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. 2019 Feb 11;10:40. doi: 10.3389/fpsyg.2019.00040

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Copyright © 2019 Li, Li, Liu, Lages and Stoet.

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) and the copyright owner(s) 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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Illustration of the stimuli in Experiment 1. Four unique target stimuli were presented in the color task (top left), and four unique target stimuli were presented in the shape task (bottom left). Con = trial with congruent target; Inc = trial with incongruent target. Target stimuli based on white circles and black hexagons were congruent targets because both task-features (i.e., color and shape) lead to the same response in the two different tasks according to the task rules. Target stimuli based on black circles and white hexagons were the incongruent targets because each task-feature lead to different responses according to the task rules. Each target had at least one distinctive task-irrelevant feature.