Pharmacological characteristics of dopamine receptors involved in the dual effect of dopamine agonists on yawning behaviour in rats

Increasing doses of apomorphine (APO) induced the dose-dependent appearance of yawns in rats at doses up to 0.1 mg · kg − and their disappearance from 0.1 to 0.6 mg · kg −. A similar biphasic effect on yawning was observed with increasing doses of n-propyl norapomorphine, piribedil, S 584, bromocrip...

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