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ISSN : 1226-9654

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Vol.25 No.1

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A Comparison of Detection Accuracy of P300-based Guilty Knowledge Test: Based on Bootstrap Approach

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2013, v.25 no.1, pp.75-92
https://doi.org/10.22172/cogbio.2013.25.1.005


& (2013). A Comparison of Detection Accuracy of P300-based Guilty Knowledge Test: Based on Bootstrap Approach. The Korean Journal of Cognitive and Biological Psychology, 25(1), 75-92, https://doi.org/10.22172/cogbio.2013.25.1.005

Abstract

We compared detection accuracies of P300-based guilty knowledge test based on 2 bootstrap approaches: bootstrapped correlation difference (BCD) and bootstrapped amplitude difference (BAD). Event-related potential data of the guilty group (n=12) and the innocent group (n=12) in Kang and Kim(2010)'s study were subjected to bootstrap analysis. P300 amplitude from all single sweeps of each of target, probe, and irrelevant stimulus at the parietal midline (Pz) or the frontal midline (Fz) electrode site was collected for each participant. Target stimulus is relevant to the experimental task, but not related to the crime. Participants were asked to discriminate the target stimulus from other stimuli. Probe stimulus includes the critical information of the crime, the guilty knowledge, thus guilty participants are supposed to pay attention to it compared to irrelevant stimulus. Irrelevant stimulus is not relevant to the crime and the task. Two different bootstrap analysis were applied to determine individual's guilt or innocence. BCD method estimated double-centered correlation coefficients between the average of target and probe sweeps, and between the average of probe and irrelevant sweeps for a participant. If the former are greater than the latter in 600 trials out of 1,000 bootstrap iterations, the participant is regarded as guilty. BAD method estimated amplitude difference between probe and irrelevant sweeps, and if the difference is positive, the participant is found to be guilty. As a result, BCD method outperformed BAD method. The detection accuracies, without indeterminacy, of BCD and BAD were up to 80.0%, 56.5%, respectively. It seems that BCD method is more appropriate to determine individual's guilt or innocence, and to get high detection accuracy of the guilty knowledge test using event-related potentials.

keywords
guilty knowledge test, event-related potential, P300, detection accuracy, bootstrap, 유죄지식검사, 사건관련전위, P300, 탐지정확률, 부트스트랩

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