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. Author manuscript; available in PMC: 2008 Jun 1.
Published in final edited form as: J Psychiatr Res. 2008 Feb 29;42(7):515–520. doi: 10.1016/j.jpsychires.2008.01.017

Figure 2.

Figure 2

Extinction Learning and Extinction Retention Indices (see text for definition) demonstrate intact extinction learning across all groups but impaired extinction retention in PTSD twins only. *p<0.05. ExP+: PTSD twins, UxP+: their combat-unexposed co-twins; ExP-: combat-exposed non-PTSD twins, UxP-: their combat-unexposed co-twins.