Trial-by-trial oscillatory power correlates of P(stop), go-RT, and PE at channel FCz. A, Correlation between fixation-locked (onset at 0 ms) power and P(stop) at each time–frequency bin. Trial-by-trial oscillatory power correlates of P(stop), go-RT, and PE at channel FCz. A, Correlation between fixation-locked (onset at 0 ms) power and P(stop) at each time–frequency bin. The color represents the z-value of Spearman correlation, and the black contours represent statistically significant time–frequency clusters in the nonparametric cluster-based permutation test across participants, with clustering threshold at p < 0.02, 0.005, and 0.001 levels (see Materials and Methods for details). It showed a positive correlation in the intervals 3–5 Hz and 0–200 ms. B, No clusters showed a significant correlation between go-locked power and P(stop). C, No clusters showed a significant correlation between fixation-locked power and go-RT. D, Correlation between go-locked power and go-RT, with the permutation test showing a negative correlation in the intervals 2–8 Hz and 200–700 ms. E, The coefficient of trial-by-trial Pearson correlation between the mean power of the clusters identified in A and D of individual participants. Wilcoxon signed rank test showed that the correlation coefficients across participants were significantly below zero. F, G, Correlation between stop-locked power and PE, with the permutation test showing a positive correlation in the intervals 12–22 Hz and 300–400 ms. The topographies of each correlational cluster (p < 0.005) are shown in the bottom panel, where H, I, J, and K each show the cluster of A, D, F, and G, all with the strongest correlations at the midfrontal region. We performed the same analyses at Pz channel (Fig. 2-1). Andrew Chang et al. eNeuro 2017;4:ENEURO.0061-17.2017 ©2017 by Society for Neuroscience