The Neuroscience of Being Human
The Neuroscience of OCD
Cortico-striato-thalamo-cortical loops, serotonin dysregulation, error signalling that will not switch off and the neurological overlap with Tourette syndrome, why the OCD brain gets stuck in a loop it knows is irrational but cannot stop
1,283-word article with 8 Harvard references.
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Obsessive-compulsive disorder is not about being tidy. It is not a personality quirk or a preference for order. It is a neurological condition in which the brain's error-detection system becomes locked in a self-reinforcing loop that the conscious mind recognises as irrational but cannot override. The cortico-striato-thalamo-cortical (CSTC) circuit, connecting the orbitofrontal cortex, the caudate nucleus, the globus pallidus, the thalamus, and back to the cortex, becomes hyperactive, generating a persistent signal that something is wrong even when nothing is wrong. The serotonin system, which normally modulates the intensity of these signals, fails to dampen them adequately. The result is a brain that cannot stop checking, cannot stop worrying, cannot stop performing rituals designed to neutralise a threat that the rational mind knows does not exist. This article examines the neuroscience of OCD: what drives it, why it resists willpower, and how modern neuroscience is transforming treatment.
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