Chunk #38 — 4 Discussion — 4.2 EEG discriminating components during the P3 and around reaction time reveal a period of transition from externally driven task-related to internally-driven processing
Our middle windows, which occurred close to the behavioral response and in the range of the P3, revealed a superposition of task-related and endogenous attention areas (Figure 5). Similar to the early windows, task-related BOLD correlations were found in right middle frontal gyrus and superior LOC. We also found an activation in right inferior frontal gyrus, an area associated with reorienting to salient behaviorally-relevant stimuli and is a main node in the right-hemisphere ventral attention network (VAN) (Corbetta and Shulman, 2002; Corbetta et al., 2008). Right-hemisphere frontal areas have been shown by a number of recent EEG-fMRI studies to modulate with P3 amplitude during visual (Bledowski et al., 2004a) and auditory (Eichele et al., 2005) tasks, and were reported for the latter case at a similar latency.
