| Summary: | 碩士 === 玄奘大學 === 應用心理學系碩士在職專班 === 101 === A New Method of Deception Detection
Using Eye Tracking with Scene Recognition Task
Student: Shu-Huei Chang Advisor: Dr. Hung-Wei Lee
Institute of Applied Psychology
Hsuan Chuang University
ABSTRACT
Whenever there is a major criminal case in the society, the term of deception detection always brings curiosity and mystery to the population. According to the common sense, deception detection is something to do with attaching wires and sensors to the examinee and then the law-enforcement officials or other experts will make serious decisions on whether the examinee is lying or not. Although it is not totally wrong for such a common sense, it is actually different from a perfect understanding of deception detection. The so-called polygraph does not test the truthfulness of the verbal content expressed by the examinee but, instead, it catches the possible psychological and physiological responses that come with the examinee’s attempt to lie. And there is not just one type of deception detection method in current academic and practical progresses.
Modern methods of deception detection also include some professional trainings of detailed observation of micro-expressions, body language, vocal tones, and many other non-verbal cues to catch a liar. In addition, there are several new ideas using EEG, f-MRI and other brain imaging techniques to detect deception. However, we focus on how to utilize eye movement data to reveal that if the examinee indeed knows some details about the concealed information. We then propose a new paradigm of deception detection called "using eye tracking with scene recognition task" paradigm.
The rationale of the new paradigm is quite clear and straight forward: to someone who knows the detail of concealed information (such as who has been to the criminal scene of a homicide case), the next time encountered by the roughly same but slightly modified picture of the scene (such as sweeping out the bloodstains on the wall), he/she will pay more attention and longer fixation duration on the modified areas (comparing to an innocent examinee). This study aims to provide evidences to this new paradigm.
With an experiment covered by a story of memory research, this study provided the first empirical evidence for the aforementioned new paradigm of deception detection. The results revealed that the number of fixation, instead of the sum or average of fixation duration, could be a reliable index to differentiate participants in those two conditions. Several opinions about the chance and challenge of this paradigm were also proposed in this paper.
Keyword: deception detection, eye movement, visual attention
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