Figure 6.

Baseline pupil size under constant luminance predicts changes in attentional priorities. (A) In the distraction task (Figure 1A), large, salient distractors are presented in conflict with a rewarded target. Monkeys are faster for congruent distractors and slower for incongruent distractors (Figure 1C). Increasing pupil size magnifies these effects: attention is more affected by the distractors when pupil size is large. (B) In the same task, we can also measure the probability that monkeys would make an “errant saccade” to a task-irrelevant distractor, rather than a rewarded target (these trials were excluded from analysis in A). Errant saccade likelihood increases as a function of pupil size at fixation. Panel (A) is modified from Ebitz et al. (14) and is reproduced under a Creative Commons Attribution license. Panel (B) is modified from Ebitz and Platt (77) with permission from Cell Press and Elsevier.