Cingulate dynamics track depression recovery with deep brain stimulation

Summary & key facts

Researchers tested a new deep brain stimulation (DBS) system in 10 people with treatment-resistant depression. The device both stimulated a brain area called the subcallosal cingulate (SCC) and recorded nearby brain electrical signals over 24 weeks. At the study end, most people improved. The team used signals from six participants and an explainable machine-learning method to create a brain-based biomarker that tracked who was “sick” versus in “stable response,” matched changes in facial expression, and related to preoperative brain wiring. The study is small and experimental, so more research is needed to confirm these results.

Key facts:

• Ten people with treatment-resistant depression received SCC DBS and were followed for 24 weeks with the experimental device that both stimulated and recorded brain signals.
• At 24 weeks, 9 of 10 participants (90%) met the study definition of clinical response (>50% drop in HDRS-17) and 7 of 10 (70%) met remission criteria (HDRS-17 < 8).
• Average depression score (HDRS-17) fell from 22.3 (s.d. 1.64) before surgery to 7.3 (s.d. 3.62) at 24 weeks across the group.
• Long-term local field potentials (LFPs) were available from six participants and were used to train an explainable AI biomarker (a discriminative component) that distinguished ‘sick’ from ‘stable response’ states in each person.
• The biomarker tracked individual recovery paths, was sensitive to therapeutic adjustments, could predict relapses, and was distinct from short-term stimulation effects, according to the authors.
• Differences in how quickly people recovered were linked to measures of preoperative structural damage and functional connectivity in the targeted white-matter network.
• Objective facial-expression changes measured by video analysis matched the biomarker and clinical recovery patterns, providing a behavioral correlate to the brain signal.
• Limitations include the small sample size (10 total, 6 with usable brain recordings), use of an experimental implantable device, and the need for further studies to validate the biomarker in larger and independent groups.

Topics

Functional Brain Connectivity Studies Neurological disorders and treatments Transcranial Magnetic Stimulation Studies

Categories

Health Sciences Medicine Neurology

Tags

Biochemistry Biology Biomarker Brain stimulation Clinical trial Deep brain stimulation Depression (economics) Disease Economics Internal medicine Macroeconomics Magnetic resonance imaging Major depressive disorder Medicine Mood Neuroimaging Neuroscience Parkinson's disease Physical medicine and rehabilitation Psychiatry Psychology Radiology Stimulation Treatment-resistant depression White matter

Conditions & symptoms

Depression Lack of energy or motivation Poor sleep Sadness or low mood