Kroner, Tobias (2023) Hidden Hiding Places: Detecting Concealed Information in a Mock Crime Scenario Using Pupillometry and RSVP. Bachelor thesis, Psychology.
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Abstract
Concealed information testing (CIT) makes use of involuntary physiological reactions to detect hidden knowledge and is relevant to forensic applications. To curb common countermeasures, studies have used rapid serial visual presentation (RSVP), a method where stimuli are presented on the fringe of awareness. Since pupil dilation indicates stimulus salience and recognition, a novel and practical research paradigm for deception detection is the combination of RSVP with cognitive pupillometry. Measuring pupil size in a mock-crime scenario, previous studies have found participants’ names to elicit a clear dilation reaction during an RSVP task, even when concealed and task-irrelevant. With a convenience sample of 57 Dutch psychology students, our study aimed to conceptually replicate these findings with another category of stimuli. Next to mean pupil size we also used mean rate of pupil size change (derivative) as additional measure. Using location names that were made salient during the experiment, we found a significant difference between a task-irrelevant real hiding location and controls for mean pupil derivative but not for size on a group level (in the predetermined time-window of 600-900 ms after stimulus onset). Classification analysis with these features revealed a hit-rate of 16% and 4% on an individual level respectively. To increase discriminability and reliability of this CIT method, future research could combine several ocular measures, use autobiographical stimuli, and enlarge the time-window to 600-1000ms.
| 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 14:09 |
| Last Modified: | 01 May 2023 14:09 |
| URI: | http://gmwpublic.studenttheses.ub.rug.nl/id/eprint/1923 |
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