Waveren Hogervorst, Nouska van (2022) Detecting Subliminal Salient Face Familiarity with Pupillometry. Bachelor thesis, Psychology.
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Abstract
Most people have engaged in lying or information concealment at some point in their lives. Especially in crime-related settings, guilty individuals go to great lengths to appear truthful and innocent. To detect if someone is lying or hiding familiarity with certain knowledge, different methods have been adopted to measure their physiological responses (e.g., fMRI or EEG measurements). Countermeasures – taken by individuals to confound the results – can be prevented by using rapid serial visual presentation (RSVP), where stimuli are presented very briefly and thereby inhibiting the examinees to influence their bodily response. A previous study showed that familiar faces presented in RSVP can break into awareness, detected by a difference in EEG response. Another study, using RSVP and pupillometry, showed that measuring the pupil size is successful to detect recognition of target and familiar names. Our study investigated whether a combination of these methods (RSVP with face stimuli and pupillometry), is also effective. Specifically, whether a familiar face would break into awareness, detected by a difference in pupil size. 53 participants were asked to focus on a previously unfamiliar face and find it in an RSVP stream. This target face became salient and a significant difference in pupil size was detected. In some trials, a familiar face (Barack Obama) was present. This probe was not linked to a specific task, and thus subliminal. Against our expectations, we were unable to detect a significant difference between pupil size in the probe condition and pupil size in the no target condition. Our findings support the use of face stimuli in RSVP, where physiological responses are measured by pupillometry, but there is more need for research that links this to subliminal salience or concealed information. Keywords: RSVP, pupillometry, face stimuli, familiarity, (subliminal) salience
| 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 Aug 2022 06:48 |
| Last Modified: | 01 Aug 2022 06:48 |
| URI: | http://gmwpublic.studenttheses.ub.rug.nl/id/eprint/1216 |
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