A polygraph (informally referred to as a "lie detector") is a device which measures and records several physiological variables such as blood pressure, heart rate, respiration and skinconductivity while a series of questions are being asked, in an attempt to detect lies. The above measurements are posited to be indicators of anxiety that accompanies the telling of lies. Thus, measured anxiety is equated with telling untruths. However, if the subject exhibits anxiety for other reasons, a measured response can result in unreliable conclusions.
A polygraph test is also known as a psychophysiological detection of deception (PDD) examination. The original polygraph was invented by John A. Larson.
Maryland Institute of Criminal Justice Polygraph - Maryland Institute of Criminal Justice offers polygraph training accredited by the American Polygraph Association and meets basic education standards of ASTM.
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