Figure 3From: Melatonin facilitates extinction, but not acquisition or expression, of conditional cued fear in ratsMelatonin injected immediately after extinction training has no effect on extinction learning. (A) Schematic of the behavioral procedure used. Behavior procedure involved four training phases: habituation, fear conditioning, extinction training and extinction test. Rats were administrated melatonin immediately after extinction training. (B) Percent freezing to the CSs was shown for the melatonin group (n = 6) and the vehicle group (n = 6) during extinction training. (C) Percent freezing to the CSs during extinction testing. Mel = melatonin group, Veh = vehicle group. All data are represented as mean ± SEM.Back to article page