Systolic blood pressure symptoms of deception.

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Abstract
Investigated galvanic effects of hidden ideas, in terms of changes in systolic blood pressure (b.p.), resulting from an effort to hide the truth or the deceptive consciousness. Data was analyzed in order to determine the physiological and psychological mechanisms involved. Four factors determine the arterial pressure at any given time: heart-beat; constriction of arteries; changes in elasticity of arterial walls; and loss of blood. The b.p. measurements were taken with a 'Tycos' sphygmomanometer. Four series of experiments were conducted. Results reveal that the behavior of the b.p. acted as a test of consciousness of an attitude of deception. The significant curve of deception differentiated a story whose foundation was false, from the story mostly true, but containing one or two substantial lies. Concluded that the b.p. record during testimony might be made practical use of as an indicator of deception. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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