Interactive · DBS Research

The Brain Circuits Targeted
in Treatment-Resistant Depression

Deep brain stimulation modulates specific neural circuits regulating mood, motivation, and emotional processing. Click any node on the brain or select a region below.

THALAMUS THALAMUS HYPO CORONAL VIEW LEFT RIGHT BRAINSTEM LATERAL LATERAL Area 25 / SCC Medial Forebrain Bundle Ventral Striatum

↑ Click any node, or select a region below

01 — Subcallosal Cingulate

Area 25

Emotional regulation hub — chronically hyperactive in treatment-resistant depression

02 — Reward Circuit

Medial Forebrain Bundle

The brain's primary reward highway — severely impaired in anhedonia

03 — Nucleus Accumbens

Ventral Striatum

Reward valuation centre — dysfunctional in motivational collapse

Medial Forebrain Bundle · slMFB Target

Restoring Reward and Motivation.

The Medial Forebrain Bundle (MFB) is a dense white-matter tract carrying dopaminergic projections from the midbrain's ventral tegmental area (VTA) upward to reward-processing regions across the frontal cortex and limbic system. In treatment-resistant depression, impaired signal flow along this pathway is directly linked to severe anhedonia — the inability to experience pleasure, anticipation, or motivation. DBS targeting the superolateral branch of the MFB (slMFB) aims to restore this reward circuit, with studies reporting antidepressant effects within days of stimulation onset.

Clinical Target Info
slMFB
Lateral hypothalamic
trajectory
Bilateral implant
130Hz / ~3ms
Days
Onset of antidepressant effect after stimulation activation
130Hz
Standard stimulation frequency in active MFB DBS protocols
~3ms
Typical pulse width for MFB stimulation parameters
Phase II
Current clinical trial stage for MFB DBS in TRD populations
How This Target Works
↑

Dopamine Pathway Restoration

Stimulation drives dopaminergic projections from VTA to prefrontal cortex and nucleus accumbens, directly restoring the brain's reward signalling.

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Rapid Antidepressant Effect

MFB DBS produces measurable effects within days — a unique speed property among all antidepressant interventions currently available.

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Fully Reversible & Adjustable

Parameters can be tuned after implantation and the device turned off entirely — unlike ablative surgical procedures.

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Bilateral Symmetry Protocol

MFB DBS targets both hemispheres simultaneously to normalise bilateral reward circuit hypoactivity characteristic of TRD.

Area 25
SCC
Medial
Forebrain Bundle
Ventral
Striatum
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Broaden Study is a clinical research and mental health innovation platform. The information provided on this website is for educational and research awareness purposes only and does not constitute medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Deep brain stimulation (DBS) is an investigational or specialized therapy that carries specific risks and safety considerations which should be discussed thoroughly with a clinical professional.