The Science Behind OCD: Brain Function and Neurotransmitters

OCD
Written By Nycole Cox

How OCD Affects the Brain

Research shows OCD involves abnormal activity in brain circuits related to:

  • Decision-making

  • Error detection

  • Emotional regulation

The cortico-striato-thalamo-cortical (CSTC) circuit plays a key role in repetitive thoughts and behaviors.

Neurotransmitters and OCD

1. Serotonin

  • Low or dysregulated serotonin levels are linked to OCD

  • Affects mood, anxiety, and repetitive behaviors

2. Dopamine

  • Influences reward and motivation

  • Imbalances may contribute to compulsive actions

Genetic and Environmental Factors

  • Genetics: OCD often runs in families

  • Environment: Trauma, infections, or stress can trigger symptoms

  • Brain Structure Differences: Changes in gray matter or connectivity in OCD-related circuits

Final Thoughts

OCD is rooted in neurological and chemical differences, not weakness or poor habits. Understanding the science reduces stigma and supports effective treatment.

Nycole Cox
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