Higher prearray alpha lateralization was associated with successful distractor suppression. A, B, Grand average ERPs recorded at electrodes contralateral and ipsilateral to cued (A) and noncued (B) distractors on trials with higher prearray alpha power contralateral to the distractor location (top). Grand average ERPs on trials with lower prearray alpha power (middle). Contralateral-minus-ipsilateral difference waves (bottom). Gray-shaded boxes represent analysis windows for early P_D (130–180 ms), P_D (205–260 ms), and N2pc (265–330 ms) components. Results of tests comparing the signed area between high- and low-alpha conditions are indicated in the corner of the corresponding shaded region. ns, not significant; *p < 0.05; **p < 0.01.