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. 2015 Jul 10;6:974. doi: 10.3389/fpsyg.2015.00974

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Copyright © 2015 van Steenbergen, Band and Hommel.

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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Flanker task (left column) and Stroop task (right column) pupil dilation across Experiment 2 (A) and 3 (B), as a function of current-trial congruency and previous-trial congruency. Please note that data from the Stroop task in Experiment 2 suggests that there is a current-trial congruency × previous-trial congruency interaction effect. However the task × current-trial congruency × previous-trial congruency interaction effect is not significant.