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Journal of Psychopharmacology
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The modulatory effects of dopamine D1 and D2 receptor function on object working memory in humans

Cali F. Bartholomeusz

Georgia Box

Cindy Van Rooy

Neuropsychopharmacology Research Unit, Brain Sciences Institute, Swinburne University of Technology, Australia

Pradeep J. Nathan

Neuropsychopharmacology Research Unit, Brain Sciences Institute, Swinburne University of Technology, Australia; pnathan{at}bsi.swin.edu.au

The role of dopamine D1 and D2 receptors in modulating object working memory in humans is poorly understood. The current study was designed to investigate the effects of D1 and D2 receptor modulation on object working memory. Twelve healthy subjects underwent testing under three conditions [0.05 mg pergolide (D1/D2 receptor agonist), 2.5 mg bromocriptine (D2 receptor agonist) and placebo] in a double-blind, placebo-controlled repeated measures design. Subjects performed the object working memory N-back task pre-drug and 1.5 h and 3 h post-drug administration. Neither pergolide nor bromocriptine had an effect on object working memory performance. These findings suggest that object working memory may not be modulated by D1 and D2 receptors in humans.

Key Words: dopamine • dopamine receptors • object N-back • object working memory • working memory

Journal of Psychopharmacology, Vol. 17, No. 1, 9-15 (2003)
DOI: 10.1177/0269881103017001688
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