Fig. 3: Increased cue-triggered delta activity predicts decreased temporal variability in controls but not in Parkinson’s disease (PD).

We plotted the slopes for each individual from our trial-by-trial linear mixed-effects model trial-by-trial delta power on keypress. This analysis revealed that for a controls, increased midfrontal delta power was associated with keypress that was more clustered around ~7 s; individual slopes plotted as blue lines. However, for b PD patients, there was no clear relationship between delta power and keypress; individual slopes plotted as red lines. These data indicate that for controls, increased delta power was linked with less timing variability, while PD patients (who had lower delta power overall, see Fig. 2b) had higher timing variability and less of an influence between delta power and performance. Data from all trials in control (n = 37) and PD (n = 71) patients.