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This paper compares the pupillary activity index to traditional eye-trackingmetrics like the fixation count and duration in assessing neonatal pain. Itexplores the benefits of incorporating pupillary activity measures to improvemethods that lead to an understanding of cognitive processing and performanceevaluation. The estimation of cognitive load using pupil diameter typicallyinvolves measures relative to a baseline. Instead, we conducted an eye-trackingstudy using the Low/High Index of Pupillary Activity to evaluate healthcareexperts and non-experts analyzing the faces with and without pain from adataset of newborn faces. This data was recorded by the Tobii TX300eye-tracking system in a closed room with controlled lighting. Our contributionis to introduce the LHIPA calculation considering the areas of interestsegments of the pupil diameter signal. The results suggest that the visualattention reflected by the traditional metrics may not correspond directly tothe respective cognitive load for both sample groups of participants.

Pupillary activity in areas of interest from visual stimuli for neonatal pain assessment