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The Polygraph detects physiological changes in the body due to a psychological stimuli. When humans feel or sense danger, the autonomous nervous system, also called the sympathetic nervous system sets our body in a stage called fight, flight or freeze. This stage is a natural occurance that cannot be controlled by human beings, no matter how me may appear or try. This stage triggers the human body to undergo slight changes that can be measured by polygraph channels. These readings are then confirmed by repeating the same test and observing the results.
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