Day 9: Your pupil size can offer information about your cognitive load, making it a seemingly accessible marker for tracking mental effort. But using that information outside of the lab is more challenging than it sounds.
The pupil also changes size in response to light. The type of light itself can also influence how much the pupil dilates. And changes in lighting can cause much larger pupil responses than cognitive load itself, making it difficult to isolate mental effort without careful controls. As if that weren’t enough, other factors like emotion, fatigue, what you’re looking at can also affect pupil size, adding more noise outside the lab.
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