Figure 3.

Place avoidance performance during 18 daily sessions of alternating stable (condition 1) and shuffled (condition 2) arenas. Results are plotted in pairs of days. Black and white columns represent the stable and shuffled arenas, respectively. (A) Mean (± SEM) DISTANCE/ENTRANCE in each session. Rats could forage without shock for a significantly shorter distance on a shuffled arena than on a stable arena. (B) Mean (± SEM) number of ADD-ON SHOCKS was low during testing on the stable arena and high, but slowly declining, on the shuffled arena.