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Related Experiment Videos

Cortical-subcortical re-entrant circuits and recurrent behaviour.

Florence Levy1, Peter R Krebs

  • 1School of Psychiatry, University of New South Wales, and Child and Family East, Prince of Wales Hospital, Sydney, Australia. f.levy@unsw.edu.au

The Australian and New Zealand Journal of Psychiatry
|August 17, 2006
PubMed
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Parallel Distributed Processing (PDP) models applied to brain circuits reveal that psychiatric symptoms arise from dysregulated communication between subcortical and cortical areas. This research offers insights into attention deficit hyperactivity disorder (ADHD) and obsessive-compulsive disorder (OCD).

Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Psychiatry

Background:

  • Cortical-subcortical re-entrant circuits are crucial for cognitive functions.
  • Understanding these circuits is key to explaining recurrent psychiatric symptoms.
  • Parallel Distributed Processing (PDP) models offer a framework for analyzing neural network dynamics.

Purpose of the Study:

  • To apply Parallel Distributed Processing (PDP) models to biological cortical-subcortical re-entrant circuits.
  • To explore the implications of these models for recurrent psychiatric symptomatology.
  • To compare circuit dynamics in attention deficit hyperactivity disorder (ADHD) and obsessive-compulsive disorder (OCD).

Main Methods:

  • Literature review of cortical-cortical and cortical-subcortical re-entrant circuits.

Related Experiment Videos

  • Description of possible neural network (PDP) analogies.
  • Exploration and comparison of ADHD and OCD literature through the lens of PDP models.

    • Main Results:

    • Identified a common circuit architecture across multiple circuits.
    • PDP models indicate subcortical influence on behavior is modulated by higher-level gating processes.
    • Optimal cortical processing occurs around a 'Golden Mean,' degrading with over- or under-arousal; the Continuous Performance Task is useful for imaging attentional networks.

    Conclusions:

    • Recurrent psychiatric symptoms stem from discoordination between subcortical inputs and cortical gating mechanisms.
    • ADHD and OCD represent opposing deficits in cortical-subcortical processing: excess arousal (OCD) vs. insufficient reinforcement/working memory (ADHD).
    • Genetic factors may differentially influence cortical and subcortical levels in these processes.