Test of a Mock Theft Scenario for Use in the Psychophysiological Detection of Deception: IV
Final rept. Dec 1997-Jan 2001
DEPARTMENT OF DEFENSE POLYGRAPH INST FORT JACKSON SC
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The study described in this report is a continuation of research to develop a participant manipulation to serve as a standard procedure for laboratory psychophysiological detection of deception PDD research. The manipulations used in this study were similar to one reported by Kircher 1983 of the University of Utah. In Experiments 1 and 2 two groups of 16 participants who were assigned to be either guilty or innocent of the mock theft of a ring were tested using the Zone Comparison Test, a PDD examination taught at the Department of Defense Polygraph Institute. Written and audio taped instructions were provided to all participants. All participants were promised 50 for participating in the study and an additional 25 if they were classified as nondeceptive following a PDD examination. Three human examiners evaluated each of the 32 sets of polygraph charts. For Experiment 1, the decisions made by examiners were correct 55 of the time, incorrect 23 of the time, and no opinion 22 of the time. Experiment 2 was identical to Experiment 1 except that participants completed two screening questionnaires prior to testing. Participants who did not complete the questionnaires satisfactorily were excluded from the study. For Experiment 2, the decisions made by examiners were correct 66 of the time, incorrect 10 of the time, and no opinion 24 of the time. It is concluded that the procedures used to manipulate participants in Experiments 1 and 2 did not meet the necessary requirements for a standard procedure, but that the screening procedure used in Experiment 2 did result in higher accuracy.
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