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Related Concept Videos

Drugs Affecting Neurotransmitter Synthesis01:29

Drugs Affecting Neurotransmitter Synthesis

Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
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Related Experiment Video

Updated: Jun 2, 2026

Online Repetitive Transcranial Magnetic Stimulation of Dorsomedial and Dorsolateral Prefrontal Cortex in Cognition Decision Making, and Cognitive Dissonance
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The dopamine agonist bromocriptine differentially affects fronto-striatal functional connectivity during working

Deanna L Wallace1, Jason J Vytlacil, Emi M Nomura

  • 1Helen Wills Neuroscience Institute, University of California at Berkeley Berkeley, CA, USA.

Frontiers in Human Neuroscience
|April 20, 2011
PubMed
Summary

Bromocriptine, a dopamine agonist, impacts working memory differently based on individual capacity. Dopamine augmentation improved low-capacity performance by increasing frontal-striatal connectivity, while high-capacity individuals showed decreased connectivity and performance.

Keywords:
dopaminefMRIfunctional connectivityworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Pharmacology

Background:

  • Dopamine plays a crucial role in cognitive functions, particularly working memory.
  • Individual differences in working memory capacity are substantial and linked to variations in dopaminergic function.
  • Understanding the neural mechanisms underlying these individual differences is essential for targeted cognitive enhancement.

Purpose of the Study:

  • To investigate the effects of bromocriptine, a dopamine agonist, on behavioral performance and frontal-striatal connectivity during a working memory task.
  • To explore how dopaminergic augmentation differentially affects individuals with varying working memory capacities.
  • To elucidate the neural mechanisms underlying the inverted U-shaped dopamine response in working memory.

Main Methods:

  • Participants completed a working memory task.
  • Bromocriptine was administered to augment dopaminergic activity.
  • Functional magnetic resonance imaging (fMRI) was used to measure frontal-striatal connectivity.
  • Behavioral performance metrics were collected and analyzed in conjunction with connectivity data.

Main Results:

  • In individuals with low working memory capacity, bromocriptine increased frontal-striatal connectivity, correlating with improved behavioral performance.
  • In individuals with high working memory capacity, bromocriptine decreased frontal-striatal connectivity, correlating with poorer behavioral performance.
  • These results support an inverted U-shaped relationship between dopamine function and working memory performance.

Conclusions:

  • Dopaminergic augmentation via bromocriptine has differential effects on working memory based on individual capacity.
  • Frontal-striatal connectivity changes mediate the behavioral effects of dopamine in working memory.
  • The findings provide critical insights into the neurobiological basis of individual differences in cognitive function and dopamine's role.