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Phasic responses of the pupil were greater for no-go than for go trials in both (a) Experiment 1 and (b) Experiment 2. Shaded regions around the curves indicate the standard errors of the means. The areas with gray background denote the window of interest to test the effect of trial type on task-related pupil changes (i.e., 700 to 1,000 ms after stimulus onset)
