P300 숨긴정보검사에서 순열 검증의 정확도 = The Accuracy of Permutation Test in P300-based Concealed Information Test

다국어 초록 (Multilingual Abstract)

The purpose of this study is to show the P300 amplitude of probe stimulus is overestimated more than that of irrelevant stimulus because of the difference of the number of trials between two stimuli in the P300-based concealed information test, and to demonstrate that the type 1 error rate of bootstrap method is higher than the significance level, but that of permutation test is the same as the significance level. The type 1 error rate and the statistical power of bootstrap method and permutation test were estimated by using Monte Carlo study in the case of using 30 Hz, 10 Hz, or 5 Hz low-pass filter, and using P300 peak amplitude or P300 mean amplitude of 100 ms interval. As a result, despite using low-pass filter or P300 mean amplitude of 100 ms interval, the extent of overestimation for the P300 amplitude of probe stimulus was greater at least about 1 ㎶ than that of irrelevant stimulus. For this reason the type 1 error rate of bootstrap method was higher than the significance level. However, the type 1 error rate of permutation test was the same as the significance level. The power of permutation test was highest when 5 Hz low-pass filter and P300 means amplitude of 100 ms interval were used. The results of this study can be used in all cases where the P300 amplitudes of two stimuli with different number of trials are compared.

국문 초록 (Abstract)

본 연구의 목적은 P300 숨긴정보검사에서 저역통과필터나 100 ms 구간의 P300 평균전위를 사용하더라도 관련자극과 무관련자극의 시행수 차이로 인하여 관련자극의 P300 진폭이 과대추정된다는 것을 밝히고, 부트스트랩 방법의 1 종 오류율은 유의수준보다 크게 나타나지만 순열 검증의 1 종 오류율은 적절하게 통제된다는 것을 증명하는 것이다. 몬테 카를로 연구를 이용하여 30 Hz, 10 Hz, 또는 5 Hz 저역통과필터를 사용하는 경우와 P300 정점 또는 100 ms 구간의 P300 평균전위를 사용하는 경우에 부트스트랩 방법과 순열 검증의 1 종 오류율과 통계적 검증력을 산출하였다. 연구 결과, 저역통과필터를 사용하거나 100 ms 구간의 P300 평균전위를 사용하여도 관련자극의 P300 진폭이 과대추정되는 정도가 무관련자극의 P300 진폭이 과대추정되는 정도보다 약 1 ㎶ 이상 더 컸다. 이로 인하여 부트스트랩 방법의 1 종 오류율은 유의수준보다 더 높게 나타났다. 그러나 순열 검증의 1 종 오류율은 유의수준과 동일하였다. 순열 검증의 검증력은 5 Hz의 저역통과필터를 사용하고 100 ms 구간의 P300 평균전위를 사용하는 경우에 가장 높았다. 본 연구결과는 P300 숨긴정보검사 뿐만 아니라 시행수가 서로 다른 자극의 P300 진폭을 비교하는 모든 경우에도 활용될 수 있을 것이다.

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