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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]
Jun 29, 2022 · Key points. When people lie, their bodies tend to react in detectable ways. Polygraphs measure physiological changes in the cardiovascular system, breathing, and sweating. By comparing the...
Sep 18, 2022 · Key points. The polygraph is an instrument that measures a person’s physiological changes to the questions asked. An elevated physiological response to a particular question...
Aug 5, 2004 · The instrument typically used to conduct polygraph tests consists of a physiological recorder that assesses three indicators of autonomic arousal: heart rate/blood pressure, respiration, and skin conductivity. Most examiners today use computerized recording systems.
A polygraph is a machine in which the multiple ("poly") signals from the sensors are recorded on a single strip of moving paper ("graph"). The sensors usually record: The person's breathing rate. The person's pulse. The person's blood pressure. The person's perspiration. Sometimes a polygraph will also record things like arm and leg movement.
Polygraph testing is used for three main purposes: event-specific investigations (e.g., after a crime); employee screening, and preemployment screening. The different uses involve the search for different kinds of information and have different implications.
Apr 20, 2023 · The article discusses the history, science, and legal issues surrounding the polygraph, also known as the lie detector. The polygraph measures physiological responses such as heart rate and sweating to determine whether a person is telling the truth or lying.
The polygraph is a device that seeks to accurately and reliably detect lies – an ability that humans have sought to develop throughout the centuries. However, due to its inherently subjective nature, the use of the polygraph is surrounded with controversy.
Apr 28, 2023 · Dive into the science behind lie detection, explore the factors influencing polygraph test accuracy, and debunk common misconceptions to better understand the challenges and implications of using lie detector tests.
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.
