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The Journal of Neuroscience, April 1, 1998, 18(7):2720-2728
D1- Versus D2-Receptor Modulation of Visuospatial Working Memory in Humans
Ulrich Müller, D. Yves von Cramon, and Stefan Pollmann Max-Planck-Institute of Cognitive Neuroscience, 04103 Leipzig, Germany
The effects of pergolide, a mixed D1/D2 receptor agonist, and bromocriptine, a selective D2 receptor agonist, were assessed in a visual delay task to further investigate the "dopamine link" of working memory in humans and to look for differential D1 versus D2 receptor contributions. Two groups of 32 healthy young adults (16 female) received either 0.1 mg of pergolide or 2.5 mg of bromocriptine in a placebo-controlled cross-over design. A pretreatment with domperidone, a peripherally active D2 antagonist, was performed in both groups to reduce side effects. Interindividual differences in pharmacokinetics were controlled by the time course of serum prolactin inhibition. The working memory paradigm was a visuospatial delayed matching task; the location of a randomly generated seven-point pattern had to be memorized and compared after 2, 8, or 16 sec with a second pattern that was either identical or slightly shifted within a reference frame. The task was designed with the intention to present unique stimuli at each trial and to require minimal motor demands. Practice effects between the two pharmacological test days were minimized by training sessions that preceded the tests. The paradigm showed significant error and reaction time increases with longer delays. After comparable doses, only pergolide, but not bromocriptine, facilitated visuospatial working memory performance as demonstrated by a significant drug-by-delay interaction. These findings are in accordance with the monkey literature as well as with neuroanatomical findings, and they confirm a preferential role of prefrontal D1 receptors for working memory modulation in humans.
Key words: short-term memory; working memory; prefrontal cortex; dopamine; D1 receptor; D2 receptor; bromocriptine; pergolide; domperidone; prolactin; humans
Copyright © 1998 Society for Neuroscience 0270-6474/98/1872720-09$05.00/0
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