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

FIGURE 2.

FIGURE 2

Representative examples of the tremor and the firing of a MU observed in a patient (#21) at rest. (A) Auto-spectrum of hand acceleration displaying the primary (5.5 Hz, vertical dashed line) and secondary (7 Hz, arrow) components of tremor as well as the first harmonic of the primary component (arrowhead). (B) Auto-spectrum of a MU to display the primary (vertical dashed line) and secondary (arrow) components of tremor as well as several harmonics of the primary component (arrowheads). (C) MU/Acceleration coherence displaying the primary (vertical dashed line) and secondary (arrow) components of tremor as well as the first two harmonics of the primary component (arrowheads). (D,F) Auto-spectra of hand acceleration using only epoch-II (D) or epoch-I (F) intervals (total duration 66 and 54 s, respectively). Symbols as in (A). Note the absence of the secondary component in (D) and of the primary component in (F). (E,G) Traces corresponding to the accelerometer raw signal (bottom), the MU spike train (middle) and the intramuscular raw EMG signal (top) recorded simultaneously from the patient during epoch-II (E) or epoch-I (G) intervals. The mean firing rate of the MU was 14.0 Hz in both (E,G).