Figure 2A displays group-averaged time-domain voltage waveforms at the parietal site for all externalizing-diagnosis groups and controls. The adjacent head-plot displays the topographical distribution of grand-average P3 scores (mean voltage between 300 and 600 milliseconds) for all subjects. The grand-average EVK distribution (i.e. average time-frequency representation of time-domain ERPs) is presented alongside topographical distributions for corresponding delta and theta scores in Figure 2B windows for scores (denoted by dotted boxes). Pixels with the largest values (“hottest” colors) are consistent with times and frequencies where the voltage in Figure 2A is greatest. Likewise, Figure 2C shows the grand-average PLF loadings and topographical distributions for delta and theta scores. Here, pixels that are “hottest” reflect times and frequencies relative to the stimulus where cross-trial ERP phase is most consistent; similar to the EVK grand-average, PLF pixels of the largest value line-up with the P3-peak. Generally, grand means for delta were larger than those for theta, as reflected by the less intense heat-maps for theta relative to delta (which were plotted using the same color scale). Most extant literature has focused on electrode
