안구운동 추적장비를 통한 거짓말자의 동공크기 및 안구운동 연구
The study of pupil size and eye movement during deception using eye tracker
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초록
본 연구는 동공크기와 안구운동을 통해 거짓말자와 진실자의 특성과 차이를 확인하였다. 실험참가자의 자발적인 선택에 따라 유죄(25명)와 무죄(27명) 집단으로 나눠 모의범죄를 수행한 후, 비교질문검사를 실시하여 동공크기 및 응시횟수와 응시시간을 측정하였다. 비교질문검사는 9개의 문장(범죄관련 질문 2개, 비교질문 3개, 무관련 질문 4개)으로서 안구운동 추적장비의 모니터를 통해 글자로 제시되었다. 실험결과, 유죄집단은 범죄관련 질문에서 무죄집단에 비해 동공크기가 유의미하게 확장되었으며, 범죄관련 자극에 대한 응시횟수와 응시시간은 집단 간 차이가 없었다. 본 연구를 통해 거짓말 시 동공확장을 확인하였는데, 이는 향후 동공크기를 통한 거짓말의 탐지 가능성을 시사한다.
Abstract
The present study aimed to examine a change in pupil size and the eye movement during deception. Participants were recruited for either guilty (25 people) or innocent (27 people) group and performed a mock crime. After the mock crime, participants' pupil size and eye movements (fixation count and dwell time) were measured during the comparison question test. During the comparison question test, nine sentences (two crime-related questions, three comparison questions, four irrelevant questions) were presented on the monitor connected with eye tracker. The findings indicated that the guilty group showed significantly larger pupil size when the crime-relevant questions were given than did the innocent group while two groups showed no difference in fixation count and dwell time. The findings revealed that pupil dilation was different between liars and truth tellers, and thus, pupil dilation can be a useful measurement to detect deception and may contribute to an increase of the accuracy of lie detection.
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