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Related Experiment Videos

Intra-prefrontal 8-OH-DPAT and M100907 improve visuospatial attention and decrease impulsivity on the five-choice

Catharine A Winstanley1, Yogita Chudasama, Jeffrey W Dalley

  • 1Department of Experimental Psychology, University of Cambridge, UK. caw42@cam.ac.uk

Psychopharmacology
|April 5, 2003
PubMed
Summary
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Modulating serotonin (5-HT) receptors in the medial prefrontal cortex (mPFC) using specific drugs improved cognitive performance in rats. This highlights a potential mechanism for treating neuropsychiatric disorders.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Cognitive Science

Background:

  • Central serotonergic systems are key targets for neuropsychiatric disorder treatments.
  • Disruptions in medial prefrontal cortex (mPFC) function are implicated in disorders like depression and schizophrenia.
  • The precise role of serotonin (5-HT) in mPFC modulation of cognitive function remains unclear.

Purpose of the Study:

  • To investigate the function of serotonin 5-HT(1A) and 5-HT(2A) receptors in the mPFC.
  • To assess the impact of these receptors on performance in the five-choice serial reaction time task (5CSRT).
  • To understand the effects on visuospatial attention, impulsivity, and motivation.

Main Methods:

  • Rats were trained on the 5CSRT task.
  • Rats received intra-mPFC infusions of 8-OH-DPAT (a 5-HT(1A) agonist) or M100907 (a 5-HT(2A) antagonist).

Related Experiment Videos

  • Dose-response effects were evaluated using a Latin square design, with subsequent systemic administration and antagonist blockade (WAY 100635) to confirm receptor specificity.

    • Main Results:

    • Both 8-OH-DPAT and M100907 enhanced accuracy in target detection during the 5CSRT.
    • 8-OH-DPAT improved accuracy with shortened stimulus duration, while M100907 reduced premature responding and omissions.
    • Systemic administration yielded similar effects, and 8-OH-DPAT's effects were blocked by a selective 5-HT(1A) antagonist.

    Conclusions:

    • Modulating 5-HT(1A) and 5-HT(2A) receptors within the mPFC distinctly impacts 5CSRT performance.
    • These findings suggest a mechanism for how serotonergic agents enhance cognitive function.
    • This may be relevant to the therapeutic benefits of these agents in neuropsychiatric disorders.