Hettema, David (2023) Do your eyes tell the truth? Detecting concealed information using RSVP and pupillometry. Bachelor thesis, Psychology.
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Hettema, D.D. - Bachelorthesis - Do your eyes tell the truth. Detecting concealed information using RSVP and pupillometry.pdf Download (604kB) | Preview |
Abstract
This study uses Rapid Serial Visual Presentation (RSVP) combined with a Concealed Information Test (CIT) to detect concealed information using pupillometry. In this experiment, participants (N = 49) chose a hiding location (probe). They received another location and pretended it was theirs (target). This study wants to determine if mean pupil size and derivative can be used as classifiers of concealed information. The results show no significant difference between the probe and control conditions for mean pupil size in a time window of 600-900 ms after the onset of the critical stimulus. The target is, as expected, significantly larger than the control conditions. For pupil derivatives both the probe and the target conditions are significantly larger than the control conditions. Both control conditions, however, also differ significantly, making it difficult to interpret these results. On the individual level, mean pupil size and pupil derivative correctly classified respectively 4% and 16% of the participants. A post hoc analysis (N = 46) on a wider time window of 600-1000 ms shows that for pupil derivatives both the target and probe are significantly larger than the control conditions, but the control conditions no longer differ. These results lead us to conclude that mean pupil size can not be used as a classifier of concealed information. Derivative pupil size might be a good classifier on a wider time window. Future research must show whether the wider time window is useful and should assess derivative pupil size more often as a possible classifier.
| Item Type: | Thesis (Bachelor) |
|---|---|
| Supervisor name: | Mijn, W.R. van der |
| Degree programme: | Psychology |
| Differentiation route: | None [Bachelor Psychology] |
| Date Deposited: | 02 May 2023 09:49 |
| Last Modified: | 02 May 2023 09:49 |
| URI: | http://gmwpublic.studenttheses.ub.rug.nl/id/eprint/1926 |
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