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Bilateral intra-accumbens self-administration ofd-amphetamine: Antagonism with intra-accumbens SCH-23390 and sulpiride


The efficacy ofd-amphetamine to support a selective bilateral intra-accumbens self-administration response was examined. Bilateral intra-accumbens infusions ofd-amphetamine were made contingent upon the acquisition of a lever-pressing response. Two identical levers were available within the operant chamber. Depression of the drug lever resulted in the intra-accumbens delivery of 1 µgd-amphetamine; responses upon the second, control lever were recorded but had no programmed consequences. Animals were not ‘primed’ with non-contingent infusions ofd-amphetamine at any time during these experiments. Nonetheless, animals readily acquired a selective response upon the drug lever. Removal of thed-amphetamine moiety from the infusate resulted in a large decline in responding, and the abolition of the selectivity of the response for the drug lever. Adulteration of the infusate with either the D1 dopamine receptor antagonist SCH-23390 or the D2 dopamine receptor antagonist sulpiride enhanced the rate of response selectively upon the drug lever. Reductions in the dose ofd-amphetamine also increased the rate of response. The effect of co-adulteration of the infusate with both SCH-23390 and sulpiride together was purely additive. The implications of these data for the methodology of intracranial drug self-administration, and the relationship between D1 and D2 dopamine receptors within the nucleus accumbens are discussed.

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Correspondence to Gavin D. Phillips.

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Phillips, G.D., Robbins, T.W. & Everitt, B.J. Bilateral intra-accumbens self-administration ofd-amphetamine: Antagonism with intra-accumbens SCH-23390 and sulpiride. Psychopharmacology 114, 477–485 (1994). https://doi.org/10.1007/BF02249339

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Key words

  • Intracranial self-administration
  • d-Amphetamine
  • Dopamine
  • Nucleus accumbens
  • SCH-23390
  • Sulpiride