Next, simple contrasts of group (PTSD vs controls) revealed α power deficits in PTSD across the visual and DMN ROIs at each state. The VC exhibited the strongest group effects: at S-RS, a large cluster (283 voxels) spanning bilateral cuneus (peaks: 5, −70, 30/−5, −70, 30; ts < −3.41, ds > 0.83), bilateral precuneus (peaks: 5, −60, 35/−5, −65, 25; ts < −3.75, ds > 0.92), and the right superior occipital gyrus (peak: 40, −80, 25; t = −3.90, ds > 0.96; Fig. 1A); at M-RS, a cluster (68 voxels) in the bilateral precuneus, overlapping the S-RS cluster (peaks: 5, −55, 50/−5, −55, 40; ts < −3.11, ds > 0.76; Fig. 1B). Regarding the DMN, α deficits emerged in PTSD in the bilateral PCC for both states (S-RS: 60 voxels; peaks: 15, −45, 40/−5, −50, 35; ts < −3.32, ds > 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.
