Define Polygraph
The belief underpinning the use of the polygraph is that deceptive answers will produce physiological responses that can be.
Define polygraph. Polygraph definition an instrument for receiving and recording simultaneously tracings of variations in certain body activities. Medical instrument instrument used in the practice of medicine. A polygraph popularly referred to as a lie detector test is a device or procedure that measures and records several physiological indicators such as blood pressure pulse respiration and skin conductivity while a person is asked and answers a series of questions. A piece of electronic equipment used to try to discover if someone is telling lies 2.