lie detector

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detector

 [de-tek´ter]
a device by which an object or condition can be discovered.
image detector any recording medium used in radiology, such as film or a cathode ray tube.
lie detector polygraph.

pol·y·graph

(pol'ē-graf),
1. An instrument to obtain simultaneous tracings from several different sources; for example, radial and jugular pulse, apex beat of the heart, phonocardiogram, electrocardiogram. The ECG is nearly always included for timing.
2. An instrument for recording changes in respiration, blood pressure, galvanic skin response, and other physiologic changes while the person is questioned about some matter or asked to give associations to relevant and irrelevant words; these physiologic changes are presumed to be indicators of emotional reactions, and thus whether the person is telling the truth. Synonym(s): lie detector
[poly- + G. graphō, to write]

lie detector

Etymology: AS, leogan, untruth; L, detegere, to uncover
an electronic device or instrument used to detect lying or anxiety in regard to specific questions. A commonly used lie detector is the polygraph recorder that senses and records pulse, respiratory rate, blood pressure, and perspiration. Some experts hold that certain patterns indicate the presence of anxiety, guilt, or fear-emotions that are likely to occur when the subject is lying.
Commonly called a lie detector. An instrument that measures and records a test subject’s sympathetic nervous system responses—pulse, blood pressure, galvanic skin conductance due to sweating, breathing rhythms, and temperature—to a series of questions, on the premise that true and false answers produce distinctive patterns of response.

lie detector

Psychology A device that detects chest and abdominal movement during respiration, heart rate, BP, and galvanic skin conductance due to sweating. See Polygraph test.

pol·y·graph

(pol'ē-graf)
1. An instrument for obtaining simultaneous tracings from several different sources (e.g., radial and jugular pulse, apex beat of the heart, phonocardiogram, electrocardiogram). The electrocardiogram is nearly always included for timing.
2. An instrument for recording changes in respiration, blood pressure, galvanic skin response, and other physiologic changes while the subject is interviewed or asked to give associations to relevant and irrelevant words; the physiologic changes are presumed to be emotional reactions, and thus indicative of whether the subject is telling the truth.
Synonym(s): lie detector.
[poly- + G. graphō, to write]

lie detector

A popular terms for the polygraph—a collection of devices used to monitor and record various parameters of the body, such as the pulse rate, the blood pressure, the evenness and rate of breathing and the moistness, and hence the electrical resistance, of the skin. These vary with the state of the emotions and the results can be thought to cast light on significance to the subject of certain questions or statements. Emotional responses do not, however, necessarily indicate that the subject is lying or concealing the truth. Lie detection is a function of the interpreter, not the machine and it is the sensitivity, intelligence, imagination and experience of the operator that determines the forensic value of the procedure. This should always be challenged if lie detector evidence is used in court.
References in periodicals archive ?
24, 2015 /PRNewswire-iReach/ -- The founders of UK Lie Detector Test, a company that offers lie detector tests UK corporate and private clients can count on, are pleased to announce the launch of their new company and website.
The questions were devised by world-renowned tester Ben Bladok, the US-based expert who is seen as the Godfather of lie detector tests.
If you know there is a lie detector on the other end of the phone, I'm pretty sure most people would think twice.
They told Wilkins that the best chance of clearing his name was to submit to examination on an oracular device that had come to be known in the tabloid press as "the lie detector.
THEY have a unique way of fostering good working relations in Serbia: companies give their employees lie detector tests.
Home Secretary David Blunkett announced yesterday that he wants to use satellite tracking devices and lie detectors, or polygraphs, to keep tabs on sex offenders and other criminals.
On his lie detector plans,Mr Blunkett said: ``We are all a bit sceptical because we've all been brought up with the spy films and the way in which the KGB are allegedly able to train people to avoid them.
POLICE would use lie detectors and satellite tracking to keep tabs on sex offenders released from prison, under plans being unveiled by the government today.
A criminologist by training, Attafuah said lie detectors were not foolproof and rarely used in the criminal justice systems around the world.
Traditional lie detectors, like the polygraph, search for signs of emotional stress--increased pulse rate, blood pressure, breathing, and sweat--that are common symptoms of lying.
US-STYLE lie detectors could soon be used to root out traitors from MI5, it emerged today.