Fig. 3

Results of high intensity stimulation amplitude at 1.5*RT in one subject (PD4). The figure shows the time series and the power spectral density (PSD) estimated by Welch method in three time periods during one trial of each EMG (a) and DOF (b). The horizontal line in chartreuse indicates the electrical stimulation in time series. PSDs of prior to stimulation are presented in blue, during stimulation in red and after stimulation in green. The frequency of the peak between 2 to 7 Hz in the PSD that calculated as the tremor frequency is listed