Since our analysis separately identifies EEG discriminating components at different time windows relative to the stimuli and responses, we are able to study the temporal cascade of neural involvement related to modulations of internal attentional states. For simplification and clarity in the following discussion, we divided our results into three stages (indicated in Table 1 and Figures 2 and 3): early (prior to behavioral response), middle (at or near RT), and late (after the response while the subject is waiting for the subsequent stimulus). We based these temporal ranges on timing of ERP components at the Pz electrode (Figure 2) such that the early stage corresponds to the P2 and N2, the middle stage corresponds to the P3, and our late windows are those that occur after the P3.
