Figure 1.

β-feature extraction from a representative single trial. A, Each trial consisted of a 15 (frequencies) × 117 (time points; 225 ms, 512 Hz) time-frequency power matrix. The 117 time points were divided into nine 25-ms time bins, from −125 ms before SSRT to +100 ms after SSRT. β-bursts were defined as local maxima which exceeded a predefined threshold. B, β-burst rate. Shown are all datapoints exceeding the threshold (2× median power). Each local maximum (indicated with red dashed circle) exceeding the threshold was counted as one β-burst for the time bin where it occurred. C, β-burst volume. All timepoints exceeding the threshold (2× median power) were included for the volume calculation. The volume was spread across the different time bins and frequencies. D, Normalized β-power. The normalized power values over all frequencies were averaged for each time bin (means per time bin are indicated with black line).