A thalamocorticostriatal dopamine network for psychostimulant-enhanced human cognitive flexibility

Gregory R. Samanez-Larkin, Joshua W. Buckholtz, Ronald L. Cowan, Neil D. Woodward, Rui Li, M. Sib Ansari, Catherine M. Arrington, Ronald M. Baldwin, Clarence E. Smith, Michael T. Treadway, Robert M. Kessler, David H. Zald

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Background: Everyday life demands continuous flexibility in thought and behavior. We examined whether individual differences in dopamine function are related to variability in the effects of amphetamine on one aspect of flexibility: task switching. Methods: Forty healthy human participants performed a task-switching paradigm following placebo and oral amphetamine administration. [18F]fallypride was used to measure D2/D3 baseline receptor availability and amphetamine-stimulated dopamine release. Results: The majority of the participants showed amphetamine-induced benefits through reductions in switch costs. However, such benefits were variable. Individuals with higher baseline thalamic and cortical receptor availability and striatal dopamine release showed greater reductions in switch costs following amphetamine than individuals with lower levels. The relationship between dopamine receptors and stimulant-enhanced flexibility was partially mediated by striatal dopamine release. Conclusions: These data indicate that the impact of the psychostimulant on cognitive flexibility is influenced by the status of dopamine within a thalamocorticostriatal network. Beyond demonstrating a link between this dopaminergic network and the enhancement in task switching, these neural measures accounted for unique variance in predicting the psychostimulant-induced cognitive enhancement. These results suggest that there may be measurable aspects of variability in the dopamine system that predispose certain individuals to benefit from and hence use psychostimulants for cognitive enhancement.

Original languageEnglish (US)
Pages (from-to)99-105
Number of pages7
JournalBiological Psychiatry
Volume74
Issue number2
DOIs
StatePublished - Jul 15 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biological Psychiatry

Keywords

  • Amphetamine
  • PET
  • cognitive control
  • dopamine
  • flexibility
  • parietal cortex
  • prefrontal cortex
  • striatum
  • thalamus

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