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. 2018 May 1;12:179. doi: 10.3389/fnhum.2018.00179

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Copyright © 2018 Agapaki, Christakos and Anastasopoulos.

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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The proportion of single-spikes, spike doublets and triplets, depends on the firing rate of the MU (f_U) and the frequency of the tremor (f_T) during epoch-II intervals. Note the linear relationship between the incidence of single-spikes (red; N = 49) and the ratio f_U/f_T. Also note the linear increase of the incidence of doublets (open green; N = 48) up to f_U/f_T = 2 and its decrease above this value (solid green; N = 13). Finally note the linear relationship of the incidence of triplets (blue; N = 13) to the ratio f_U/f_T.