Spectral power and ITPC dynamics (mean across all subjects). A, Time–frequency spectrograms of the spectral power (left) and ITPC (right) demonstrating the change in power and phase coherence as a function of time, with color representing the amplitude of change relative to the prestimulus interval (−200 to 0 ms) in percentage change units. B, Time courses of four frequency bands: theta (4–7 Hz; black lines), alpha (8–13 Hz; light gray lines), beta (14–20 Hz; light gray dotted lines), and low-gamma (25–40 Hz; dark gray dotted line). Area marked in gray (150–400 ms) corresponds to time window with sustained neural variability quenching in Figure 3.