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lie detector
lie detector instrument designed to record bodily changes resulting from the telling of a lie. Cesare Lombroso, in 1895, was the first to utilize such an instrument, but it was not until 1914 and 1915 that Vittorio Benussi, Harold Burtt, and, above all, William Marston produced devices establishing correlation of blood pressure and respiratory changes with lying. In 1921 an instrument capable of continuously recording blood pressure, respiration, and pulse rate was devised by John Larson. This was followed by the polygraph (1926) of Leonarde Keeler, a refinement of earlier devices, and by the psychogalvanometer (1936) of Walter Summers, a machine that measures electrical changes on the skin. A more recent innovation are devices, first developed in 1970, called psychological stress evaluators or voice stress analyzers, which measure voice frequencies from tape recordings.
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"lie detector." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. "lie detector." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1E1-liedetec.html "lie detector." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-liedetec.html |
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lie detector
lie detector (polygraph) Electronic device that may be capable of detecting lies when used by a trained examiner. The lie detector monitors such factors as heart rate, breathing rate and perspiration, all of which may be affected when a person lies.
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"lie detector." World Encyclopedia. 2005. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. "lie detector." World Encyclopedia. 2005. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O142-liedetector.html "lie detector." World Encyclopedia. 2005. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-liedetector.html |
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lie detector
lie de·tec·tor • n. an instrument for determining whether a person is telling the truth by testing for physiological changes considered to be associated with lying.Compare with polygraph. |
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Cite this article
"lie detector." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. "lie detector." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O999-liedetector.html "lie detector." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-liedetector.html |
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