These are the grand average event-related potentials to ungrammatical, semantically incongruous, and comparable grammatical/congruous sentence final words. Electrodes below the head's equator are displayed progressively beyond the radius of the head. The N400 and P600 effects are visible in the left and right difference waves (respectively) animated in the bottom row.
For full details see:
Groppe DM. (2007) Common independent components of the P3b, N400, and P600 ERP components to deviant linguistic events. Unpublished Ph.D. Dissertation, University of California, San Diego.
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