Polygraph’s revival may be about truth rather than lies - The Guardian
Polygraph’s revival may be about truth rather than lies - The Guardian Polygraph’s revival may be about truth rather than lies - The Guardian Posted: 21 Jan 2020 12:00 AM PST Telling lies is stressful. That's the basic logic of a polygraph test: that the stress of deceiving others will manifest itself through fleeting physical responses that may be imperceptible to another person but can be measured by a machine. Typically, a polygraph records blood pressure, galvanic skin response (a proxy for sweat), breathing and pulse rate. There is a fairly standard protocol for the lie detector examination. The examiner will mix specific questions relevant to a case – "Did you commit a robbery on 29 March?" – with a series of control questions. Crucially, the control questions are also designed to be anxiety-inducing – for instance: "Have you ever stolen from a friend?" Along the way, the subject will be reminded that the machin...