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Diogenes lamp12/13/2023 In the study, Levine and his colleagues asked volunteers to commit a mock crime-stab a mannequin and rob it of $20-and then claim innocence. For one, it requires enormous resources, says James Levine, an endocrinologist at the Mayo Clinic and author of a January Nature paper that promises an alternative lie-detection method using thermal imaging technology. The team, whose study is published in the February issue of NeuroImage, doesn't claim to have identified the signature of deception, but their findings open the door to a type of lie detection independent of the nonspecific physiological variables such as blood flow, pulse and skin conductance upon which the traditional-and controversial-polygraph test relies.Īlthough fMRI scanning is a potentially powerful method of lie detection, it certainly has its drawbacks. Lying resulted in a strictly positive difference in activity, which suggests that truth is the baseline cognitive state and that "the first thing you need to do is to not tell the truth," said Langleben. What's most interesting (in terms of brain research) is the finding that deception appears to be the suppression of truth: Whereas the brain regions mentioned above were more active during lying than truth-telling, no regions were more active during truth-telling. By using a scenario with "as little nonspecific activity as possible"-the subjects simply answered "No" to the computer's questions-it is possible to correlate a task with changes in brain activity, said Langleben. Functional magnetic resonance imaging measures brain activity by detecting changes in brain blood flow and metabolic rate. When the subjects were lying, the scientists found significantly increased activity in both the anterior cingulate cortex, a section of the brain that has been linked to monitoring of errors and attention, and the prefrontal and premotor cortices, areas involved in the initiation of voluntary movement. Investigators told the volunteers to deny having the card during a computerized interrogation, telling them they could keep the $20 if they successfully "convinced" the computer that they didn't have the card. In the study, volunteers were given a sealed envelope containing a playing card and a $20 bill and asked not to disclose the identity of the card they held.
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