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. 2018 Jun 11;12:207. doi: 10.3389/fnhum.2018.00207

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Copyright © 2018 Dideriksen, Negro, Falla, Kristensen, Mrachacz-Kersting and Farina.

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 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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Linear correlation analysis between average coherence (0–35 Hz; A), the peak in the delta band (0–5 Hz; B), the peak in the alpha band (5–15 Hz; C), and the peak in the beta band (15–35 Hz; D) calculated between two CSTs and the two surface EMG recordings [raw, rectified, or high-pass filtered (>250 Hz) before rectification]. The contraction level was 10% MVC and CSTs consisting of three motor units each were used. The thin, gray, dashed lines indicate the confidence limits for coherence (0.05; not visible in all panels due to truncation of axes). Note that the figures show raw coherence values, but p-values were calculated based on Z-transformed coherence values. Significant correlations (p < 0.05) are indicated by bold font.