Source-level power and GC were submitted to planned simple contrasts of states (S-RS vs M-RS) to demonstrate the extent of α adaption from S-RS to M-RS. We then performed simple contrasts of group (PTSD vs control) for the two states to test PTSD-related deficits in α power and GC, and double contrasts of state and group to assess the effect of visual stimulation (S-RS minus M-RS) between groups. Pearson correlations were performed to assess clinical associations of α power and GC with symptom severity of hypervigilance. Guided by previous surface-level analyses showing no difference between the two control groups (GAD and HC; Clancy et al., 2017), we combined them into a single control group. Our supplemental analyses confirmed that these two control groups did not differ in source-level α activity.
