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. 2014 Apr 10;5:309. doi: 10.3389/fpsyg.2014.00309

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Copyright © 2014 Ásgeirsson and Kristjánsson.

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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An illustration of the stimuli used in experiment 4. Observers were to locate the target with the odd shape (the green diamond) and report the tilt of the line inside it. The example in the figure shows a trial with an irrelevant singleton (the red circle). Stimuli are not drawn to scale (see Method for details).