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ISSN : 1229-0653

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Vol.27 No.3
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P300 숨긴정보검사와 자극간 제시간격: 500ms와 800ms, 3000ms의 비교

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

한국심리학회지: 사회 및 성격 / 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
이병하 (충북대학교 심리학과)
황순택 (충북대학교)
박광배 (충북대학교)
손진훈 (충남대학교)
엄진섭 (충북대학교)
이병하, 황순택, 박광배, 손진훈, & 엄진섭. (2013). P300 숨긴정보검사와 자극간 제시간격: 500ms와 800ms, 3000ms의 비교. 한국심리학회지: 사회 및 성격, 27(3), 87-107, https://doi.org/10.21193/kjspp.2013.27.3.006
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초록

거짓말 탐지 방법의 한 종류인 P300 숨긴정보검사는 두 가지 단점을 가진다. 한 가지는 전체 검사를 실시하는데 걸리는 시간이 길다는 점이고 다른 한 가지는 대응수단에 취약할 수 있다는 점이다. 본 연구에서는, P300 숨긴정보검사에서 1초 이내의 짧은 자극간 제시간격을 사용하는 것이 두 가지 단점을 극복할 수 있는지를 검증하였다. 실험 1에서는 P300 숨긴정보검사에서 1초 이내의 짧은 자극간 제시간격을 사용하였을 때 검사의 정확도가 유지되는지 확인하였다. 실험결과, 자극간 제시간격이 500ms인 조건에서는 3000ms인 조건보다 관련자극과 무관련자극간의 P300 진폭 차이가 크게 감소한 것으로 나타났다. 자극간 제시간격이 800ms인 조건에서도 3000ms인 조건보다 관련자극과 무관련자극 간의 P300 진폭 차이가 감소하기는 하였지만, 효과크기 지수는 두 조건 간에 비슷한 것으로 나타났다. 실험 2에서는 자극간 제시간격이 3000ms인 조건과 500ms, 800ms인 조건에서 대응수단의 효과를 검증하였다. 자극간 제시간격이 3000ms인 조건과 800ms인 조건에서는 대응수단의 효과가 나타나지 않았다. 그러나 자극간 제시간격이 500ms인 조건에서는 유의수준 .10에서 검사의 정확도가 낮아지는 것으로 나타났다. 결과적으로, 자극간 제시간격이 800ms인 조건은 전체 검사시간이 짧으면서 대응수단에 영향을 받지 않을 가능성이 높았으며, 자극간 제시간격이 500ms인 조건은 검사의 정확도가 낮아질 가능성이 높은 것으로 나타났다.

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

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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