Alpha activity results. A, Sensor-level topological representation of baseline-corrected alpha power for the two different statistical leaning configurations and their difference. Asterisks indicate the sensors from where lateralized posterior alpha power was estimated. B, Source localization of alpha activity. C, Time course of alpha power by distractor probability. After the presentation of the placeholder display, contralateral alpha power decreased similarly for high- and low-probability condition. The left and right dotted lines represent the onset of the placeholder display and search array, respectively. D, Statistical learning (SL) effect on lateralized alpha power. There was no evidence for a modulation of distractor probability on alpha power. Pale dots represent individual median results, white dots represent averaged medians, horizontal solid lines represent averaged means, vertical thick lines represent first (bottom edge) and third (top edge) quartiles.