A Closer Look at the Lie Detector Test

Who hasn’t watched a crime movie or drama without seeing a polygraph? The lie detector test and the polygraph machine have become all too familiar in today’s pop culture. They are no longer just used in criminal investigations but also in movies, dramas, and even game shows. A lie detector test, also known as a polygraph, is a device used to measure, detect, and record physiological indicators such as skin conductivity, pressure, respiration, and pulse while a person is subjected to several questions prepared beforehand. It was invented by a University of California-Berkeley medical student John Augustus Larson and a Berkley police officer in 1921. The Scientific Basis for Polygraph According to a research conducted by Raymond Nelson in 2015, there is evidence to prove the validity of polygraph tests in terms of screening and diagnostic contexts. Nelson furthermore asserted that polygraph tests combine physiological responses and response differences depending

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How reliable are the lie detectors?

That question is almost inevitable while one writes about polygraphs. While some claimed that a certain percentage of those who failed the lie detection test actually confessed to those crimes subsequently, statistics have shown that their use can be relied on. Lie detectors have proved to be about 80 to 99% effective according to recent studies. Owing to the consistency in the results, they have proved to be reliable and that can be validated. Since they are based on the fact that the stress levels in an individual escalate when they are giving lies, critics argue that one may be coached on how to overcome these stress levels. But let’s face it; you cannot control your brain activity in such moments, can you? That’s just human nature! Just like one doctor cannot look at the x-ray and see a problem, while a more experienced one will see, so it goes

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