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. 2017 Sep 4;7:10363. doi: 10.1038/s41598-017-09975-8

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© The Author(s) 2017

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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Task details of Experiment 2. (A) Sample search arrays for different set sizes and target saliency conditions. The center of each item was located 65 mm (ca. 5.3°) from the central fixation. (B) Timeline of the search task: Search arrays presented after a 2500-ms fixation. For the task version that included the auditory cues, a sound was presented during the fixation period, and the search array presented at the sound offset. For both versions participants were given a maximum of 3500 ms to find the target. Next trial started after a 3000-ms inter stimulus interval.