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Effects of D1 receptor antagonist on licking behavior. (A) SCH23390 (0.2 mg/kg, i.p.) reduced the total number of trials with licking behavior (*P < 0.05). (B,C) Rats were overtrained to lick the spout in response to sound presentation for 2 d before the sound sequence discrimination test. In the overtrained rats, SCH23390 had no significant effect on licking behavior (B) or on sound sequence discrimination (C).
