Fig. 2.

Mean ± SE FOS-positive cells in the BLA (A) and CeA (B) in pre-adolescent (gray bars) and adult (black bars) male rats exposed to control conditions (Control), fear conditioning training alone (Training) or 1-hr restraint stress followed by training (Stress + Training). There was increased FOS expression in the BLA in the Training and Stress + Training groups. There was a significant interaction between age and condition in the BLA such that this increase was greater in pre-adolescents than in adults (p < 0.05). Asterisk indicates a significant difference between the ages under that condition. Representative photomicrographs of FOS-positive cells in the BLA of pre-adolescents and adults exposed to control conditions (C and F), training alone (D and G) or restraint stress followed by training (E and H). Scale bar=100 µm.