Table 5.

A between-group, between-time point comparison of activity associated with involuntary memory retrieval. The regions are shown in Fig. 2. There is similar activity between the early time point in the control group and the late time point in the PTSD group in all regions. There is also similar activity between the late time point in the control group and the early time point in the PTSD group in all regions. This suggests that a similar neural network underlies involuntary memory retrieval in PTSD and controls with the difference being the time that it peaks.

	Control early, PTSD late		Control late, PTSD early
	t-Score	p	t-Score	p
All regions	0.31	>0.75	−0.05	>0.95
Left MTL	0.48	>0.60	−1.07	>0.25
Right MTL	1.07	>0.25	−1.17	>0.20
Precuneus	0.69	>0.45	−0.11	>0.90
Left IPC	−0.10	>0.90	0.56	>0.55
Right IPC	−0.51	>0.60	−0.70	>0.45
PCC	0.76	>0.45	0.36	>0.70

All df = 40 except in the comparison between control early and PTSD late, the df = 39.89.