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Korean Journal of Social and Personality Psychology

ISSN : 1229-0653

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Vol.29 No.2

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Effects of Countermeasures on P300-based Concealed Information Test with Short Inter-Stimulus Interval

Korean Journal of Social and Personality Psychology / Korean Journal of Social and Personality Psychology, (P)1229-0653;
2015, v.29 no.2, pp.91-108
https://doi.org/10.21193/kjspp.2015.29.2.006




& (2015). Effects of Countermeasures on P300-based Concealed Information Test with Short Inter-Stimulus Interval. Korean Journal of Social and Personality Psychology, 29(2), 91-108, https://doi.org/10.21193/kjspp.2015.29.2.006

Abstract

This study was to test whether P300 CIT, which has one prove and 1s inter-stimulus interval affected by countermeasures. Also, it was to investigate the method for the detection of countermeasure. The effect of countermeasures was tested under the condition where the participants were asked to respond to a particular irrelevant (1CM condition) and respond to two particular irrelevants (2CM condition) out of four irrelevants. We used both physical countermeasure whether the participants were required to wiggling their fingers or toes and mental countermeasure whether the participants were required to calling his or her mother's name in mind. The results showed the use of physical and mental countermeasures influence on the detection rate in P300 CIT. When the countermeasures were not used, the detection rate was 73% in P300 CIT. The detection rate was 0 % and 14 % in 1CM condition and 2 CM condition respectively, when the physical countermeasures were used. The detection rate was 14% both in 1CM condition and 2 CM condition when the mental countermeasures were used. The detectability of the countermeasures was evaluated from correlation coefficients among ERPs. We tested whether the correlation coefficients between ERPs from irrelevant and target were greater than the correlation coefficients between ERPs from irrelevant and probe for the cases incorrectly evaluated as not lying. One hundred percent in the group of physical countermeasure and 92% in the group of mental countermeasure were included while 33% in the group of guilt were included in the criteria. The possibility for the detection of countermeasure by using correlation coefficients among ERPs was discussed.

keywords
P300, 숨긴정보검사, 거짓말탐지, 대응수단, P300, Concealed information test, Lie detection, Countermeasure

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