lie detector

(redirected from Lie-detector)
Also found in: Dictionary, Thesaurus, Medical, Legal.

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.

Although the lie detector is used in police work, the similarity of physical changes caused by stress and such emotional factors as feelings of guilt to changes caused by lies has made its evidence for the most part legally unacceptable. An assessment of such devices by National Research Council (an arm of the National Academy of SciencesNational Academy of Sciences,
with headquarters in Washington, D.C., a private organization of leading American scientists and engineers devoted to the furtherance of science and its use for the general welfare.
..... Click the link for more information.
) found that they also were too unreliable to be used in screening for national security purposes, but they are widely used for such purposes nonetheless, sometimes with inconsistent results from one government agency to another. The use of lie detectors to screen employees and job applicants is highly controversial.

Bibliography

See E. B. Block, Lie Detectors, Their History and Use (1977); C. Gugas, The Silent Witness (1979); D. T. Lykken, A Tremor in the Blood (1981); K. Alder, The Lie Detectors: The History of an American Obsession (2007).

lie detector

[′lī dī‚tek·tər]
(engineering)
An instrument that indicates or records one or more functional variables of a person's body while the person undergoes the emotional stress associated with a lie. Also known as polygraph; psychintegroammeter.
References in periodicals archive ?
Tytler and arms dealer Abhishek Verma were earlier asked by the court to appear in person or file an affidavit stating if they wanted to undergo lie-detector test or not.
Summary: Andrew Strauss could only give a cautious endorsement of the MCC's suggestion that lie-detectors may help fight corruption in cricket.
Last night, Betty's oldest daughter, Audrey Lochhead, 38, of Stepps, Glasgow, said they had commissioned a second lie-detector test which their mum passed with flying colours.
To date, Mr Conte has not taken a lie-detector test.
Roger Bingham, of human rights group Liberty, said: "The use of lie-detector equipment and voice analysis without customers' knowledge is questionable".
Most lie-detector errors and inconclusive test results are attributable to the incompetency of the examiner conducting the test.
MANAGEMENT should be aware of federal, state and local legal limitations of using safeguards such as lie-detector tests.
I'd have to think about the arguments (for lie-detector tests) one side and another first.
David Gest challenged estranged wife Liza Minnelli yesterday to take a lie-detector test in his bid to prove that she battered him during drunken rages.
If there's anyone in desperate need of a lie-detector, it's Hahn, who has spread every far-fetched fabrication about secession imaginable.
The lie-detector test was commissioned by his lawyer, Abbe Lowell, who said the probability of deception was one-hundredth of one per cent.
VLADIMIR ROMANOV last night revealed he has introduced lie-detector tests at Hearts.