Event-related potentials (ERPs) and alpha power during passive trials for Experiment 2. Single, double, and triple asterisks indicate quantities significantly greater than zero at the 0.05, 0.01, and 0.001 significance levels, respectively. A, Grand average ERPs from Experiment 2 with passive trial average (gray trace) superimposed over attend-left (blue) and attend-right (red) trials. B, Effects of attention on the magnitude of N1 responses, relative to passive conditions, calculated as Attentional Enhancement and Ignore Suppression. C, Effects of attention on the strength of parietal alpha oscillations, relative to passive conditions, averaged over the cue period. D, Difference in alpha power with respect to the passive condition, calculated separately for left and right parietal sensors.