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]
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 ?
Lie detectors tests are generally not accepted as direct evidence in criminal trials, but their use varies by state.
Jason Hubble from Lie Detectors UK has offered free polygraph tests for Wallasey Labour party
On Monday, Kropp called the Reporter offices expressing her desire to take a lie detector test.
Raja for the lie detector test, which he declined," Chahal told Special CBI Judge O.
In fact, women actually reported more sexual partners than men when they were both hooked up to a lie detector and thought they had to be truthful.
In spite of facing a police investigation over the Au50million prisoner tagging fiasco, blundering G4S is in line for a state contract for lie detector testing.
"As far as Chandra is concerned, his counsel Vijay Aggarwal has informed this court that he is ready to undergo lie detector test subject to the techniques used by the investigative agency for the test...Nonetheless, I deem it fit to secure his (Chandra) presence on December 13," the judge said.
LANCE ARMSTRONG'S lawyer has revealed the cyclist might take a lie detector test in an attempt to prove he is innocent of doping allegations, but admitted few people would believe the results even if they showed he was telling the truth.
Disgraced champion Lance Armstrong may take a lie detector test in an attempt to prove he is innocent of doping allegations, his lawyer has revealed.
The Truth Machine: A Social History of the Lie Detector
DEFIANT Paddy Conroy today called for a police review of his torture conviction after claiming a lie detector test had cleared him of his criminal past.
The truth machine; a social history of the lie detector.