Daniel Langleben, a psychiatrist and neuroscientist at the University of Pennsylvania, has discovered that the brain has to perform special functions to deviate from the truth that can be traced with an MRI (NPR report here). It is harder for the brain to come up with lies than to tell the truth. Langleben says we have to think of the truth first and then decide to come up with an alternative. Some hope this may turn into a fail-proof "lie dectector" test.
The researchers have been suprised at the huge interest in the tests by people hoping to convince their lovers that they are being faithful to them. Jealousy and assuming people are lying is part of the world of sexual liberation.
The machine doesn't work however if people actually believe the lie they are telling.
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