d-Amphetamine and punished responding: The role of catecholamines and anorexia |
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Authors: | S Lazareno |
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Institution: | (1) Department of Psychology, University of Reading, Whiteknights, Reading, UK |
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Abstract: | Rats were trained to press a lever for food on a schedule in which components of variable interval reinforcement (VI2 ) alternated with conflict components in which every response resulted in food delivery and footshock. Low doses of d-amphetamine selectively suppressed responding in the confliet component in a dose-dependent manner, whereas prefeeding suppressed responding in both components. Pretreatment with noradrenergic blocking agents (propranolol, phentolamine and phenoxybenzamine) did not diminish the suppressant effect of d-amphetamine, but this effect was reduced by pretreatment with alpha-methyl-para-tyrosine methylester and dopamine blockers (spiroperidol, haloperidol and clozapine) indicating that d-amphetamine was exerting its selective suppressant effect via the release of dopamine. It is suggested that the effects of low doses d-amphetamine on behaviour in conflict situations may provide a useful model for investigating the mode of action of neuroleptic drugs. |
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Keywords: | D-Amphetamine" target="_blank">D-Amphetamine Punishment Response suppression Prefeeding Alpha-methyl-p-tyrosine Phentolamine Phenoxybenzamine Propranolol Spiroperidol Haloperidol Clozapine Anorexia Schizophrenia Dopamine Rats |
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