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. 2019 Dec 3;9:18226. doi: 10.1038/s41598-019-54763-1

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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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Power changes in alpha-band for the entire time course of the trial for the FC2, C4 and O2 electrodes. The expert group is represented in blue and the novice group in red with the standard error of the mean (SEM). The grey shaded areas are the periods of significant between-group differences. The bar graphs represented the alpha ERSP values averaged over the whole epoch. Error bars indicate the standard error of the mean.