Figure 2. Group mean P3b amplitudes to target stimuli at the Pz site in the non-medicated, non-smoking subsample.
ExP+: combat veterans with combat-related PTSD; ExP−: combat veterans without combat-related PTSD; UxP+: non-combat, monozygotic twins of combat veterans with combat-related PTSD; UxP−: non-combat, monozygotic twins of combat veterans without combat-related PTSD. Error bars indicate standard errors.