Figure 1.

A subset of the stages involved in information processing in a cued target-response task. A, Following the onset of the cue, it must undergo visual sensory processing (indexed by the N1 and P1 event-related potential components). B, Extraction of cue meaning can be electrophysiologically indexed by the P3a component. C, Target expectation or preparation proceeds the extraction of cue meaning, and can be indexed by the CNV or alpha power. Additionally, between the onset of the cue and that of the target, attention must be shifted from the cue to the target stimulus.