Table 2.

Bayesian model selection [Color table can be viewed at http://wileyonlinelibrary.com]

Group	Nodes 1 and 2	Exceedance probability
		Model 1	Model 2	Model 3
PTSD	Left BLA‐PAG	0.0001	0.1117	0.9
	Right BLA‐PAG	0	0.0375	0.9625
	Left CMA‐PAG	0.0002	0.87	0.1382
	Right CMA‐PAG	0	0.8	0.2029
	Left BLA‐vmPFC	0.0045	0.0197	0.9758
	Right BLA‐vmPFC	0.0002	0.2088	0.80
	Left CMA‐vmPFC	0.0035	0.4054	0.62
	Right CMA‐vmPFC	0	0.9263	0.0737
	PAG‐vmPFC	0.004	0.1853	0.82
PTSD+DS	Left BLA‐ PAG	0	0.0659	0.9341
	Right BLA‐PAG	0.0008	0.08	0.92
	Left CMA‐PAG	0	0.0391	0.9609
	Right CMA‐PAG	0.0043	0.159	0.85
	Left BLA‐vmPFC	0	0.80	0.208
	Right BLA‐vmPFC	0	0.9622	0.0378
	Left CMA‐vmPFC	0	0.65	0.3757
	Right CMA‐vmPFC	0.0001	0.9991	0.0008
	PAG‐vmPFC	0.0001	0.9894	0.0105
Healthy controls	Left BLA‐PAG	0.0001	0.6914	0.3085
	Right BLA‐PAG	0.0026	0.3769	0.6205
	Left CMA‐PAG	0.0034	0.9882	0.0084
	Right CMA‐PAG	0.0733	0.8095	0.1172
	Left BLA‐vmPFC	0.0001	0.0924	0.9075
	Right BLA‐vmPFC	0.0025	0.1796	0.8179
	Left CMA‐vmPFC	0.0495	0.7607	0.1898
	Right CMA‐vmPFC	0.009	0.099	0.892
	PAG‐vmPFC	0.0089	0.1024	0.8887

Model 1 refers to bi‐directional connectivity between nodes, Model 2 refers to connectivity from node 2 to node 1, and Model 3 refers to connectivity from node 1 to node 2. Exceedance probabilities in bold indicate superior models (>0.80). Abbreviations: PTSD = posttraumatic stress disorder, PTSD + DS = dissociative subtype posttraumatic stress disorder patients, CMA = centromedial amygdala, BLA = basolateral amygdala, PAG = periaqueductal gray.