Figure 1.

A, Schematic representation of behavioral paradigm. B, In extinction animals, freezing returns to baseline levels 24 h after extinction (postext). Animals exposed only to the context (water control) following the same schedule as the extinction animals do not display significant changes in freezing throughout training. Animals fear conditioned in the training context but exposed to a new context during extinction (ABA control) display fear in the training context when tested 24 h after extinction (extinction: n = 17, water control: n = 12, ABA control: n = 7). Bars represent means ± SEM, *p < 0.05.