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Related Experiment Videos

Deficits in impulse control associated with tonically-elevated serotonergic function in rat prefrontal cortex.

Jeffrey W Dalley1, David E Theobald, Dawn M Eagle

  • 1Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK. jwd20@cus.cam.ac.uk

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
|May 15, 2002
PubMed
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Impulsive behavior in rats is linked to increased serotonin (5-HT) release in the prefrontal cortex. Dopamine (DA) dysfunction may also contribute to impulsivity, suggesting complex neurochemical underpinnings.

Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Psychopharmacology

Background:

  • Serotonergic system dysfunction is implicated in impulsive behavior.
  • Previous studies relied on indirect measures of serotonin (5-HT) function.
  • The precise role of prefrontal cortex neurochemistry in impulse control requires direct investigation.

Purpose of the Study:

  • To directly measure serotonin (5-HT) and dopamine (DA) release in the rat prefrontal cortex during an attentional task.
  • To investigate the relationship between neurochemical changes and impulsive behavior, specifically premature responses.
  • To explore potential neurochemical markers associated with impulsivity.

Main Methods:

  • In vivo microdialysis was used to measure extracellular levels of 5-HT, 5-HIAA, DA, and DOPAC in the prefrontal cortex of rats.

Related Experiment Videos

  • Rats performed a visual attentional task with a variable inter-trial interval to elicit impulsive responses.
  • Regression analysis and post-mortem tissue analysis were employed to correlate neurochemistry with behavior.

    • Main Results:

    • Elevated 5-HT efflux in the prefrontal cortex positively correlated with the number of premature (impulsive) responses.
    • Dopamine (DA) and its metabolite DOPAC levels increased during task performance, unlike 5-HT.
    • Post-mortem analysis indicated higher DA turnover in impulsive rats, but no detectable 5-HT abnormalities.

    Conclusions:

    • Increased serotonin (5-HT) release in the prefrontal cortex is directly associated with deficits in impulse control during this attentional task.
    • Dopamine (DA) dysfunction in the prefrontal cortex may represent an independent trait marker for impulsivity.
    • These findings highlight the distinct roles of 5-HT and DA in regulating impulsive behavior.