... at least three physiological systems, which are controlled by the autonomic nervous system. Recordings are usually included of the galvanic skin response, blood pressure, respiration and a photoelectric plethysmograph placed on one of the fingers to measure the peripheral blood flow. At this moment, the major applications of polygraph are in the criminal and industrial contexts. In the criminal context, the police, together with other techniques, to help connect suspects to a specific crime use polygraphs. The industrial application refers to the screening of employees or prospective employees by their current or prospective employers. This application formed the main staple of American polygraphic activity and was quite common in Canada. However, some opponents disagreed with using polygraph as a lie detector. Purportedly telling lie causes fear or anxiety, and this fear or anxiety is associated with arousal that will be recorded on the polygraph. However, Saxe (1991) argued that a ...

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