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Old mice show less context discrimination than young mice (Experiment 4). Mean ± SEM percentage freezing averaged across the 3-min preshock period in the shock (open/filled symbols) and safe (gray symbols) contexts on each of the nine training days. Whereas all mice conditioned to the shock context at the same rate and to the same extent, this fear was generalized more to the safe context among old animals (B,D) than young animals (A,C).
