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. 2018 May 31;8:8478. doi: 10.1038/s41598-018-26821-7

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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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Trial procedure of the visual search task in the similar and salient conditions. A trial begins with a fixation cross that appears for 500 ms. This is followed by a 200 ms search display. On 50% of the trials, the target co-appears with a similar contrast stimulus. On the other 50% of the trials, the target co-appears with a salient (i.e., higher contrast) one. The trials were separated by a variable fixation interval ranging from 1500 to 2000 ms.