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 ?
Earlier in April also, Tytler refused to undergo a lie-detector test in connection with the case.
Last night, Five said the Trisha show stood by their lie-detector results.
Any testing which is attempted under the conditions just described is unfair to the lie-detector technique and to the examiner as well.
Maybe it's the city's politicians, not its police officers, who need lie-detector tests.
Jones' lawyer Rich Nicholls said in a statement: ``Marion Jones took, passed and made public a lie-detector test, which confirmed what she has said publicly, what her then coach has reportedly said and what her doctor reported - she has never, ever used performance-enhancing drugs.
David gest has challenged estranged wife Liza Minnelli to take a lie-detector test in his attempt to prove she battered him during drunken rages.
The research, carried out by Prof Don Grubin, showed that in a third of cases criminals had positively altered their behaviour because of the lie-detector tests.
After the Los Angeles Police Department's Rampart Division scandal, the city began requiring every police recruit to undergo a lie-detector test, but the LAPD does not have enough personnel to conduct the tests, leading to a backlog of 500 to 600 recruits in the application process.
The 49-year old British-American singer wants to be a guest on Jeremy's ITV show and subject to a lie-detector test to prove that she fell pregnant during her romance with the 53-year old music mogul in 2009, but terminated the pregnancy, the Daily Star reported.
But bosses may have the last laugh - using lie-detector technology to spot workers who are fibbing when they phone in sick.
JK ROWLING'S cousin passed a lie-detector test last night over claims he's the "real" Harry Potter.
Court documents also show that Demirdjian recently took a lie-detector test.