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ISSN : 1229-067X

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Vol.27 No.3
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P300 숨긴정보검사의 민감도: 목표자극을 이용하는 측정 패러다임과 두 자극에 대한 범주판단 및 재인검사를 이용하는 측정 패러다임의 비교

Sensitivity of P300-based concealed information test: A comparison between testing paradigms with and without a target stimulus

한국심리학회지: 일반 / Korean Journal of Psychology: General, (P)1229-067X; (E)2734-1127
2008, v.27 no.3, pp.653-673
엄진섭 (충북대학교)
한유화 (충북대학교)
박광배 (충북대학교)
손진훈 (충남대학교)
엄진섭, 한유화, 박광배, & 손진훈. (2008). P300 숨긴정보검사의 민감도: 목표자극을 이용하는 측정 패러다임과 두 자극에 대한 범주판단 및 재인검사를 이용하는 측정 패러다임의 비교. 한국심리학회지: 일반, 27(3), 653-673.
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초록

본 연구에서는 피험자에게 친숙하면서 중요한 의미를 가지고 있는 부모의 이름을 숨긴정보로 사용하여 세 자극 패러다임(목표자극과 관련자극, 무관련자극)을 이용한 P300 숨긴정보검사의 민감도를 추정하였으며, 이와 더불어 목표자극을 제거한 새로운 두 자극 패러다임의 민감도를 추정하여 비교하였다. 목표자극을 제거한 두 자극 패러다임은 피험자가 검사자극에 주의를 집중하도록 하는 새로운 절차를 포함하고 있어야 하므로, 본 연구에서 두 가지 절차를 고안하였다. 한 가지는 ‘두 자극 패러다임-범주판단’으로 제시된 자극의 범주를 판단하게 하는 방법이었으며, 다른 한 가지는 ‘두 자극 패러다임-재인검사’로 제시된 자극에 대해 재인검사를 실시하는 방법이었다. 32명의 피험자에게 세 가지 종류의 측정패러다임으로 피검자내 설계를 이용하여 실험한 결과, 관련자극에 대한 P300과 무관련자극에 대한 P300의 크기차이는 세 자극 패러다임이 두 자극 패러다임-범주판단과 두 자극 패러다임-재인검사보다 유의하게 큰 것으로 나타났으며, 부트스트랩 절차를 이용한 개인별 진단에서도 목표자극을 포함하고 있는 세 자극 패러다임의 민감도가 .875로 가장 높았으며, 두 자극 패러다임-범주판단과 두 자극 패러다임-재인검사의 민감도는 모두 .594로 낮았다. 반응시간의 측면에서는 기존의 연구결과와 달리, 세 가지 종류의 측정 패러다임 모두에서 관련자극에 대한 반응시간과 무관련자극에 대한 반응시간 간에 유의한 차이가 나타나지 않았다.

keywords
event-related potential, P300, concealed information test, guilty knowledge test, lie detection, 사건관련전위, P300, 유죄지식검사, 숨긴정보검사, 거짓말탐지

Abstract

In this study, the sensitivity of P300-based concealed information test using the paradigm of three stimuli(targets, probes, and irrelevants), P3S, was estimated with parental names as concealed information and it was compared with the sensitivity of two stimuli(probes and irrelevants) paradigm. Two new procedures were devised to force the subjects to concentrate on the stimuli in the two stimuli paradigm. In the ‘paradigm of two stimuli with category judgement (P2S-CJ)’, the subjects made a judgement on the category to which the presented stimulus belonged. In the ‘paradigm of two stimuli with recognition test (P2S-RT)’, on the other hand, the subjects were given a recognition test after the presentation of a stimulus. The highest P300 difference between probes and irrelevants was found when the P3S was used, compared to the differences in P300 when the P2S-CJ or the P2S-RT was used. The sensitivity of the P3S for individual diagnosis was also highest (.875) compared to the sensitivity of the P2S-CJ or the P2S-RT. In contrast to the results from previous studies, the differences in response time between probes and irrelevants were not statistically significant in all three types of paradigm. Failure to find the differences in response time was explained by the nature of the stimuli used in the present study.

keywords
event-related potential, P300, concealed information test, guilty knowledge test, lie detection, 사건관련전위, P300, 유죄지식검사, 숨긴정보검사, 거짓말탐지

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