Integrated Zone Comparison Polygraph Technique Accuracy with Scoring Algorithm

by Nathan J. Gordon a, Feroze B. Mohamed, Scott H. Faro, Steven M. Platek, Harris Ahmad and J. Michael Williams


The Integrated Zone Comparison Technique (IZCT) was utilized with computerized polygraph instrumentation as part of a blind study in the detection of deception. Three scoring algorithms: ASIT Poly Suite (Academy for Scientific Investigative Training’s Horizontal Scoring and Algorithm for Chart Interpretation), PolyScore\ 5.5, and the Objective Scoring System (OSS) were assessed in the interpretation of the charts generated. Where ‘‘Inconclusives’’ were excluded, accuracy for the IZCT with all three algorithms was 100%. When ‘‘Inconclusives’’ were counted as errors, overall accuracy for the IZCT with ASIT Poly Suite was 90% and accuracy with PolyScore and the Objective Scoring System was 72%.

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The full study was published in Physiology & Behavior, Volume 87, Number 4.
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