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. 2018 May 30;8:8391. doi: 10.1038/s41598-018-26780-z

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© The Author(s) 2018

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 three clusters of spatial muscle synergies (SC1, SC2, SC3 shown in rows) identified by our functional similarity clustering approach. (A) The average (±sem) muscle activation of the spatial synergies belonging to each cluster. (B) The confusion matrix of all 72 movement directions (averaged across cluster members) for each cluster. (C) Confusion matrices of six task parameters describing the spatial location of the subject’s hand over the entire movement duration: starting bar, horizontal direction and end bar (encoded by SC1) describing the horizontal dimension of motion and starting height, vertical direction and end height (encoded by SC2 and SC3) describing the vertical dimension of motion. Reported values on the bottom-left corner of each confusion matrix represent information values and on the top-right corner percentages of correctly decoded trials (% correct).