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Exploring the effects of size and luminance of visual targets on the pupillary light reflex

In driving simulator studies pupil diameter is often employed as a physiological measure of cognitive load. However, pupil size is primarily influenced by the pupillary light reflex (PLR). In this paper, we explore the influence of the size and luminance of visual targets on the PLR. Our results indicate that even for small targets (angular radius of 2.5°) changes in luminance can result in PLR that can obscure cognitive load-related pupil diameter changes. We propose a weighting function to be used to predict the PLR and present initial results that support its utility.