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Human cognitive flexibility depends on dopamine D2 receptor signaling
Mieke van Holstein1, Esther Aarts, Marieke E van der Schaaf
1Donders Institute for Brain, Cognition and Behaviour (RU/DI-BCB), Radboud University Nijmegen, Kapittelweg 29, 6521 EN Nijmegen, the Netherlands. m.vanholstein@donders.ru.nl
Psychopharmacology
|May 26, 2011
Summary
Dopamine D2 receptor signaling is crucial for human cognitive flexibility. Bromocriptine enhanced flexibility in individuals with low dopamine, an effect blocked by sulpiride, confirming D2 receptor involvement.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Pharmacology
Background:
- Dopamine receptor subtypes differentially affect cognition.
- Theorized role of dopamine D2 receptor signaling in cognitive flexibility.
- Lack of direct human evidence for dopamine D2 receptor involvement in cognitive flexibility.
Purpose of the Study:
- To demonstrate the critical role of dopamine D2 receptor signaling in human cognitive flexibility.
- To investigate the effects of dopamine receptor modulation on cognitive flexibility in humans.
Main Methods:
- Pharmacological pretreatment design using bromocriptine (dopamine agonist) and sulpiride (D2 antagonist).
- Assessment of task-set switching to measure cognitive flexibility.
- Inclusion of DAT1 VNTR polymorphism to account for genetic variations in dopamine levels.
Main Results:
- Bromocriptine improved cognitive flexibility in subjects with low genetically determined dopamine levels.
- The pro-cognitive effects of bromocriptine were abolished by sulpiride pretreatment.
- Demonstrated a specific role for dopamine D2 receptors in mediating these effects.
Conclusions:
- Provides strong evidence for the hypothesis linking human cognitive flexibility to dopamine D2 receptor signaling.
- Highlights the importance of dopamine D2 receptor function for cognitive flexibility.
- Suggests potential therapeutic targets for cognitive enhancement.
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