Boer, Wytze de (2025) Influence of Pupil Size on Visual Detection Performance under External Visual Noise Conditions. Bachelor thesis, Psychology.
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Abstract
This study explored the effect of pupil size on visual detection performance at different levels of external noise. Participants completed a visual detection task modified with 1/f noise. Pupil size was measured and data were analyzed using RM-ANOVAs. Visual detection performance decreased significantly as noise level increased for both small and large pupil sizes. Larger pupil sizes were associated with a significantly better performance compared to smaller pupil sizes. No interaction effect was found between pupil size and noise level. Finally, no significant effects in performance over time in a block of trials were found. This study provides a novel approach on visual detection and sensitivity by incorporating external visual noise for the first time. The findings reinforce that large pupils are associated with better visual sensitivity. Practical implications include improving task designs and executions where visual detection is critical, such as aviation. Future research should explore the neurocognitive mechanisms underlying these effects, further investigate the absence of an interaction effect, and look for adjusted ways to analyze performance over time. Keywords: Pupil size, Visual Detection Task, External Visual Noise
| Item Type: | Thesis (Bachelor) |
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| Supervisor name: | Ruuskanen, V.H.S. |
| Degree programme: | Psychology |
| Differentiation route: | None [Bachelor Psychology] |
| Date Deposited: | 22 Jan 2025 09:06 |
| Last Modified: | 22 Jan 2025 09:06 |
| URI: | http://gmwpublic.studenttheses.ub.rug.nl/id/eprint/4521 |
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