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. 2020 Jun 30;10:10625. doi: 10.1038/s41598-020-67403-w

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© The Author(s) 2020

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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The consistency of hierarchical clustering between EMG and Ia within and across movements. (A) Fowkles–Mallow Index (B) for the comparison between EMG and Ia cluster assignments (red) and for the comparison between EMG and permuted Ia cluster assignments representing random match (black) at different cluster subdivisions. Error bars show pooled standard deviation across participants. (B) Histograms of the differences in B_Ia and B_EMG between tasks across bootstrapped hierarchal cluster trees. The abscissa indicates no difference in B values between tasks; the thick line is at the mean of the distribution; thin lines show standard deviations of the distributions.