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RESEARCH PRODUCT
Psychophysiological and vocal measures in the detection of guilty knowledge.
Matthias GamerGerhard VosselHans-georg RillHeinz Werner Gödertsubject
AdultMaleSignal Detection PsychologicalPsychometricsLie DetectionBlood PressureLogistic regressionDevelopmental psychologyPolygraphLie detectionHeart RateMemoryPredictive Value of TestsReference ValuesPhysiology (medical)Stress (linguistics)HumansFalse Positive ReactionsCriminal PsychologyGeneral NeuroscienceRespirationContrast (statistics)Reproducibility of ResultsGalvanic Skin ResponseMiddle AgedCriminal psychologyTest (assessment)Neuropsychology and Physiological PsychologyPsychophysiologyKnowledgeLogistic ModelsGuiltCrimePsychologyClinical psychologyPsychophysiologydescription
The Guilty Knowledge Test (GKT) and its variant, the Guilty Actions Test (GAT), are both psychophysiological questioning techniques aiming to detect guilty knowledge of suspects or witnesses in criminal and forensic cases. Using a GAT, this study examined the validity of various physiological and vocal measures for the identification of guilty and innocent participants in a mock crime paradigm. Electrodermal, respiratory, and cardiovascular measures successfully differentiated between the two groups. A logistic regression model based on these variables achieved hit rates of above 90%. In contrast to these results, the vocal measures provided by the computerized voice stress analysis system TrusterPro were shown to be invalid for the detection of guilty knowledge.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-12-28 | International journal of psychophysiology : official journal of the International Organization of Psychophysiology |