Figure 3.
Time–frequency plot showing LFP activity after the end of HFS at time 0 expressed as a percentage change from baseline activity taken from 100 to 140 s after cessation of stimulation. Top, Mean relative power across 12 sides shows a suppression of β activity after HFS (blue colors) followed by a relative increase in β power (red colors) that was observed in some patients. Bottom, Corresponding Z scores as determined by Wilcoxon's signed rank test thresholded at Z = ±1.9, confirming significant β suppression that persists for ∼20 s after the end of HFS.