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A polygraph instrument measures three basic bodily functions but may also measure additional (optional) features. At a minimum, the polygraph must measure (1) relative blood pressure by placing a blood pressure cuff on the upper arm, (2) electrodermal response by placing metal plates on the fingers or self-stick pads on the palm of the hands, and (3) breathing patterns by placing two soft rubber tubes across the upper and lower abdomen. Additional features may also be measured, but these are the basics. - Michael Martin (President, Global Polygraph Network)
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∙ 13y ago
A polygraph machine, commonly known as a lie detector, is not attached directly to the human body. Instead, various sensors are attached to different parts of the body. Typically, these include pneumographic tubes around the upper chest, fingerplates to measure skin conductance, and a blood pressure cuff on the arm. These sensors allow the machine to detect physiological changes that may occur when a person is lying.
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What are the advantage and disadvantages of polygraph machine?
advantage: you come to know who is lying disadvantage: the principle is based on the human skin resistance, is the person who is subjected to the test is lying confidently then it will be difficult for the lie detector circuit to catch a lie because in this case you wont be sweating or feeling nervous
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