Possul, Janette (2023) Detection of Concealed Information in a Mock-Crime Scenario Using Pupillometry and Rapid Serial Visual Presentation. Bachelor thesis, Psychology.
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Abstract
Concealed information testing (CIT) has been researched extensively as an evidence-based method to identify individuals with crime-related knowledge. However, CIT relies on physiological responses that can be voluntarily manipulated, leading to confounded results. Combining CIT with rapid serial visual presentation (RSVP) can improve this issue, while pupillometry may provide a more feasible indicator of cognitive processes compared to other physiological measures. We combined CIT, RSVP, and pupillometry to test whether pupil size and the rate of change in pupil size (derivative) are larger when participants are presented with crime-relevant stimuli compared to crime-irrelevant stimuli. We designed a within-subjects experiment, where participants took part in a mock crime after which they completed an RSVP task while their pupil reactions were recorded. While we found no significant group-level differences for the pupil size (α < .05), the derivative showed a significant difference (α < .05). However, the control condition yielded a significant difference as well. At the individual level, using t-tests, two participants showed a significant mean pupil size difference in pupil size and 12 participants showed a significant difference in the derivative, resulting in hit rates of 4% and 16% respectively. These findings are different from the previous study using the same paradigm, however, we demonstrated that the derivative is potentially a more sensitive measure than pupil size. Research on combined CIT, RSVP, and pupillometry is scarce, and further investigation is needed to explore the optimal conditions suitable for field use. Keywords: pupillometry, rapid serial visual presentation, mock crime, concealed information testing
| Item Type: | Thesis (Bachelor) |
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| Supervisor name: | Mijn, W.R. van der |
| Degree programme: | Psychology |
| Differentiation route: | None [Bachelor Psychology] |
| Date Deposited: | 01 May 2023 14:00 |
| Last Modified: | 01 May 2023 14:00 |
| URI: | http://gmwpublic.studenttheses.ub.rug.nl/id/eprint/1921 |
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