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A quantitative review of the guilty knowledge test.

V V MacLaren1

  • 1Department of Psychology, University of New Brunswick, Saint John, Canada. vancem@nbnet.nb.ca

The Journal of Applied Psychology
|August 25, 2001
PubMed
Summary

The guilty knowledge polygraph test (GKT) accurately identifies concealed information in mock crimes. This psychophysiological method shows promise for forensic applications, with high detection rates and low false positives.

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Area of Science:

  • Forensic Psychology
  • Psychophysiology
  • Criminal Justice Research

Background:

  • The Guilty Knowledge Test (GKT) is a polygraph technique designed to detect concealed information in criminal suspects.
  • Previous research on GKT accuracy has yielded varied results, necessitating a comprehensive synthesis of findings.
  • Understanding GKT's efficacy is crucial for its potential application in real-world investigations.

Purpose of the Study:

  • To provide a comprehensive estimate of the Guilty Knowledge Test's accuracy using a meta-analytic approach.
  • To evaluate GKT performance under controlled laboratory conditions across multiple simulation studies.
  • To assess the impact of mock crime enactments on GKT detection rates.

Main Methods:

  • Conducted a meta-analysis of 50 treatment groups from 22 laboratory simulation studies, involving 1,247 participants.
  • Focused on electrodermal measures as the primary psychophysiological indicator of concealed knowledge.
  • Analyzed data to calculate overall accuracy, effect sizes, and false-positive error rates.

Main Results:

  • Electrodermal measures correctly identified 76% of participants with concealed knowledge and 83% of those without.
  • Informed participants were detected at rates significantly above chance (mean weighted effect size = .57).
  • Mock crime enactment improved the detection rate to 82%; false-positive rates did not significantly exceed chance.

Conclusions:

  • The Guilty Knowledge Test demonstrates significant accuracy in detecting concealed information under controlled settings.
  • GKT shows potential as a reliable psychophysiological tool in forensic investigations.
  • Further research and application in real-world scenarios are warranted.

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