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I would like to propose to remove the 'factual accuracy is disputed' message. In the current version the claims that this message referred to have been removed. Stringfellows (talk) 11:53, 26 June 2017 (UTC)
The following is WP:OR and needs reliable secondary sources
Principle and origins
Lippold discerned that an 8–12 Hz range physiological tremor was associated with the contraction of human muscles indicated a connection between psychological stress and its effect on the human body.[third-party source needed] On September 5, 1972, three retired U.S. Army officers—Allan D. Bell Jr., Wilson H. Ford, and Charles R. McQuiston—filed a U.S. patent under their corporation name, Dektor Counterintelligence and Security, Inc. for their “physiological response analysis method and apparatus.”. Bell's expertise was in counterintelligence, Ford's was in electronics, and McQuiston's was in polygraphy. Ford had invented an electronic device that utilized the theory of Lippold, Halliday, and Redfearn in which he tape-recorded the human voice, slowed it down to one-third or one-fourth its normal rate, and fed it through several low pass filters which then fed the signal into an EKG strip chart recorder. The strip chart recorder then made chart tracings on heat-sensitive paper. Their Psychological Stress Evaluator (PSE) was the first commercially available VSA. According to Allan Bell Enterprises, "All lie-detection examinations or evaluations are predicated upon the fact that telling a significant lie will produce some degree of psychological stress. Psychological stress, in turn, causes a number of physiological changes.".