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. 2019 Apr 15;9:6049. doi: 10.1038/s41598-019-42615-x

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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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Panel A illustrates the topography of the results as determined by the cluster-based permutation test contrasting the Task and No Task conditions. As indicated by the warmer colors on the spectrum (reflecting the t statistic, with critical t values at +/−2.052), the difference was most pronounced at the fronto-central electrode sites. That is, theta power (3–6 Hz) measured at these sites (F3, Fz, F4, FC1, C3, CP1) was higher in the Task than in the No Task condition. Note that this comparison is based on the fixation cross period. Panel B displays power values as a function of frequency (Hz) separately for the Task (pink) and No Task (green) condition. Power values were averaged across electrode sites of the positive cluster (F3, Fz, F4, FC1, C3, CP1). Shaded areas represent the standard error of power values.