Accession Number : ADA300334

Title :   A Comparison Between Decision Accuracy Rates Obtained Using the Polygraph Instrument and the Computer Voice Stress Analyzer (CVSA) in the Absence of Jeopardy.

Descriptive Note : Final rept. May 94-Aug 95,

Corporate Author : DEPARTMENT OF DEFENSE POLYGRAPH INST FORT MCCLELLAN AL

Personal Author(s) : Cestaro, Victor L.

PDF Url : ADA300334

Report Date : AUG 1995

Pagination or Media Count : 39

Abstract : This two-experiment study was designed to (1) validate the underlying electronic theory of operation of the Computer Voice Stress Analyzer (CVSA), and (2) examine the decision accuracy and agreement rates using the traditional polygraph instrument and the CVSA. The CVSA input/output was evaluated using simulation signals from lab test generators. Forty-two subjects took psychophysiological detection of deception (PDD) examinations with the polygraph and CVSA instruments, within the context of Peak of Tension (POT) tests using numbers between 3 and 8. Half of the subjects were tested with the polygraph instrument, then the CVSA instrument. The remaining half were tested using the instruments in the opposite order. PDD and CVSA based POT tests were blind-evaluated by four examiners for each instrument. The frequencies of accurate determinations made using each instrument were compared using proportionality tests. The lab simulations established that the CVSA performs electrically according to the manufacturer's theory of operation. The CVSA and associated processes were less accurate than the polygraph and PDD processes tested in similar circumstances (38.7% vs. 62.5%). Interrater reliability, assessed using a multiple rater Kappa test, showed agreement among all blind evaluators within each instrument category was significantly better than chance (p < .05). These data indicate there may be a systematic and predictable relationship between voice patterns and stress related to deception.

Descriptors :   *VOICE COMMUNICATIONS, *PSYCHOPHYSIOLOGY, *LIE DETECTORS, TEST AND EVALUATION, STRESSES, SIMULATION, ELECTRONICS, DETECTION, MANUFACTURING, DECISION MAKING, PREDICTIONS, COMPUTERS, STRESS(PSYCHOLOGY), STRESS(PHYSIOLOGY), THEORY, RATES, ACCURACY, INPUT OUTPUT PROCESSING, SIGNALS, OPERATION, PATTERNS, LABORATORIES, AGREEMENTS, GENERATORS, ANALYZERS, DECEPTION.

Subject Categories : Psychology
      Computer Programming and Software
      Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE