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The ERPs of valid and invalid stimuli in LVF (a) and RVF (b) after ERP subtraction. Time zero is the onsets of the cues, and 150 ms is the onsets of the stimuli (marked by an arrow). Attentional modulation on the P1 and N1 components was consistently observed at posterior sites (P3/P4, OL/OR, T5/T6) contralateral to stimulus side.
