One implication of disentangling this overlap is better measurement of the time course of each of these processes. First, the loss-sensitive theta activity following feedback extended well beyond the conventional FRN time window, into the P300 window, reaching its maximum around 400 ms (cf. Luu, Tucker, and Makeig, 2004). Similarly, delta activity associated with P300 was found to extend earlier in time, occurring during the conventional time-domain FRN window. This also indicated that externalizing-related delta-P300 amplitude reductions in the current study were not isolated to the conventional P300 time-window, extending earlier in time. Interestingly, a recent study using the TF-PCA approach to more effectively index the time-course of delta activity underlying externalizing-related P300 amplitude reductions in a standard oddball task suggested a similar early time course (Gilmore et al., 2009).
