Nguyen, Teresa (2023) Detecting Concealed Location Names with Pupillometry Using Rapid Serial Visual Presentation in a Mock-Crime Scenario. Bachelor thesis, Psychology.
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Abstract
Detecting concealed information can be useful to distinguish between guilty and innocent suspects in law enforcement. A reliable method to test that is the combination of concealed information testing (CIT) and rapid serial visual presentation (RSVP). While CIT relies on physiological responses to salient stimuli to detect concealed information, it is vulnerable to countermeasures that may conduce false negatives. This vulnerability can be reduced by adding an RSVP that presents stimuli so quickly that they cannot be consciously reacted to. Previous research using CIT and RSVP found P3 brain potentials to be significant indicators of concealed information. Alternative indicators may be ocular measurements, specifically pupil dilation and derivatives, since they are comparingly cheaper and user-friendly. In our study, we examine pupil dilation and derivative in response to location names presented in a CIT-RSVP framework as part of a mock-crime scenario. We propose that pupil size and derivative would be significantly larger and steeper in the real hiding location (probe) condition than in control (irrelevants) conditions. Forty-nine participants read a mock-crime scenario and reacted to a task-relevant location (target) in an RSVP stream of probe, irrelevants, and distractors. Applying linear mixed effects regression on a group level, we only found significant differences with pupil derivatives. Employing t-tests, we correctly identified 4% of guilty participants using pupil size, and 16% using pupil derivatives. Overall, this study showed that pupil derivatives are promising indicators for concealed information; however, further testing is required for this paradigm to be considered in law enforcement.
| Item Type: | Thesis (Bachelor) |
|---|---|
| Supervisor name: | Mijn, W.R. van der and Vilotijevic, A. |
| Degree programme: | Psychology |
| Differentiation route: | None [Bachelor Psychology] |
| Date Deposited: | 02 May 2023 09:47 |
| Last Modified: | 02 May 2023 09:47 |
| URI: | http://gmwpublic.studenttheses.ub.rug.nl/id/eprint/1925 |
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