Detection of Concealed Information: Combining a Virtual Mock Crime with a P300-based Guilty Knowledge Test

2009 ◽  
Vol 12 (3) ◽  
pp. 269-275 ◽  
Author(s):  
Jinsun Hahm ◽  
Hyung Ki Ji ◽  
Je Young Jeong ◽  
Dong Hoon Oh ◽  
Seok Hyeon Kim ◽  
...  
Keyword(s):  
Knowledge Test ◽  
Guilty Knowledge Test ◽  
Mock Crime ◽  
Information Combining ◽  
Concealed Information ◽  
Detection Of Concealed Information

scholarly journals The Guilty Knowledge Test and the Modified Stroop Task in Detection of Deception: An Exploratory Study

2003 ◽  
Vol 92 (2) ◽  
pp. 683-691 ◽  
Author(s):  
Iris M. Engelhard ◽  
Harald Merckelbach ◽  
Marcel A. van den Hout
Keyword(s):  
Stroop Task ◽  
Reaction Times ◽  
Lie Detection ◽  
Color Naming ◽  
Multiple Choice Questions ◽  
Knowledge Test ◽  
Guilty Knowledge Test ◽  
Modified Stroop ◽  
Stroop Paradigm ◽  
Mock Crime

The current study tested whether a simple Stroop paradigm can be used to detect deceptive behavior. 40 university students (34 women), half of whom committed a mock crime, were administered a Guilty Knowledge Test and modified Stroop task to detect guilt or innocence. The Guilty Knowledge Test is a well-known psychophysiological detection method, which consists of multiple-choice questions about details of the crime while skin conductance is recorded. Subjects possessing guilty knowledge are expected to show enhanced differential responses to the relevant stimuli. The modified Stroop task required color-naming of colored words related to the mock crime or an irrelevant crime. Each version of the Stroop task was presented in story form. Subjects possessing guilty knowledge were expected to produce larger reaction times to the relevant version relative to the irrelevant version. The test correctly identified 100% of innocent participants and 78% of guilty participants. In contrast, Stroop interference, i.e., reaction times for irrelevant crime details subtracted from those for mock crime details, did not differentiate between the two groups, suggesting that the story form of the Stroop paradigm is not suitable for lie detection.

Estimating the Validity of the Guilty Knowledge Test From Simulated Experiments: The External Validity of Mock Crime Studies.

2003 ◽  
Vol 9 (4) ◽  
pp. 261-269 ◽  
Author(s):  
David Carmel ◽  
Eran Dayan ◽  
Ayelet Naveh ◽  
Ori Raveh ◽  
Gershon Ben-Shakhar
Keyword(s):  
External Validity ◽  
Knowledge Test ◽  
Guilty Knowledge Test ◽  
Mock Crime

Appropriate Presentation of Skin Conductance Accuracy with the Guilty Knowledge Test

2003 ◽  
Vol 93 (3_suppl) ◽  
pp. 1047-1048
Author(s):  
Eitan Elaad
Keyword(s):  
Skin Conductance ◽  
Effect Size ◽  
Knowledge Test ◽  
Guilty Knowledge Test ◽  
Accuracy Rates

It was suggested that, when the Guilty Knowledge Test uses two repetitions, these should be combined showing the contribution of the second repetition to the accuracy of the first. Also recommended were effect size statistics in addition to accuracy rates.

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