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. 2018 Nov 12;8:16666. doi: 10.1038/s41598-018-34910-w

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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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Performance in functional tasks. (A) Performance in the Object Location Task, (B) Shape Recognition Task, (C) Compliance Recognition Task and (D) Force Control Task for all the subjects in amplitude and frequency modulation modalities. The circles indicate the partial performance for each condition (e.g., for object recognition, the performances in recognizing the location on the median area, the ulnar area, or both). The dashed lines show the chance levels. In every functional task, N = 90 repetitions were performed for each subject in each condition. Fisher’s exact test was used to test the difference between amplitude and frequency modulation performance. No significant difference in the performance was found (p > 0.05).