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Grand average ERPs at the representative electrodes for each participant group (A. Young Controls B. Older Adults and C. Agrammatic patients) elicited by the correct sentences (solid line) and verb argument structure violation (broken line) at the position of the deteminer. The voltage maps show topographical distribution of ERP effects across the scalp based on the difference waveforms (violation-correct) at 300–500, 500–700 and 700–800 msec time intervals.
