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Outline of the illuminance task. After a baseline period of 45 s, participants were presented with circles of four different illuminance levels (diameter: 16.58°). In the continuous illuminance task, these circles remained on screen for 5 s. In the illuminance flashes task, they remained on screen for 200 ms. Participants were asked to fixate a red cross throughout the task. Both the onset and the offset of the circles elicited pupil responses.
