Lying activates tell-tale areas of the brain that can be tracked using functional magnetic resonance imaging (fMRI), according to scientists who believe the technique could replace traditional lie detectors.
Conventional detectors, or polygraphs, are extremely controversial. Proponents of the polygraph argue that it measures the body's physiological responses to stress induced by lying. Trained operators can supposedly match spikes in respiration, blood pressure and sweating with false answers.
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