Fig. 6.

Sustained α power suppression measured in experiment 2. The top panels shows the contralateral (left) and ipsilateral (right) α power suppression for matched distractor conditions. The middle panels show the same for one-distractor condition, and the bottom panels do for the eight-distractor condition. The time windows for the stimulus onset and sustained α power suppression are highlighted accordingly. The bar graphs show the mean α power for each set size. Error bars on the bar graphs represent SEs. The asterisks represent the results of planned t-tests (where * is <0.05 and ** is <0.01).