Acquisition and extinction of hiding behavior during the 5 s that follow the warning period in (A) male patients versus male controls (n=15 and 9, respectively), and in (B) female patients versus female controls (n=12 and 17, respectively). On the acquisition phase, when this period was a bomb period, there was a main effect of Trial and Trial x Group interaction (mixed ANOVA, both p<0.050), although post-hoc investigation of the interaction did not show significant effects. On the extinction phase, when this period was the first 5 s of the intertrial period, there were main effects of Group and Sex × Group interaction (both p<0.050), with male patients hiding more than male and female controls and a tending to hide more than female patients. Error bars indicate SEM.