More Info About lie detector

some brief exolanation about lie detector

Lie detection is the practice of determining whether someone is lying. Activities of the body not easily controlled by the conscious mind are compared under different circumstances. Usually this involves asking the subject control questions where the answers are known to the examiner and comparing them to questions where the answers are not known. Critics claim that lie detection by use of polygraphy has no scientific validity because it is not a scientific procedur ....etc

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Lie detector tests have become a popular cultural icon from crime dramas to comedies to advertisements the picture of a polygraph pen wildly gyrating on a moving chart is readily recognized symbol. But, as psychologist Leonard Saxe, PhD, (1991) has argued, the idea that we can detect a person's veracity by monitoring psychophysiological changes is more myth than reality. Even the term lie detector, used to refer to polygraph testing, is a misnomer. So-called lie detection involves inferring deception through analysis of physiological resp ....etc

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brain wave lie detector ppts

Lie detection, also referred to as deception detection, uses questioning techniques along with technology that record physiological functions to ascertain truth and falsehood in response. It is commonly used by law enforcement and has historically been an inexact science. There are a wide variety of technologies available for this purpose.The most common and long used measure is the polygraph, which the U.S. National Academy of Sciences states, in populations untrained in countermeasures, can discriminate lying fro ....etc

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This is a false capture circuit or a Lie detector. The basic principle of human skin resistance. While dry skin is a resistance of about 1 Mega ohm but if the moisture resistance of the skin is reduced. When the body is excited or scared or not sure that the skin is wet than usual.

The operation of the circuit is a circuit of R1 and R2 divide the line voltage and the probe used to measure the resistance of the skin, which is parallel to R2.So voltage drop across R2 is based on the resistance of the skin With is whether the skin resistance of ....etc

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