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. 2020 Jul 15;8:800. doi: 10.3389/fbioe.2020.00800

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Copyright © 2020 Torricelli, De Marchis, d’Avella, Tobaruela, Barroso and Pons.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Delays and amplitude difference of the peak of EMG envelopes with respect to the PRE trial, across the 10 subjects. Rows represent the three muscles TA, VL, and GM. Columns represent the three different experimental sessions, each considering a different muscle for visual biofeedback. Bars represent the mean delays across subjects in degrees (scale shown on the right side). Solid lines represent the gain of the amplitude difference (scale shown on the left side). The vertical lines represent the standard deviation across subjects.