Polygraphy test is generally portrayed several movies of TV series as a method by using which the characters extract truth from the other person taking the witness stand. In these films, the wires are attached to the person’s body along with the machine called a lie detector. This also etched a couple of lines onto a paper. After a series of asking questions, a qualified professional will come forward to determine whether the person is telling the truth or not.
According to the science- psychology reveals that a person tends to experience various physiological responses that depend upon the situation he or she’s into. Some experts also believed that when someone tells a lie, he/she will definitely experience internal changes. These changes are generally unseen with a naked eye. Therefore, they use a devised method in order to determine or notice if the person is experiencing the internal responses.
A lie detector test is a mean by which the physiological indicators are said to be measured and recorded to notice if the person is saying the truth. While one of the most complicated models of a lie detection device tends to measure things like blood pressure, heartbeat rate, pulse and more all at once. According to some recent studies it has been found that these polygraphs tests can range u from 75 to 95% when we talk about its accuracy.
Several Usage and Benefits
Having the growing recognition as well as acceptance of a lie detector test, many people are seen utilizing it for their benefits these says. As among several uses, the most common use lies in the assistance of social research work.
Also, a lie detector is generally used by social scientist in order to determine how the nervousness of a person can affect the way he/ she answers the question. Even though, it not always used to determine the truth or a statement of a person. The device is only capable to notice and record the changes in the physiological indices. Therefore, the social experiment is done too often by conducting pre-interview or several post-interview tests.
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