Lie Detector Tests: Do They Tell the Truth?
The theory underlying a lie detector test -- or a polygraph test, in more scientific terms -- is that lying is stressful, and that this stress can be measured and recorded on a polygraph machine. Lie detectors are called polygraphs because the test consists of simultaneously monitoring several of the suspect's physiological functions -- breathing, pulse, and galvanic skin response -- and printing out the results on graph paper.
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