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. 2018 Aug 8;8:11878. doi: 10.1038/s41598-018-30343-7

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Stimuli and sequence of events for a single trial in Experiment 1. Each trial started with an isoluminant red fixation mark and two peripheral squares. An arrow (the cue) followed, instructing observers which side to attend. Next, the Ts and disks appeared simultaneously and the Ts rotated for 6 sec. The distances of the disks from each T were varied to derive the attentional window size. Each distance was kept constant during a block of 56 trials and varied randomly across different blocks. Cue direction, the side at which the bright and dark disks appeared, and target-disks distances varied randomly within a block.