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Behavior and the basal ganglia

J A Saint-Cyr1, A E Taylor, K Nicholson

  • 1Department of Psychology, Toronto Hospital, Ontario, Canada.

Advances in Neurology
|January 1, 1995
PubMed
Summary

Basal ganglia-thalamo-cortical circuits modulate behavior. Disorders like Parkinson's disease (PD) and obsessive-compulsive disorder (OCD) impair behavioral set formation and maintenance due to dysfunction in these circuits.

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Area of Science:

  • Neuroscience
  • Behavioral Neurology

Background:

  • Basal ganglia-thalamo-cortical circuits are crucial for modulating diverse behaviors, including motor, mental, and emotional sets.
  • Disruptions in these circuits, influenced by lesion site and neurochemistry, can lead to various behavioral deficits.

Purpose of the Study:

  • To explore the role of basal ganglia dysfunction in conditions like Parkinson's disease (PD) and obsessive-compulsive disorder (OCD).
  • To investigate the impact of basal ganglia lesions on the development and maintenance of behavioral sets.

Main Methods:

  • Analysis of basal ganglia-thalamo-cortical circuit function in relation to behavioral modulation.
  • Review of neuropsychological findings in patients with PD and OCD, including problem-solving and cognitive tasks.

Main Results:

  • Basal ganglia diseases affect planning and execution of behaviors, with effects varying by lesion site and neurochemical factors.
  • Both PD and OCD patients exhibit difficulties in habit formation, requiring more practice or external guidance.
  • OCD patients show compartmentalized dysfunction, including ritualistic behaviors and heuristic inefficiency, while PD patients exhibit correlated motor and non-motor deficits.

Conclusions:

  • Disorders of the basal ganglia, including PD and OCD, impair the establishment of heuristics for adaptive behavior.
  • Both PD and OCD demonstrate a common deficit in habit formation and procedural mobilization, suggesting domain-specific basal ganglia dysfunction.

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