theta and delta processes, and produce better measures of the relevant processes in a feedback task typically indexed with time-domain feedback related-negativity (FRN) and P3 components (E.M. Bernat, Nelson, Holroyd, Gehring, & Patrick, 2008). In that report, the TF-PCA approach revealed statistically independent theta and delta processes, which were summed together in time-domain measures, creating confounded ERN and P3 measures that contained mixtures of the processes indexed separately by the TF measures. For all of these reasons, TF measures may provide a more optimal representation of the activity contained in the signals, and thus components measured in this way may ultimately serve as more parsimonious endophenotypes for externalizing than P3-AR.
