Figure 1.

Impaired retention of extinction in rats that received intra-IL microinjections of baclofen/muscimol (BM) on days 1–5 of extinction. (A) Active lever presses on days 1–12 of extinction training in which rats received BM into the IL immediately after 30-min extinction sessions on days 1–5. Days 1–5 were 30 min in length, and days 6–12 were 2 h in length. The faded symbols on day 6 indicate the first 30 min of that session. (+) P < 0.05 for overall group difference for days 6–12. (B) Active lever presses on days 1–12 of extinction training in which rats received BM microinjections into the PL on days 1–5 (30-min session length). There were no significant effects of time, group, or the interaction on days 1–5 or days 6–12. (C) Active lever presses on days 1–12 of extinction training in which rats received intra-IL BM microinjections 3 h after the training session on days 1–5 (30-min session length). There were no significant effects of time, group, or the interaction on days 1–5 or days 6–12.