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A polygraph, often incorrectly referred to as a lie detector test, [1] [2] [3] is a junk science [4] [5] [6] 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. [7]
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Lie detection is a consistently controversial topic -- how can a machine tell truth from deception? Does everyone have the same physiological reaction when telling a lie? If so, how can some people "beat the box"? Find out what these devices measure and if they really can detect lies.
The goal of a lie detector is to see if the person is telling the truth or lying when answering certain questions. When a person takes a polygraph test, four to six sensors are attached to him. A polygraph is a machine in which the multiple ("poly") signals from the sensors are recorded on a single strip of moving paper ("graph").
Lie detector, instrument for recording physiological phenomena such as blood pressure, pulse rate, and respiration of a human subject as he answers questions put to him by an operator; these data are then used as the basis for making a judgment as to whether or not the subject is lying.
Getty Images. Dr Sebastian Speer says that using MRI scans he can tell if a person is lying by looking at their brain. At Erasmus University in Rotterdam, Netherlands, Dr Sebastian Speer and his...
Aug 5, 2004 · Lie detector tests have become a popular cultural icon — from crime dramas to comedies to advertisements — the picture of a polygraph pen wildly gyrating on a moving chart is readily recognized symbol.
Jun 29, 2022 · How Do Polygraphs Work? A brief review of how lie detectors operate and how they are utilized. Posted June 29, 2022 | Reviewed by Kaja Perina. Key points. When people lie, their bodies tend...
