A, EEG topographic plot of log-transformed relative gamma activity (30–40 Hz) during REM sleep. B, Brain maps displaying the voxelwise ROI regression between relative REM gamma activity over frontal electrodes and the sleep-rested dACC discrimination ability (threatening > not threatening contrast) (peak MNI coordinates: 4, 22, 40 thresholded at FWE p < 0.05 corrected for multiple comparisons). Scatterplot on far right displays this same relationship using the average parameter estimates across the 5 mm dorsal anterior cingulate ROI mask. Equivalent brain maps and regression plots for the anterior insula (C; peak MNI coordinates: left, −36, 18, −10; right, 40, 22, −4) and amygdala (D; peak MNI coordinates: −20, 0, −14) ROIs.