Fig. 3

Topographically selective increases in post-stimulus amplitude predict accuracy. a The timecourse of alpha amplitude on correct (blue) and incorrect (red) trials in the contralateral and ipsilateral electrodes indicated in Fig. 1. Amplitude timecourses are baselined to −1000 to −750 ms pre-stimulus, and shaded areas indicate ± 1 SEM within subject. b Alpha amplitude decreases more on correct compared to incorrect trials in both contralateral and ipsilateral electrodes. Furthermore, the decrease in alpha amplitude is topographically selective, displaying larger decreases contralateral to the target. Topographic plots indicate the difference between correct and incorrect trials averaged over 100 ms bins centered on 0.4, 0.65, and 0.9 s after stimulus onset. All dots indicate significance from zero, evaluated by comparing the obtained t-value with a null distribution of t-values computed by shuffling the condition labels 10,000 times. This analysis was done on a timepoint-by-timepoint basis from stimulus onset to + 1 s, as indicated by the non-shaded areas (see Methods). Main effects with P < 0.05 are indicated in black, and gray dots indicate significance after FDR correction at P = 0.05