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Friday, February 02, 2007


Lie detector test redirects here. For other uses, see Lie detector test (disambiguation)
For the early automatic-signing device, see Autopen

Polygraph results are sometimes recorded on a chart recorder

A polygraph (commonly yet incorrectly referred to as a lie detector) is a device that measures and records several physiological variables such as blood pressure, heart rate, respiration and skin conductivity while the subject is asked a series of questions.

The measurements are posited to be indicators of anxiety that accompanies the telling of lies. Thus, measured anxiety is equated with telling untruths. However, if the subject exhibits anxiety for other reasons, or can control his anxiety level voluntarily, a measured response can result in unreliable conclusions.

A polygraph test is also questionably used as a psychophysiological detection of deception (PDD) examination.

So, just in case you were unsure about a polygraph.

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