Psychophysiological and vocal measures in the detection of guilty knowledge.
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.
Gamer
Matthias
M
Department of Psychology, Interdisciplinary Research Group Forensic Psychophysiology, Johannes Gutenberg-University Mainz, Staudingerweg 9, D-55099 Mainz, Germany. gamer@uni-mainz.de
Rill
Hans-Georg
HG
Vossel
Gerhard
G
Gödert
Heinz Werner
HW
D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D003415:Crime; D003417:Criminal Psychology; D005189:False Positive Reactions; D005712:Galvanic Skin Response / Q000502:physiology; D006167:Guilt; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D019359:Knowledge; D008014:Lie Detection; D016015:Logistic Models; D008297:Male; D008568:Memory / Q000502:physiology; D008875:Middle Aged; D011237:Predictive Value of Tests; D011594:Psychometrics / Q000379:methods; D011603:Psychophysiology; D012016:Reference Values; D015203:Reproducibility of Results; D012119:Respiration; D017603:Signal Detection, Psychological / Q000502:physiology