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Example of the left parietal ERP old/new effect (Rugg, unpublished data). Waveforms elicited by three classes of test item in a source memory experiment are displayed at a left parietal scalp site (left panel). The arrow indicates the effect’s peak. The topography of the effect (right panel) is shown as a subtraction of the source incorrect waveforms from the source correct waveforms from 500 to 800ms poststimulus onset.
