Polygraph (Psychology)

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  • An electronic instrument that records multiple channels of arousal and has been used mainly in the detection of deception. It measures and records physiological responses such as blood pressure, pulse, and respiration while the subject is asked a series of questions. It is based on the assumption that false responses will produce changes in the sympathetic nervous system that will be detectable, given that they will vary from baseline levels of physiological arousal. For more information, see Gale (1998).

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