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. 2021 Jan 8;11:143. doi: 10.1038/s41598-020-80229-w

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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The group average biased (a) amplitude, (b) signal-to-noise ratio (SNR), and (c) laterality index as a function of modulation frequency. The mean is represented by the solid line and the shaded area reflects the range between the mean ± one standard deviation. The solid black line and the gray area in panel A show the average neural background noise across channels ± one standard deviation, respectively. The individual LIs are represented by the dots in (c).