Figure 2.

(A) Serotonin and 5-HIAA concentrations. Mean ± SEM, p < 0.05. (B) Distances traveled by the two groups of animals, through the training days. Mean ± SEM. ^*Day 1 vs. subsequent days, p < 0.001. (C) Distance traveled in each quadrant during the probe test of the two groups of rats. The escape platform was placed in the north quadrant during the training. North (N), South (S), East (E), and West (W) quadrants. Mean ± SEM. ^*N quadrant vs. all other quadrants; +, group CTR vs. EXP, p < 0.05. (D) Swimming velocities displayed by the two groups of animals through the training days. Mean ± SEM.