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. 2019 Feb 25;9:2659. doi: 10.1038/s41598-018-38262-3

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© The Author(s) 2019

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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Experiment 1b. (A) Performance (d′) as a function of mask SFs in the Covert attention (control) experiment. Error bars represent standard deviation of the bootstrapped distribution. (B) Difference of d′ between the covert attention and neutral conditions. Error bars represent standard deviation of the bootstrapped distribution. n.s. = no significant difference. (C) Scatter plot of performance of individual observers for each of the three masking SFs.