Abstract
Rats at 80% body weight were trained to discriminate 1.0 mg/kg d-amphetamine versus saline in a two-lever, discrete trial drug discrimination task to obtain food pellets. After reliable discriminative control of lever choice was established, various doses of d,l-phenylpropanolamine (PPA, i.e., d,l-norephedrine) were substituted for the amphetamine training dose in non-reinforced test trials. Test doses of 10, 20, and 40 mg/kg PPA resulted in over 90% responses on the amphetamine-appropriate lever. Lower doses (1.25, 2.5, and 5.0 mg/kg) resulted in predominantly saline-appropriate responses. The generalization seen after the 20 mg/kg dose of phenylpropanolamine was blocked by pretreatment with 0.5 mg/kg haloperidol, suggesting that the generalization from amphetamine to PPA was mediated by a dopaminergic mechanism.
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