Figure 5.

Time–frequency plots for stop trials. A–C, Power expressed with color as a t-score is plotted for patients ON stimulation (A), OFF stimulation (B), and controls (C). Note the predicted response in the beta-band for controls and patients ON stimulation. Zero milliseconds was the time of the SS (indicated with the standard dotted line). Power changes that are significant at p < 0.05 are encircled with either a black line (for increases above baseline) or a red line (for decreases below baseline). D, Average beta power from 15 to 17 Hz using a prestimulus baseline (−500 to 0). For controls, there is an increase in beta power before SSRT elapses. Patients ON stimulation show a slightly later increase consistent with a longer SSRT. There is no discernable beta increase for patients OFF stimulation.