Result of whole brain analysis comparing PTSD to HC groups at baseline. A significant interaction of group x face was found in a single cluster that included the dorsal anterior cingulate (Brodmann’s Area 32) and medial frontal gyrus (BA 9), p=.012, k=258 voxels, max voxel: x=4, y=36, z=30). Threshold was set at p=.05 family-wise error corrected for multiple comparisons at the cluster level.