> 0.81; M-RS: 199 voxels; peaks: 5, −30, 25/−5, −30, 25; ts < −3.76, ds > 0.92; Fig. 1A,B), and the bilateral mPFC at M-RS only (88 voxels; peaks: 15, 60, −10/−15, 65, −15; ts < −3.10, ds 0.76; Fig. 1B). Additional α power deficits (whole-brain corrected) appeared in the bilateral insula [S-RS: right/left: 49/76 voxels; peaks: 35, −5, 20/−35, 20, 5 (Fig. 1A); M-RS: right/left: 136/25 voxels; peaks: 40, −5, 15/−30, 25, 5 (Fig. 1B); ts < −3.52, ds = 0.86]. No significant clusters emerged for enhanced α power in the PTSD group, even at a lenient threshold of p < 0.05. Finally, double contrasts of state (M-RS minus S-RS) and group (PTSD minus control) yielded no difference between groups (voxel-level ps > 0.11). These group effects are summarized in Table 2.
