한국심리학회지:법 (Korean Journal of Forensic Psychology)

한국법심리학회 (Korean Association of Psychology and Law)
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P300 숨긴정보검사에서 BAD 방법과 BCD 방법의 비교

The comparison of the BAD and the BCD methods in a P300-based concealed information test

  • Eom, Jin-Sup (Department of Psychology, Chungbuk National University)
  • 투고 : 2021.07.17
  • 발행 : 2021.07.31
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초록

P300 숨긴정보검사에서 거짓말 여부를 판단하기 위하여 가장 많이 사용되는 기법은 부트스트랩 진폭차이(BAD) 방법과 부트스트랩 상관차이(BCD) 방법이다. 두 방법의 정확판단율을 비교한 선행연구들은 일관되지 않은 결과를 보고하였다. 일부의 연구들에서 BAD 방법이 BCD 방법보다 더 정확하다고 보고되고 있지만, 다른 연구에서는 BCD 방법이 BAD 방법보다 더 정확한 것으로 나타났다. 본 연구의 목적은 BAD 방법의 정확도가 더 높은 조건과 BCD 방법의 정확도가 더 높은 조건을 확인하는 것이다. 몬테 카를로 연구결과, 전반적으로 BAD 방법의 오경보율이 BCD 방법의 오경보율보다 더 높았으며, BAD 방법의 적중률이 BCD 방법의 적중률보다 더 높았다. 관련자극과 무관련자극의 P300 잠재시간이 비슷한 경우에 비교하여 관련자극의 P300 잠재시간이 약 100ms 빠른 경우에는 BCD 방법의 적중률이 크게 감소하였으며, 약 100ms 느린 경우에는 BCD 방법의 적중률이 증가하였다. 관련자극의 P300 진폭이 무관련자극의 P300 진폭보다 약간 더 크면서 관련자극의 P300 잠재시간이 목표자극의 P300 잠재시간보다 긴 경우에는 BCD 방법의 적중률이 BAD 방법의 적중률보다 더 높았다. BAD 방법의 오경보율이 높은 이유와 BCD 방법의 적중률이 관련자극의 P300 잠재시간에 영향을 받는 이유에 대해서 논의하였다.

In the P300-based concealed information test, most commonly used methods to detect whether a subject is lying are the bootstrapped amplitude difference (BAD) and the bootstrap correlation difference (BCD). Previous studies comparing the accuracy of the two methods reported inconsistent results. Most studies showed that the BAD is more accurate than the BCD, but some studies found that the BCD had a higher accuracy rate than the BAD. The purpose of the study is to identify conditions where the each method has higher accuracy compared to the other. In the result of Monte Carlo study, the false alarm rate of the BAD was generally higher than that of the BCD, and the hit rate of the BAD was higher than that of the BCD. Compared to the condition where the P300 latencies of probe and irrelevant were similar, the hit rate of the BCD was decreased when the P300 latency of probe was about 100 ms faster, and the hit rate of the BCD was increased when the P300 latency of probe was about 100 ms slower. When the P300 amplitude of the probe was slightly larger than that of the irrelevant and the P300 latency of probe was longer than that of target, the hit rate of the BCD was higher than that of the BAD. The reason why the false alarm rate of the BAD is higher than that of BCD and why the hit rate of the BCD is affected by the P300 latency of the probe were discussed.

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과제정보

이 논문은 2019년 대한민국 교육부와 한국연구재단의 지원을 받아 수행된 연구임(NRF-2019S1A5B5A07093030).

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