Effectiveness of Detection of Deception Examinations Using the Computer Voice Stress Analyzer.
Final rept. Feb 95-Nov 96,
DEPARTMENT OF DEFENSE POLYGRAPH INST FORT MCCLELLAN AL
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The accuracy of the Computer Voice Stress Analyzer CVSA instrument and associated processes for the detection of deception was assessed using a mock theft scenario. One hundred nine subjects were randomly assigned to two groups and given detection of deception examinations using a CVSA instrument. Subjects in one group were programmed deceptive and participated in taking 100 from a metal box located in a scenario room. The non-deceptive group did not participate in the scenarios nor did they have knowledge of the mock theft. Four trained and certified CVSA examiners conducted the examinations using a CVSA technique called the Modified Zone of Comparison test. Test chart evaluators, who had not taken part in the study and who were blind to subject programming, obtained an overall accuracy of 49.8 z .05, p .96. Administering examiners correctly identified 53 of 109 48.6 subjects as either deceptive or non-deceptive z - .21, p .84. More deceptive subjects were correctly identified by examiners than non-deceptive subjects 32 of 55 vs. 21 of 54. However, decisions were not significantly different from chance in either case.