Freezing behavior expressed as percentage of time spent freezing during 5 minutes in the contexts used in the experiment; preshock, the conditioning chamber (A), the novel chamber (B) and re-exposure to the conditioning chamber (A2).

<p>Dunnett’s two-sided post-hoc test was used to compare each test group with the non-stimulated sham group as a controlThe columns and error-bars represent mean ± SEM, * <i>P</i><0.05, ** <i>P</i><0.01, *** <i>P</i><0.001.