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. 2018 Mar 12;8:4365. doi: 10.1038/s41598-018-22588-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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Forces, sEMG signals and recurrence plots from one representative subject. (a) Forces of the thumb and index finger in the whole course of precision grip. The phase 20–40 s was the period with visual feedback; and the phase 50–70 s was the period without visual feedback. (b,c) The sEMG of the APB and FDI at the same time; (d,e) sEMG of the APB and that of the FDI within 1 s; (f,g) recurrence plots for the sEMG signals of the APB and FDI within 1 s.