Science of Emotion and Sensibility (감성과학)

Korean Society for Emotion and Sensibility (한국감성과학회)
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The Effect of Response Type on the Accuracy of P300-based Concealed Information Test

반응양식이 P300 숨긴정보검사의 정확도에 미치는 영향

  • Jeon, Hajung (Department of Psychology, Chungnam National University) ;
  • Sohn, Jin-Hun (Department of Psychology, Chungnam National University) ;
  • Park, Kwangbai (Department of Psychology, Chungbuk National University) ;
  • Eom, Jin-Sup (Department of Psychology, Chungbuk National University)
  • Received : 2017.05.04
  • Accepted : 2017.08.11
  • Published : 2017.09.30
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Abstract

This study examined the effects of button response to probe and irrelevant stimuli on P300 amplitude and lie detection rate in P300-based concealed information test. Participants underwent the P300-based concealed information test (P300 CIT) in two conditions. In one button condition participants were instructed to press the left mouse button only when the target was present. In two button condition, they were asked to press the left mouse button for target and right button for non-target. The results showed that the response time to target stimulus was not significantly different between the two conditions, and the response time to the probe stimulus was significantly longer than the irrelevant stimulus. The P300 amplitudes for the probe and irrelevant stimulus were all smaller in one button condition compared to two button condition. However, the P300 amplitude difference between the probe stimulus and the irrelevant stimulus did not show a significant difference in the two experimental conditions, and the lie detection rate did not differ significantly between the two conditions. Based on these findings, the effect of button response on P300 CIT with a short inter-stimulus interval was discussed.

본 연구에서는 P300 숨긴정보검사에서 관련자극과 무관련자극에 대한 버튼 반응 여부가 P300 진폭과 거짓말 탐지 정확률에 미치는 영향을 검증하였다. 실험참가자들은 두 가지 조건에서 P300 숨긴정보검사를 받았다. 일반응 조건에서는 실험참가자들에게 목표자극이 제시될 때에만 마우스 왼쪽 버튼을 누르도록 지시하였으며, 양반응 조건에서는 제시되는 자극이 목표자극이면 마우스 왼쪽 버튼을 누르고 목표자극이 아니면 마우스 오른쪽 버튼을 누르도록 하였다. 실험 결과, 목표자극에 대한 반응시간은 두 조건에서 유의하게 다르지 않았으며, 양반응 조건에서 관련자극에 대한 반응시간은 무관련자극에 대한 반응시간보다 유의하게 더 길었다. 관련자극에 대한 P300 진폭과 무관련자극에 대한 P300 진폭은 모두 양반응 조건에 비교하여 일반응 조건에서 더 작았다. 그러나 관련자극과 무관련자극 간의 P300 진폭 차이는 두 실험조건에서 유의한 차이가 나타나지 않았으며, 거짓말 탐지율도 두 조건 간에 큰 차이가 없었다. 이러한 결과에 근거하여 버튼 반응이 자극 간 제시간격이 짧은 P300 숨긴정보검사에 미치는 영향을 논의하였다.

Keywords

References

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