Mount Sinai Study Identifies Three Brain Pathways Crucial for Deep Brain Stimulation in Depression

Research shows that precise electrode placement targeting specific white matter connections may improve treatment outcomes for treatment-resistant depression.

By LineZotpaper

Published19 October 2026

Read Time2 min

A study published October 1 in the American Journal of Psychiatry by researchers at Mount Sinai has identified three white matter pathways in the brain that are consistently associated with lasting improvement in patients receiving deep brain stimulation (DBS) for severe, treatment-resistant depression. The findings highlight that the precise targeting of these connections through electrode placement could be critical for successful treatment, with millimeters in positioning potentially determining outcomes.

Researchers at Mount Sinai examined data from multiple clinical studies, including the BROADEN trial and a cohort at the University of Toronto, to understand why deep brain stimulation for depression yields varying results. Using computer models of electrical fields and maps of brain connectivity, they discovered that sustained improvement was consistently linked to stimulation reaching three specific white matter pathways: the cingulum bundle, forceps minor, and the medial uncinate fasciculus/ventral amygdalofugal pathway.

A particularly notable finding was that patients who did not respond to treatment after two years showed a lack of stimulation engagement with the left cingulum bundle. This suggests that electrodes positioned in the correct general region may still fail to activate all necessary connections, offering a potential explanation for why similar electrode placements can produce different outcomes.

The study is part of an ongoing effort to refine DBS through connectome-based targeting, which uses maps of brain connectivity rather than relying solely on anatomical landmarks. This approach has already been incorporated into the ongoing Abbott TRANSCEND clinical trial, a randomized, controlled study using individualized brain connectivity maps.

Dr. Helen Mayberg, Mount Sinai Professor in Neurotherapeutics, emphasized the importance of individualized surgical targeting. "In any randomized controlled trial of a neuromodulation treatment, precise lead placement and confirmation that the intended brain target has been engaged are essential first steps," she said. Dr. Brian Kopell, Director of the Center for Neuromodulation at Mount Sinai, added, "For a network disorder such as depression, millimeters can determine whether stimulation reaches the pathways we intend to modulate."

The analysis relied on generalized maps of brain connectivity for most participants, though results were consistent where individual diffusion imaging was available. The researchers caution that more work is needed to determine which patients are most likely to benefit and how stimulation should be adjusted over time.

Analysis

Why This Matters

Deep brain stimulation is an experimental treatment for severe depression where standard therapies have failed. Identifying the key brain pathways makes DBS more precise, potentially improving outcomes for patients who have few other options.
The finding that differences of millimeters in electrode placement can affect lasting improvement highlights the need for careful surgical planning and imaging-based guidance.
This research moves towards more personalized treatment, where individuals could be matched to the right brain target for their condition.

Background

Deep brain stimulation involves surgically implanting electrodes in the brain to deliver controlled electrical signals to circuits involved in depression. It has been studied for years, but with varying success due to challenges in positioning electrodes. Previous research from Mount Sinai and Emory University established the importance of brain networks in subcallosal cingulate (SCC) DBS, leading to the development of connectome-based targeting methods.

Key Perspectives

Researchers: The study provides evidence for connectome-based targeting, using brain connectivity maps to guide electrode placement, and emphasizes that reaching specific pathways is crucial for lasting improvement. Patients: For those living with treatment-resistant depression, this research offers hope for more effective and reliable treatment in the future, though the approach remains experimental. Clinical community: The findings underscore the importance of precise surgical targeting, potentially influencing the design of future trials and clinical practice for neuromodulation therapies.

What to Watch

The ongoing Abbott TRANSCEND clinical trial, which uses individualized brain connectivity maps to guide SCC DBS treatment.
Future studies exploring patient-specific imaging to determine whether it improves targeting beyond generalized maps.
Whether these findings lead to changes in electrode placement protocols or new guidelines for DBS in depression.

Sources

Scientists uncover 3 key brain pathways linked to lasting depression relief · Latest Science News -- ScienceDaily

Checked

11 claims in this story checked against 1 source: 11 supported.

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SupportedMount Sinai Study Identifies Three Brain Pathways Crucial for Deep Brain Stimulation in DepressionLatest Science News -- ScienceDaily: “Scientists at Mount Sinai have identified three important brain connections associated with long-term improvement in patients receiving deep brain stimulation for severe depression”
SupportedResearch shows that precise electrode placement targeting specific white matter connections may improve treatment outcomes for treatment-resistant depression.Latest Science News -- ScienceDaily: “millimeters in electrode placement could make a major difference in treatment outcomes”
SupportedA study published October 1 in the American Journal of PsychiatryLatest Science News -- ScienceDaily: “Published October 1 in the American Journal of Psychiatry”
Supportedthree white matter pathways: the cingulum bundle, forceps minor, and the medial uncinate fasciculus/ventral amygdalofugal pathwayLatest Science News -- ScienceDaily: “the cingulum bundle, forceps minor, and medial uncinate fasciculus/ventral amygdalofugal pathways”
Supportedpatients who did not respond to treatment after two years showed a lack of stimulation engagement with the left cingulum bundleLatest Science News -- ScienceDaily: “patients who had not responded to treatment after two years showed a lack of stimulation engagement with the left cingulum bundle”
SupportedResearchers at Mount Sinai examined data from multiple clinical studies, including the BROADEN trial and a cohort at the University of TorontoLatest Science News -- ScienceDaily: “the researchers examined information from several clinical studies, including the BROADEN trial and a patient cohort at the University of Toronto”
SupportedThis approach has already been incorporated into the ongoing Abbott TRANSCEND clinical trial, a randomized, controlled study using individualized brain connectivity maps.Latest Science News -- ScienceDaily: “this strategy has already helped shape the ongoing Abbott TRANSCEND clinical trial, a randomized, controlled study that uses individualized brain connectivity maps”
SupportedDr. Helen Mayberg... said, "In any randomized controlled trial of a neuromodulation treatment, precise lead placement and confirmation that the intended brain target has been engaged are essential first steps."Latest Science News -- ScienceDaily: “In any randomized controlled trial of a neuromodulation treatment, precise lead placement and confirmation that the intended brain target has been engaged are essential first steps.”
SupportedDr. Brian Kopell... added, "For a network disorder such as depression, millimeters can determine whether stimulation reaches the pathways we intend to modulate."Latest Science News -- ScienceDaily: “For a network disorder such as depression, millimeters can determine whether stimulation reaches the pathways we intend to modulate.”
SupportedThe analysis relied on generalized maps of brain connectivity for most participants, though results were consistent where individual diffusion imaging was available.Latest Science News -- ScienceDaily: “much of the analysis used generalized maps of brain connectivity... For the Emory patient group... Both approaches produced consistent findings”
SupportedThe researchers caution that more work is needed to determine which patients are most likely to benefit and how stimulation should be adjusted over time.Latest Science News -- ScienceDaily: “Additional studies are needed to determine which individuals are most likely to benefit... and how electrical stimulation should be adjusted as treatment continues”