Brain Circuit Linked to OCD-Like Behaviors Identified

Researchers have identified a brain pathway in mice that may influence the automatic repetitive behaviors seen in OCD.

Updated on Oct. 10, 2026 in Autism

A stainless steel medical instrument and a single droplet of water in a petri dish on a sterile laboratory surface. — Researchers at Stony Brook University have mapped a specific neural pathway connecting the amygdala to the striatum that triggers repetitive behaviors in mice, providing new insights into obsessive-compulsive disorder. AI Illustration. Upload story photo >

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Stony Brook University researchers discovered a specific neuronal connection between the amygdala and the dorsolateral striatum that drives repetitive grooming in mice. This preclinical finding offers a potential new target for understanding obsessive-compulsive disorder.

Why it matters

Identifying these circuits is a critical step in understanding the biological underpinnings of OCD, which affects an estimated 2% to 3% of the population. Mapping these pathways may eventually guide the development of more targeted treatments for those struggling with compulsive behaviors.

In a preclinical study published in Neuron, researchers identified a sparse neuronal connection between the amygdala, which processes anxiety, and the dorsolateral striatum, which governs automatic behavior. Stimulating this circuit in mice significantly increased repetitive grooming.

The players

Stony Brook University

A public research university where the study identifying the mouse brain circuit was conducted.

National Institute of Mental Health

A federal agency that conducts and supports research into mental disorders and the brain.

University of Iowa

A research institution that provided biophysical modeling assistance for the study.

The details

The researchers used functional mapping to reveal how the amygdala and dorsolateral striatum communicate. By stimulating this circuit, they established a link between external stimuli, such as a drop of water on a mouse's nose, and obsessive grooming activity. Inhibiting the amygdala effectively delayed or prevented these compulsive actions, suggesting this pathway is a key driver in how fear and anxiety manifest as automatic physical behaviors.

The research study was published in the journal Neuron in October 2026.

Health Landscape

This study follows a pattern set by the National Institute of Mental Health's Research Domain Criteria project by shifting from symptom-based diagnosis toward identifying the underlying neural circuit mechanisms of psychiatric conditions. It represents a pivot toward circuit-based medicine in neurobiology.

While this discovery helps explain the brain mechanisms behind compulsive behaviors, it is currently limited to animal models. Individuals concerned about repetitive behaviors or OCD symptoms should discuss diagnostic options and evidence-based therapy with their physician.

The takeaway

This research highlights that OCD-like behaviors in mice can be triggered by specific communication between anxiety-processing and action-executing regions of the brain. If you or a loved one are experiencing persistent, disruptive compulsive thoughts or habits, consider consulting a mental health specialist.