Figure 2.

a, Fear conditioning does not affect sampling of the context. Representative examples of trajectories from two fear-conditioned (top panel) and two control (bottom panel) animals recorded in the training context before and after coyote odor exposure. Both animals sample all regions of the environment, which is essential for place cell recordings. The 24 h session is shown because the conditioned freezing response peaks at this time point. b, Example of clusters and waveforms showing long-term recording stability. The two cells shown were recorded for 5 d (120 h) exhibiting minimal or no drift. Features used for cluster cutting included energy (i.e., sum of squared amplitude), peak amplitude, and time.