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. 2018 Feb 9;12:53. doi: 10.3389/fnins.2018.00053

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Copyright © 2018 Jean-Xavier and Perreault.

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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Temporal relationships and coupling strengths between MNs of different motor columns before and after removal of the brain stem. (A,B) Inter-columnar phase relationships between pairs of MNs in left and right MMC in L2, MMC and LMC in L2, and MMC and LMC in L5 before and after removal of the brain stem. Phase relationships between MMCs are shown in red and phase relationships between MMC and LMCs are shown in purple. Removal of the brain stem did not significantly change the mean phase differences between MNs (Watson–Williams F-test, L2 lMMC/rMMC^before vs. lMMC/rMMC^after F = 0.03, p = 0.87; L2 MMC/LMC^before vs. MMC/LMC^after F = 0.60, p = 0.45; L5 MMC/LMC^before vs. MMC/LMC^after F = 0.21, p = 0.65). (C) Bar graph showing mean coherence before (solid bars) and after (hatched bars) removal of the brain stem. The strengths of the coupling between MNs was not significantly affected by removal of the brain stem (Wilcoxon matched-pairs test, L2 lMMC/rMMC^before vs. lMMC/rMMC^after p = 0.19; Kruskal-Wallis test followed by a Dunn's multiple comparison, L2 MMC/LMC^before vs. L2 MMC/LMC^after p > 0.99; L5 MMC/LMC^before vs. L5 MMC/LMC^after p > 0.99). ^***p < 0.001. For other details, see Figure 4.