Differentiation of Deception as a Psychological Process: A Psychophysiological Approach

Abstract

If psychophysiology is the study or differentiation of psychological processes by means of physiological measures, then the experimental demonstration of deception as a psychophysiological phenomenon requires a comparison of physiological responses to two conditions (experimental and control) which differ only with respect to deception. To this end, the Differentiation‐of‐Deception Paradigm controls for differential question significance and frequency of occurrence. Thirty‐two subjects were tested in this paradigm, with the skin conductance response as the dependent variable. We examined, within subjects: a) the basic deception comparison which contrasted relatively neutral autobiographical questions answered deceptively with those answered honestly, and b) the mode of answering, which was either an immediate answer to the question (conventional method) or an answer delayed by 10 seconds. The deception phenomenon (greater responding to deceptive relative to honest trials) emerged significantly (and nondifferentially) to both the immediate and delayed questions, but (perhaps because of response interference) not when responding was measured immediately following the delayed answers. Future research should vary other conditions and measure additional dependent variables with the aim of investigating possible psychological and physiological mechanisms, as well as extending the deception phenomenon beyond its present electrodermal form. Copyright © 1988, Wiley Blackwell. All rights reserved