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Stress modulation of visuomotor binding.

Lorenza S Colzato1, Wouter Kool, Bernhard Hommel

  • 1Leiden University, Institute for Psychological Research & Leiden Institute for Brain and Cognition, Leiden, The Netherlands. colzato@fsw.leidenuniv.nl

Neuropsychologia
|February 26, 2008
PubMed
Summary

Stress impacts visuomotor binding by altering dopamine levels in the prefrontal cortex. Optimal visuomotor performance and binding are linked to average dopamine levels, following an inverted U-shaped curve.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurochemistry

Background:

  • The primate cortex integrates perceived and produced events via distributed representations.
  • Muscarinic-cholinergic pathways control local visual feature binding, while dopaminergic pathways drive visuomotor binding.

Purpose of the Study:

  • To investigate the modulatory effect of stress on the binding of visual features and actions.
  • To explore the role of dopamine in stress-induced changes in visuomotor binding and working memory.

Main Methods:

  • Inducing stress using the cold pressure test (CPT) to increase dopamine turnover in the prefrontal cortex.
  • Assessing the impact of stress on task-relevant visuomotor binding.
  • Analyzing the relationship between dopamine levels, visuomotor performance, and the personality trait of extraversion.

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Main Results:

  • Stress, via excessive dopamine turnover, selectively impacts task-relevant visuomotor binding.
  • Dopamine appears crucial for maintaining task-relevant information in working memory.
  • Visuomotor performance and binding exhibit an inverted U-shaped relationship with dopamine levels, peaking at average levels.

Conclusions:

  • Stress modulates visuomotor binding through dopaminergic pathways in the prefrontal cortex.
  • Average dopamine levels are associated with the strongest visuomotor binding, suggesting an optimal range for cognitive function.