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ISSN : 1229-0653

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Vol.28 No.3

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P300 숨긴정보검사에서 시행수가 검사결과에 미치는 영향

Effects of the Number of Trials on Test Results in P300-based Concealed Information Test

한국심리학회지: 사회 및 성격 / Korean Journal of Social and Personality Psychology, (P)1229-0653;
2014, v.28 no.3, pp.61-79
https://doi.org/10.21193/kjspp.2014.28.3.004
엄진섭 (충북대학교)
박광배 (충북대학교)
엄진섭, & 박광배. (2014). P300 숨긴정보검사에서 시행수가 검사결과에 미치는 영향. 한국심리학회지: 사회 및 성격, 28(3), 61-79, https://doi.org/10.21193/kjspp.2014.28.3.004

초록

시행수는 P300 숨긴정보검사(P300 CIT)에 두 가지 방식으로 영향을 미칠 수 있다. 한 가지는 시행수가 많아질수록 자극에 습관화되어 P300 진폭이 감소할 가능성이 있다는 점이다. P300 진폭이 감소하면 P300 CIT의 정확판단율은 감소할 것이다. 다른 한 가지는 시행수가 많아질수록 통계적 검증력이 증가한다는 점이다. 통계적 검증력이 증가하면, P300 CIT의 정확판단율은 증가할 것이다. 본 연구에서는 P300 CIT에서 시행수가 증가함에 따라서 P300 진폭이 감소하는지, 또는 시행수가 증가함에 따라서 P300 CIT의 정확판단율이 증가하는지 검증하였다. 24명의 실험참가자들이 모의범죄를 수행한 후에, P300 CIT를 사용한 거짓말 탐지 검사를 받았다. 실험참가자의 반은 사진 자극을 제시받았으며, 나머지 반은 문자자극을 제시받았다. 목표자극 1개와 관련자극 1개, 무관련자극 4개를 각각 30번씩 제시하는 것을 한 블록으로 하여, 총 네 블록에 걸쳐서 검사를 받았다. 실험결과, 예상과는 달리 목표자극에 대한 P300 진폭은 첫 번째 블록에서 가장 작은 값을 보였고, 네 번째 블록에서 가장 큰 값을 보였다. 관련자극에 대한 P300 진폭과 무관련자극에 대한 P300 진폭은 검사 후반부로 갈수록 약간 감소하는 경향이 있었다. 부트스트랩 크기차이분석 결과에서, 분석에 사용된 블록 수가 증가하여도 정확판단율에 큰 차이가 없는 것으로 나타났다. 부트스트랩 상관차이분석 결과에서, 첫 번째 블록만 사용한 경우의 정확판단율이 여러 개의 블록을 누적시켜 사용한 경우의 정확판단율보다 낮은 경향이 있었다. 사진자극과 문자자극 간에는 정확판단율에 큰 차이가 없었다. 시행수가 증가함에 따라서 목표자극의 P300 진폭이 증가한 이유와 부트스트랩 상관차이분석 결과가 시행 수에 영향을 받았던 이유를 논의하였다.

keywords
P300, 숨긴정보검사, 습관화, 시행수, P300, concealed information test, habituation, the number of trials

Abstract

The number of trials can influence P300-based concealed information test (P300-based CIT) in two ways. First, as the number of trial increases, the P300 amplitude is likely to reduce due to habituation. If P300 amplitude decreases, accuracy rate of P300 CIT would be declined. Second, as the number of trial increases, the power of test increases and then the accuracy rate would also be increased. This study is to verify whether the accuracy rate of P300 CIT declines or improves as the number of trials increases. After twenty-four participants performed a mock crime, lie detection test was administered to them by using the P300 CIT. Half of the participants was exposed to photo stimuli, and the other half was presented with letter stimuli. A target stimulus, a probe stimulus, and four irrelevant stimuli were presented 30 times in one block, and four blocks were presented to each participant. Contrary to our expectation, P300 amplitude to the target stimulus was smallest in the first block and was largest in the fourth block. P300 amplitude to the relevant stimulus and to the irrelevant stimuli tended to decrease slightly at the second half of the experiment. In bootstrapped amplitude difference tests, there was no significant difference in the accuracy rate as the number of blocks increase. In bootstrapped correlation difference tests, the accuracy rate tended to be lower when only the first block was used, compared to that when several blocks were included. There was no significant difference between the photo stimuli and the letter stimuli in both bootstrapped tests. Reasons why P300 amplitude by a target stimulus was increased and the bootstrapped correlation difference tests were impacted by the number of trials were discussed.

keywords
P300, 숨긴정보검사, 습관화, 시행수, P300, concealed information test, habituation, the number of trials

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