![]() ![]() The physiological systems that a polygraph focuses on are heart rate, blood pressure, respiratory rate, and how much a person sweats. When a person feels this way they exhibit difficult to detect involuntary physiological changes that can, theoretically, be detected with a polygraph. ![]() It is this fear and guilt that produces the anxiety and nervousness. This stems from the idea that most people either feel bad that they are lying or are afraid that they will get caught or will be in trouble if they lie. Polygraphs are used under the theory that most people do not lie or deceive without some feelings of anxiety or nervousness. Despite its colloquial name, the polygraph does not detect lies and most polygraph examiners will say that they do not test specifically for lies, but for deceptive reactions. What is a polygraph? A polygraph, most commonly referred to as a lie detector, is a machine that is used by law enforcement to test the physiological responses of individuals to certain questions. ![]()
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