Rectangular regions of interest (ROIs) were defined within the time-frequency analysis plane by specifying, for each ROI, a band of frequencies and a time interval relative to the stimulus onset time. Time 0 in these definitions is the onset of the stimulus. The ROI frequencies in both human and animal studies were: delta (1-4 Hz), theta (4-7 Hz), alpha (7-13 Hz), and beta (13-30 Hz). The ROI time intervals were delta (200-500 ms), theta (10-400 ms), alpha (0-300 ms) and beta (0-300 ms). ROI time intervals were selected based on ERO energy in specific ERP component locations (N1, P3) in previous ERP studies [42]. Using mean values over trials, the maximum values were calculated for each ROI, for each electrode location or, for PDLI, for a pair of electrode locations (FZ-PZ) for energy (E), PLI amplitude, and PDLI amplitude.
