Abstract
1. 1. The effects of d,l propranolol on stereotyped behavior induced by apomorphine administration was studied quantitatively. 2. 2. d,l Propranolol caused a 2.5 leftward displacement of the control dose-response curve constructed to apomorphine-induced stereotypy; the ED 50 for apomorphine was reduced from 1.87 ± 0.38 to 0.74 ± 0.17. 3. 3. The potentiation was dependent on both d, l-propranolol and apomorphine doses. 4. 4. Results are discussed in the light of a possible interference of the central noradrenergic systems with the expression of dopaminergic-induced stereotyped behavior.
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