A Comparison of Physiological Indices in Detection Oe Deception

Physiological measures—breathing amplitude (BA), breathing cycle time (BCT), galvanic skin response (GSR), skin potential response (SPR), systolic blood pressure (BP), oxygen saturation level (O 2 S), finger volume (FV), and pulse volume (PV)—were compared with respect to their relative efficiency in discriminating deception in a lie detection experiment. Thirty S s were tested. Stimuli consisted of personal words and neutral words made relevant in the context of a mock crime paradigm. Only GSR, SPR, and FV consistently discriminated better than chance, with GSR and SPR significantly superior to FV. BA and O 2 S yielded some evidence of discrimination, but were inconsistent across stimulus material.