7 The Visual Emitted Potentials: Clues for Information Processing
Review articleOpen access

Three kinds of endogenous brain event-related potentials are described: an N200 wave peaking in the parieto-occipital region, the duration of which increases with perceptual processing; a biphasic N2-P3a complex peaking in the central areas, probably related to “active” orienting and overlapping in onset with the terminal phase of the parieto-occipital N200; a parietal P3b wave generated mostly after the motor response. These findings suggest that the process reflected by N2-P3a is dependent upon cognitive decision indexed on line by the parieto-occipital N200 and develops concurrently with the end of stimulus categorization, the parietal P3b being generated after these stages.

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