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. 2015 Aug 4;9:435. doi: 10.3389/fnhum.2015.00435

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Copyright © 2015 Geng, Blumenfeld, Tyson and Minzenberg.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Change in normalized pupil diameter on correct trials plotted together for: (A) E1A and E2_nofeedback (B) E1B and E2_feedback; and on error trials for (C) E1A and E2_nofeedback (D) E1B and E2_feedback. The difference between experiments were more pronounced on correct trials compared to error trials, suggesting that increased attentional uncertainty in the more difficult search task produced larger task-related changes in pupil size.