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. 2013 Nov 27;7:819. doi: 10.3389/fnhum.2013.00819

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Copyright © 2013 Olsson and Lundström.

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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Experimental setup. The video clips lasted for about 2 s depending on which occlusion (easy, medium, difficult) that was observed. There was no time limit for the response. The participants viewed a total of 120 video clips.