In search of a better lie detector, scientists are peering into the brain to probe the origins of deception * There is no telltale sign that reliably shows someone is a liar, although investigators have long used physical indications of arousal such as sweating and changes in heart rate.
* More recently, researchers have probed the brain for a neural signature of a fib. They found that lying activates brain regions involved in suppressing information and in resolving conflicts—such as that between the impulse to describe reality and the wish to contradict it.
* The use of brain imaging combined with physiological measures, along with a clever questioning strategy, could lead to an improved method for detecting lies.
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