Science of Emotion and Sensibility (감성과학)

Korean Society for Emotion and Sensibility (한국감성과학회)
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Lie Detection Using the Difference Between Episodic and Semantic Memory

일화기억과 의미기억 간의 차이를 이용한 거짓말 탐지

  • Eom, Jin-Sup (Department of Psychology, Chungbuk National University) ;
  • Jeon, Hajung (Department of Psychology, Chungnam National University) ;
  • Sohn, Jin-Hun (Department of Psychology, Chungnam National University)
  • Received : 2018.08.29
  • Accepted : 2018.09.18
  • Published : 2018.09.30
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Abstract

Items related to a crime that are known only to criminals and investigators can be used in the concealed information test (CIT) to assess whether the suspect is guilty of the offense. However, in many cases wherein the suspect is exposed to information about the crime, the CIT cannot be used. Although the perpetrator's memories about the details of the crime are episodic, the memories of a suspect who has inadvertently discovered the details of the crime are more likely to be semantic. The retrieval of episodic memories is associated with theta wave activity, whereas that of semantic memories is associated with alpha wave activity. Therefore, these aspects of memory retrieval can be useful in identifying the perpetrator of the crime. In this study, P300-based CITs were conducted in a guilty participant in a mock crime and an innocent participant who has been given information about the simulated offense. The results demonstrate that the difference in P300 amplitudes between the probe and the irrelevant stimulus did not differ between the guilty and innocent conditions. As expected, the lower theta band power (4-6 Hz) was higher in the probe than in the irrelevant stimulus in the guilty condition, but there was no difference in the innocent condition. Conversely, the upper alpha band power (8-10 Hz) was lower in the probe than in the irrelevant stimulus in the innocent condition, but there was no difference in the guilty condition. The possibility of using theta and alpha band powers in lie detection is discussed.

범죄현장에 오직 범인과 수사관만 알 수 있는 범죄와 관련된 사항들이 있는 경우에 숨긴정보검사를 이용하여 용의자가 범인인지 또는 범인이 아닌지 평가할 수 있다. 그러나 범죄와 관련된 사항이 용의자에게 노출되어 숨긴정보검사를 사용하지 못하는 경우가 많이 발생한다. 범죄관련 사항들에 대한 범인의 기억은 일화기억에 해당하는 반면, 범죄관련 사항들을 우연히 알게 된 용의자의 기억은 일화기억보다는 의미기억에 가까울 수 있다. 일화기억의 인출은 세타파와 관련이 있고 의미기억은 알파파와 관련이 있으므로, 이를 이용하여 범인을 가려낼 수 있을 것이다. 본 연구에서는 모의 범죄를 수행한 유죄조건의 실험참가자와 모의 범죄의 내용을 들어서 알게 된 무죄조건의 실험참가자에게 P300-기반 숨긴정보검사를 실시하였다. 실험결과 관련자극과 무관련자극 간의 P300 진폭 차이는 유죄조건과 무죄조건 간에 다르지 않았다. 예상한 바와 같이 유죄조건에서 낮은 대역의 세타 파워는 무관련자극보다 관련자극에서 더 크게 나타났으며, 무죄조건에서 세타 파워는 자극 간에 차이가 없었다. 그리고 무죄조건에서 높은 대역의 알파 파워는 무관련자극보다 관련자극에서 더 작게 나타났으며, 유죄조건에서 알파 파워는 자극 간에 차이가 없었다. 알파 파워와 세타 파워를 이용한 거짓말 탐지의 가능성에 대하여 논의하였다.

Keywords

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