Figure 1.

Top, Schematic representation of injection cannula tip placements in the dorsal hippocampus for all rats included in experiment 1. The values to the right of each coronal section indicate the position of each section relative to bregma. Coronal brain images are adapted from the atlas of Paxinos and Watson (1997). Bottom, Muscimol infused into the dorsal hippocampus 1 hr before context pre-exposure significantly reduced freezing resulting from immediate shock. Error bars indicate mean ± SEM percentage of freezing during the context fear test.