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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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Representative example of physiological tremor and the firing of a MU in a control subject (#5) while maintained stable posture. (A) Traces corresponding to the accelerometer raw signal (bottom), the MU spike train (top) recorded simultaneously from the control subject. The rhythmical firing rate of the MU was at 14.5 Hz (mean firing rate of the MU) and the frequency of the tremor at 8.5 Hz. (B) Auto-spectrum of the hand acceleration displaying a single peak at the tremor frequency (arrow). (C) Auto-spectrum of the MU displaying a large peak at the frequency of the mean firing rate of the MU (asterisk) and a small deflection at tremor frequency (arrow). (D) MU/Acceleration coherence displaying a small but significant peak at tremor frequency (arrow).