Effects of chronic intraperitoneal administration of L-dopa (12.5 mg/kg), ropinirole (1 mg/kg) or citalopram (10 mg/kg) evaluated in the forced-swim test, (A) the elevated plus-maze and (B) in an operant sucrose self-administration procedure (C). Significant lesion x treatment interactions were found for (A) and (B) (Fs > 2.94, Ps < 0.05) but not for (C) (significant effect of lesion: F1,63 = 16.53, P < 0.001, but no interaction: F3,63 = 0.78, P = 0.51). n = 6–11. *P < 0.05, **P < 0.01, ***P < 0.001, Sham-operated vs. Lesioned.