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Related Experiment Video

Updated: Dec 27, 2025

The 5-Choice Serial Reaction Time Task: A Task of Attention and Impulse Control for Rodents
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Increased dopamine availability magnifies nicotine effects on cognitive control: A pilot study.

Stefan Ahrens1, Joana Laux1, Christina Müller1

  • 1Biological Psychology, Department of Psychology, School of Medicine and Health Sciences, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany.

Journal of Psychopharmacology (Oxford, England)
|March 6, 2020
PubMed
Summary

Nicotine impacts cognitive control, improving flexibility but reducing stability. This effect is amplified when dopamine levels are boosted with L-tyrosine, suggesting a complex interaction.

Keywords:
L-tyrosineacetylcholineattentioncognitionpsychopharmacology

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Cognitive control, essential for adapting to new tasks and ignoring distractions, relies on dopaminergic and cholinergic systems.
  • Understanding how neurotransmitters interact is crucial for elucidating cognitive control mechanisms.

Purpose of the Study:

  • To investigate the hypothesis that nicotine's effect on cognitive control is modulated by baseline dopamine levels.
  • To examine the influence of L-tyrosine, a dopamine precursor, on nicotine's impact on cognitive stability and flexibility.

Main Methods:

  • Thirty-eight healthy non-smokers participated in a cognitive control task with distractor and switch trials.
  • Participants received either L-tyrosine or a placebo to manipulate dopamine availability, followed by nicotine or placebo administration.
  • Response time costs in distractor and switch trials were measured to assess cognitive stability and flexibility.

Main Results:

  • Nicotine differentially affected cognitive control, reducing switch trial costs (enhancing flexibility) while increasing distractor trial costs (reducing stability).
  • A trend-wise interaction indicated that L-tyrosine potentiated nicotine's effects on cognitive control.
  • Nicotine's impact on behavior was more pronounced in participants who received L-tyrosine.

Conclusions:

  • Nicotine exhibits opposing effects on cognitive stability and flexibility.
  • Supplementing with L-tyrosine increased susceptibility to nicotine's modulatory effects on cognitive control.
  • These findings suggest a significant interaction between dopamine and acetylcholine in regulating cognitive control processes.