Figure 4.

Behavioral results for Experiment 1. A, Percentage freezing in the unsignaled FC task during training and context extinction. There were no group differences in post-shock freezing or freezing during context extinction. B, Exploration for the test phase of the 3D cxtSOR task. Both objects were familiar, but one was presented in an incongruent context (N) and the other in a congruent context (F). Shown are the discrimination ratio [left, DR = (N − F)/(N + F)], number of exploratory bouts (middle), and duration of exploratory bouts (right). The sham and ipsilateral groups showed discrimination, but the contralateral group did not. All groups showed a greater number of exploration bouts for the novel object in context. Sham and contralateral groups differed in exploratory bout duration such that only the sham group showed the expected increased bout duration for the novel object in context. C, Exploration during the test phase of the standard SOR task. At test, one object is novel and the other is familiar. Panel order is identical to that in B. As expected, all three groups exhibited a positive discrimination value and a greater number of exploratory bouts for the novel object. The sham group did not show the expected increased bout duration for the novel object. D, Percentage freezing in the ABBA renewal FC task during training, tone extinction, and context extinction. Black circles with a white letter denote context, which was defined using visual, olfactory, auditory, extramaze, and tactile cues. Data are means ± SEM. In A–C, sample sizes were n = 6/group and, in D, sample sizes were n = 5/group. For B and C, t test differences from zero were as follows: #p < 0.05, ###p < 0.001; rANOVA: *p < 0.05, ***p < 0.001. D1–D4, Days 1–4, respectively.