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Korean Journal of Social and Personality Psychology

ISSN : 1229-0653

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Vol.27 No.3

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P300-based Concealed Information Test and Inter-Stimulus Intervals (ISIs): A Comparison Among 500ms, 800ms, and 3000ms ISIs

Korean Journal of Social and Personality Psychology / Korean Journal of Social and Personality Psychology, (P)1229-0653;
2013, v.27 no.3, pp.87-107
https://doi.org/10.21193/kjspp.2013.27.3.006





& (2013). P300-based Concealed Information Test and Inter-Stimulus Intervals (ISIs): A Comparison Among 500ms, 800ms, and 3000ms ISIs. Korean Journal of Social and Personality Psychology, 27(3), 87-107, https://doi.org/10.21193/kjspp.2013.27.3.006

Abstract

Major shortcomings in P300-based CIT are the length of time to complete the test and vulnerability to countermeasures. The present study examined whether inter-stimulus interval (ISI) less than 1 second could make up for the two shortcomings of P300-based CIT. Study 1 examined detection accuracy of P300-based CIT with ISI less than 1 second. Compared to 3000ms ISI, 500ms ISI significantly decreased the difference of P300 amplitude between the probe and the irrelevant stimuli. Although the difference of P300-based amplitude between the probe and the irrelevant stimuli with 800ms ISI also decreased from that with 3000ms ISI, interestingly, the decrease was not significant. Study 2 examined effect of countermeasure in 500ms, 800ms and 3000ms ISI. The effect of countermeasure with 800ms and 3000ms ISI was not significant, while it was significant with 500ms ISI at alpha level of .1. With 500ms ISI, detection accuracy of P300-based CIT diminished. The results of study 1 and 2 suggest that 800ms ISI would supplement the two shortcomings of P300-based CIT without a significant loss of accuracy.

keywords
P300, 숨긴정보검사, 유죄지식검사, 자극간 제시간격, P300, concealed information test, guilty knowledge test, inter-stimulus interval

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