimes when people are lying and saying, 'Yes, she's the one that took the money,' they will without knowing it make a slight head shake 'no.' That's a gesture and it completely contradicts what they're saying in words."

These contradictions, explains Ekman, can be between the voice and the words, the gesture and the voice, the gesture and the words, or the face and the words.

"It's some aspect of demeanor that is contradicting another aspect," Ekman tells WebMD.

Tip No. 8: A Sense of Unease

"When someone isn't making eye contact and that's against how they normally act, it can mean they're not being honest," says Jenn Berman, PhD, a psychologist in private practice. "They look away, they're sweating, they look uneasy ... anything that isn't normal and indicates anxiety."

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