Lie Detector

polygraph machine, device used to determine the truth of a person's statements (based on changes in the person's respiration, pulse rate, etc.)

A polygraph (commonly referred to as a lie detector) is an instrument that measures and records several physiological responses such as blood pressure, pulse, respiration and skin conductivity while the subject is asked and answers a series of questions. The polygraph measures physiological changes caused by the Sympathetic Nervous System during questioning. Within the Federal Government, a polygraph examination is also referred to as a psychophysiological detection of deception (PDD) examination.
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Lie detector n. A polygraph used to detect possible deception during an interrogation. lie detector Psychology A device that detects chest and [more]Lie detector - Community and Resources

Noun
1. a polygraph that records bodily changes sometimes associated with lying
(hypernym) polygraph
(part-meronym) galvanic skin response, GSR, psychogalvanic response, electrodermal response, electrical skin response, Fere phenomenon, Tarchanoff phenomenon

A polygraph, deceptograph, voice stress analyzer, psychological stress evaluator, or any other similar device (whether mechanical or electrical) that is used, or the results of which are used, for the purpose of rendering a diagnostic opinion regarding the honesty or dishonesty of an individual.