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Integrated zone comparison polygraph technique accuracy with scoring algorithms.

Nathan J Gordon1, Feroze B Mohamed, Scott H Faro

  • 1Academy for Scientific and Investigative Training, Philadelphia, PA 19103, USA. truthdoctor@polygraph-training.com

Physiology & Behavior
|December 14, 2005
PubMed
Summary
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The Integrated Zone Comparison Technique (IZCT) achieved 100% accuracy in deception detection when inconclusives were excluded. When inconclusives were counted as errors, accuracy varied by algorithm, with the ASIT Poly Suite reaching 90%.

Area of Science:

  • Forensic Psychology
  • Psychophysiology
  • Lie Detection Technology

Background:

  • The Integrated Zone Comparison Technique (IZCT) is a method used in polygraph examinations.
  • Computerized polygraph instrumentation is essential for objective data collection.
  • Assessing the reliability of different scoring algorithms is crucial for accurate deception detection.

Purpose of the Study:

  • To evaluate the accuracy of the IZCT using computerized polygraph instrumentation.
  • To compare the performance of three distinct scoring algorithms: ASIT Poly Suite, PolyScore 5.5, and Objective Scoring System (OSS).
  • To determine the impact of 'Inconclusive' results on overall accuracy.

Main Methods:

  • A blind study design was employed to minimize bias.

Related Experiment Videos

  • The Integrated Zone Comparison Technique (IZCT) was applied.
  • Data interpretation was performed using three scoring algorithms: ASIT Poly Suite, PolyScore 5.5, and OSS.
  • Polygraph charts generated from computerized instrumentation were analyzed.

    • Main Results:

    • When 'Inconclusive' results were excluded, the IZCT demonstrated 100% accuracy across all three scoring algorithms.
    • When 'Inconclusive' results were treated as errors, the ASIT Poly Suite achieved 90% accuracy.
    • PolyScore 5.5 and the Objective Scoring System (OSS) showed 72% accuracy when 'Inconclusive' results were counted as errors.

    Conclusions:

    • The IZCT is a highly accurate method for deception detection when 'Inconclusive' results are managed appropriately.
    • The choice of scoring algorithm significantly impacts the overall accuracy of the IZCT, particularly when 'Inconclusive' results are considered errors.
    • Further research may be warranted to refine algorithms and reduce the occurrence of 'Inconclusive' results in polygraph examinations.