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Exploring Pupil Diameter as a Lie Detection Method

Title: Exploring Pupil Diameter as a Lie Detection Method.
Name(s): Gonzales, Violeta, author
Type of Resource: text
Genre: Text
Bachelor Thesis
Date Issued: 2018-11-28
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Summary: Traditional methods of lie detection (e.g., polygraph, GSR, heart rate) have often led to more controversy than successful detection. Leading the charge into the future of lie detection technology is eye-tracking, a young and innovative field that represents a new and promising strategy for addressing deception by measuring eye movements, pupil size, and attentional allocation. This experiment examined the body’s physiological reactions to engaging in deception by using pupillometry. We examined and compared these physiological responses between two conditions: being told to tell a lie or the truth. We also examined the effects of the lie being told spontaneously compared to knowing in advance that a lie would be produced, as well as the effect of practice. With the use of a rapid serial visual presentation (RSVP) paradigm, participants looked at a continuous stream of visual images (i.e., letters) and were asked to report (or lie about) the letter of a unique color (black letter among gray letters). Participants were prompted at the end of the trial to either report the letter correctly, or to lie about it. On some trials, this prompt occurred in advance of the letter stream so participants could prepare to lie, and for other trials it occurred at the end and participants had little opportunity to prepare their lie. It was predicted that lies would be characterized by an increase in pupil size, but this prediction received limited support. With regard to reaction time, lie responses took significantly longer, and there was a trend for this cost to decrease with practice. So while lies were successfully detected, the implementation of pupillometry was not successful, and future research is suggested in order to collect more powerful results from a stronger paradigm.
Identifier: FSU_libsubv1_scholarship_submission_1544654398_5c390da3 (IID)
Keywords: eye-tacking, lie detection, deception, RSVP stream
Persistent Link to This Record:
Host Institution: FSU

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Gonzales, V. (2018). Exploring Pupil Diameter as a Lie Detection Method. Retrieved from