Figure 4
From: Mechanical vibration does not systematically reduce the tremor in essential tremor patients

Effect of the different stimulation strategies on the tremor of three representative patients (P4, P9 and P15). Each panel compares the Pre-stim epoch (blue) with its correspondent two minutes Stim epoch (Stim1 + Stim2; in red). Each histogram is the distribution of tremor amplitude in 1 s bins for the corresponding stimulation condition. Top errorbars: mean ± SD; * denotes that the Pre-Stim and Stim epochs are significantly different (P < 0.01, Mann-Whitney U test).