thinking and doing (also called exploration-exploitation behavior) modulated by the is mediated by the neuromodulatory locus coeruleus-norepinephrine (LC-NE) system. when in exploratory state, the pupil size is larger then in exploitation state. people with tend cry to explore has larger pupil diameter base line<ref>Jepma, Marieke, and Sander Nieuwenhuis. "Pupil diameter predicts changes in the exploration-exploitation exploration–exploitation trade-off: Evidence evidence for the adaptive gain theory ." Journal of cognitive neuroscience 23.7 (2011): 1587-1596.‏APA </ref>