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NCJRS Abstract

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NCJ Number: 82947 Find in a Library
Title: Effects of Information and Practice on Detection of Deception
Author(s): L I Rovner; D C Raskin; J C Kircher
Date Published: 1978
Page Count: 5
Sponsoring Agency: National Institute of Justice/
Rockville, MD 20849
Sale Source: National Institute of Justice/
NCJRS paper reproduction
Box 6000, Dept F
Rockville, MD 20849
United States of America
Document: PDF
Type: Report (Study/Research)
Language: English
Country: United States of America
Annotation: This paper describes a research project involving the physiological detection of deception (PDD) technique and the effectiveness of the control-question (CQ) technique in polygraph examinations.
Abstract: Seventy-two male subjects were recruited from the local community to participate in the study. Thirty-six guilty subjects received taped instructions to steal a ring from a secretary's office, and 36 innocent subjects were simply informed that a theft had been committed. All subjects were instructed to deny having committed the theft when they were administered a CQ polygraph test. Prior to that test, 24 subjects in the control group (12 innocent and 12 guilty) simply waited in a room for 40 minutes. Twenty-four subjects in the information group received detailed information about the polygraph, the CQ test, pertinent physiological responses, and suggestions about methods to appear innocent on the test. The remaining 24 subjects (in the information plus practice group) received the same information and were given two practice polygraph examinations and feedback regarding performance. Following the treatment session, each subject was given a CQ polygraph examination by an examiner who did not know the subject's guilt, innocence, or treatment group. Test scoring was based upon measures of skin conductance, changes in blood pressure, respiration, and digital vasomotor activity. Evaluation for the control group and the information only group was identical: 88 percent correct, 4 percent wrong, and 8 percent inconclusive. For the information plus practice group, 62.5 percent of the evaluations were correct, 25 percent were wrong, and 12.5 percent were inconclusive. The study results indicate a high degree of effectiveness of the CQ technique with naive subjects and with subjects who are provided with information only. The effectiveness of the CQ technique is weakened by the combination of information, practice, and feedback. The paper includes three references.
Index Term(s): Biological influences; Investigative techniques; Polygraph techniques; Psychological stress evaluator; Research; Testing and measurement
Note: Presented at the Society for Psychophysiological Research, Madison, Wisconsin, September 17, 1978.
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