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Group-averaged ERPs elicited by deviant (dotted line) and identical control (dashed line) sounds of 175-Hz base frequency (musical note F3) at three central electrode locations (C3, Cz, and C4). Deviant-minus-control difference waveforms are plotted in black (solid line). Stimulus onset is at the crossing of the axes. Time windows for amplitude measurements (78–98 and 198–218 ms) are shaded gray.
