(A) The raw LFP signal was filtered around the gamma range (40–90 Hz) and for all contact pairs of one electrode, the same threshold was set at the 75th percentile of the gamma amplitude of the entire recording. A burst was considered when the duration of threshold crossing (black line) was at least one gamma cycle long (black dot). Shown are six trials of the large movement condition from the same patient (Subject 2, right hemisphere, contact pair 1–2) and the averaged time-frequency plot across large condition trials for this patient (bottom row). After movement onset (dashed line), the rate of transient synchrony in gamma bursts increases while the overall level of gamma power appears unchanged. Gamma bursts occur at different time points within each trial leading to a seemingly continuous gamma synchronization when averaging across trials (bottom row). (B) When averaged across patients (n = 16, ON-state), gamma bursts show increased rate, amplitude and duration during movement (grey bar – MOV), compared to baseline (black bar – BL). (C) Averaged correlations of changes in gamma-power and –burst properties for each patient showed significantly higher correlation with increases in burst rate (light grey - Rate) than burst amplitude (grey - Amp) or duration (black – Dur). (D) Relative changes of burst rate show a stepwise increase toward the large movement condition. (E) Burst rate increase correlates with clinical state. UPDRS-ON scores were available in 14 patients. Across these patients, a significant negative correlation (Pearson’s r = −0.6, p=0.008) was seen between increases in burst rate during movement and the UPDRS-III motor score. (F) When comparing averaged increases in burst rate, amplitude and duration ON and OFF medication (n = 7), only burst rate showed a significant decrease, while movement-related increases in burst duration and amplitude seemed not associated with the dopaminergic state. * indicate p-values<0.05; **p<0.01; ***p<0.001.