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Obsessive-compulsive disorder: beyond segregated cortico-striatal pathways.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Clinical Psychology

Background:

  • Obsessive-compulsive disorder (OCD) affects 2-3% of the population.
  • Characterized by obsessions (intrusive thoughts) and compulsions (repetitive behaviors).
  • Classic models focus on cortico-striatal circuitry dysfunction.

Purpose of the Study:

  • To review proposed features of OCD pathophysiology.
  • To explore evidence beyond classic cortico-striatal pathways.
  • To argue for impaired fear extinction and behavioral inhibition in OCD.

Main Methods:

  • Review of neuroimaging evidence.
  • Analysis of cortico-striatal and extended brain circuitry involvement.
  • Elaboration of proposed pathophysiological features.

Main Results:

  • Recent neuroimaging implicates lateral/medial orbitofrontal cortices, dorsal anterior cingulate cortex, and amygdalo-cortical circuitry.
  • Evidence suggests dysfunction extends beyond classic cortico-striatal pathways.
  • Impaired fear extinction and behavioral inhibition are proposed as core deficits.

Conclusions:

  • OCD pathophysiology involves a broader network than previously thought.
  • Fear extinction deficits are a significant component of OCD.
  • Understanding these extended circuits may offer new therapeutic targets.