What is Polygraph

A polygraph /lie detector measures and records several physiological indices such as blood pressure, pulse,respiration, and skin conductivity while the subject is asked and answers a series of questions. The belief underpinning the use of the polygraph is that deceptive answers will produce physiological responses that can be differentiated from those associated with non-deceptive answers; the polygraph is one of several devices used for lie detection.

 

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