Fig. 5.

Experiment 2. Further increase in the level of context fear relative to tone fear. Rats were trained only in one training context with one tone, and then given DH lesions 1 d later. A, Recent contextual fear. DH-lesioned animals exhibited a severe deficit in context freezing (% time ± SEM, for each minute of the 8 min test), although fear levels in sham animals were nearly asymptotic. B, Recent tone fear. DH-lesioned animals did not exhibit deficits in tone freezing, even as tone fear extinguished across the test period and became weaker.C, Interaction. Same data as A andB, averaged for the first 6 min of the context test and 6 min that the tone was on test (6 min was used to make the levels more comparable). DH-lesioned animals exhibited a deficit only in contextual freezing, although tone fear was substantially weaker than context fear in Sham animals.