Huberman LabDr. Casey Halpern on Huberman Lab: How DBS calms compulsions
Targeted nucleus accumbens stimulation interrupts compulsion loops; capsulotomy and DBS each help only about half of refractory OCD patients.
CHAPTERS
- 0:00 – 1:10
Meet Dr. Casey Halpern & what neurosurgeons actually do
Huberman introduces Dr. Casey Halpern and uses the opening to clarify what neurosurgery covers compared to neurology and psychiatry. Halpern outlines the broad clinical scope of neurosurgery and how subspecialization shapes his own work.
- •Neurosurgery spans tumors, aneurysms, TBI, spine surgery, and peripheral nerve disorders
- •Modern neurosurgery is highly subspecialized; Halpern focuses on functional neurosurgery
- •Framework: interacting with the brain to deliver therapeutic benefit
- 1:10 – 2:41
Deep Brain Stimulation (DBS) and focused ultrasound: how these brain interventions work
Halpern explains DBS as implanted hardware that delivers electricity to precise brain targets, analogous to delivering a medication. He also describes transcranial MRI-guided focused ultrasound as a non-invasive, FDA-approved ablation option for tremor.
- •DBS = thin insulated lead with multiple contacts delivering stimulation to a small brain region
- •Electrical stimulation can cause brief side effects that are reversible by shutting off stimulation
- •Focused ultrasound can create non-invasive brain lesions (currently approved for tremor)
- •Functional neurosurgery aims for precision modulation of circuits rather than broad effects
- 2:41 – 4:19
Unexpected psychiatric effects from stimulating motor circuits
The discussion highlights that DBS aimed at movement symptoms can also influence mood and compulsive behaviors because targets sit near limbic/emotional circuitry. These observations helped motivate broader psychiatric applications of circuit modulation.
- •Stimulation near motor targets can affect emotion (e.g., laughter, panic)
- •Some Parkinson’s patients report improvements in mood, gambling, or compulsivity
- •Clinical side effects can become clues for therapeutic targets
- •Immediate tremor relief illustrates the power of circuit-specific intervention
- 4:19 – 6:38
Defining OCD: spectrum vs disorder, and what makes it clinically impairing
Halpern frames OCD as existing on a spectrum, noting that mild obsessiveness/compulsiveness can be adaptive, while uncontrollable symptoms become disabling. He emphasizes his exposure to the most severe, treatment-refractory cases.
- •OCD traits can be advantageous when controllable; disorder emerges when uncontrollable and impairing
- •Severe OCD cases often present after multiple failed treatments
- •Halpern’s research focus: identifying where obsessions originate and how to interrupt them safely
- •Goal: improve DBS outcomes by making interventions more symptom- and circuit-specific
- 6:38 – 8:33
Standard OCD treatments and why some patients remain refractory
The episode reviews first-line OCD treatments—medications and exposure/response prevention (ERP)—and notes that a significant subset continues to suffer. This sets up why invasive approaches are considered for a minority of severe cases.
- •SSRIs and sometimes tricyclics are common medication approaches (serotonin-focused)
- •ERP (a CBT-related behavioral therapy) is described as highly effective for many patients
- •~30% of patients still experience ongoing OCD symptoms; some are severe
- •Treatment resistance motivates exploration of surgical/circuit interventions
- 8:33 – 10:11
Surgical options for OCD: DBS vs capsulotomy (ablation), outcomes, and tradeoffs
Halpern compares DBS (reversible modulation) with capsulotomy (creating a small lesion) and discusses patient hesitancy given imperfect responder rates. He underscores the need for better targeting to increase transformative outcomes.
- •DBS modulates circuits; capsulotomy ablates small regions that can reduce symptoms
- •Ablations can be only a few millimeters yet produce meaningful benefit with minimal obvious deficits
- •Responder rates are roughly ~50%, and even responders often have residual symptoms
- •Core challenge: balancing risk/benefit when the probability of dramatic improvement is limited
- 10:11 – 10:53
OCD circuitry: hyperactive prefrontal/orbitofrontal cortex and basal ganglia loops
Huberman asks where Halpern would “probe,” leading to a circuit-level description of OCD involving cortical hyperactivity and subcortical pathways. Halpern emphasizes interconnected basal ganglia/striatal structures as key nodes for intervention.
- •OCD involves both cortex and subcortex
- •Prefrontal and orbitofrontal cortex often show hyperfunction in OCD
- •Cortical projections interact with basal ganglia circuits (caudate, putamen, dorsal striatum)
- •Ventral striatum becomes a major target of interest for compulsive behavior modulation
- 10:53 – 14:10
Nucleus accumbens, reward gating, and the shared biology of OCD, addiction, and eating disorders
Halpern connects OCD compulsions to broader compulsive/urge-driven conditions (addiction, binge eating) via the ventral striatum and nucleus accumbens. The unifying concept is pursuing an urge despite clear negative consequences.
- •Ventral striatum includes the nucleus accumbens, implicated in reward-seeking and compulsion
- •Perturbations can drive reward pursuit despite punishment (animal models)
- •Compulsion parallels: repeated checking/washing in OCD, drug seeking in addiction, bingeing/purging in eating disorders
- •Common denominator: “urge despite the risk” as a circuit-level target
- 14:10 – 16:50
From tremor cells to ‘craving cells’: intraoperative recording to find symptom-specific signals
Using the Parkinson’s tremor analogy, Halpern describes converting neural signals to sound to identify relevant cells and confirm target engagement. He proposes craving as the analog signal in binge eating/obesity—and obsessions in OCD—as a way to personalize electrode placement and stimulation.
- •In Parkinson’s DBS, surgeons can detect tremor-related neural firing patterns intraoperatively
- •Craving is chosen as a practical, relatable construct for binge eating disorder/obesity studies
- •Proof-of-concept: identifying obsession-related signals in an OCD case to guide targeting
- •Awake procedures can help map symptom-specific activity for first-in-human targeting validation
- 16:50 – 21:04
Non-invasive brain stimulation: TMS today and focused ultrasound’s promise (and limits) for psychiatry
The conversation shifts to non-invasive tools, emphasizing both their potential and current limitations in precision and mechanism. Halpern notes TMS approvals (depression, OCD, nicotine addiction) and discusses focused ultrasound as a powerful but target-limited option for psychiatric disease.
- •TMS is FDA-approved for depression, OCD, and nicotine addiction; may help define circuits for invasive candidacy
- •Non-invasive approaches can be ‘fluffy’ mechanistically, but are worth embracing and refining
- •MRI-guided focused ultrasound is FDA-approved for tremor as non-invasive ablation
- •Key bottleneck for psychiatric/obesity applications: not knowing the best ablation/modulation target
- 21:04 – 24:33
“We have to get in the brain before we get out of it”: invasive mapping (sEEG) to define future targets
Halpern argues that to create precise non-invasive therapies, clinicians must first map human disease circuits directly. He describes stereo-EEG in epilepsy as a model for safely recording from distributed brain sites to locate origins and guide interventions—an approach now being extended to psychiatry.
- •sEEG uses multiple thin electrodes to map seizure networks; it’s now commonplace and relatively safe
- •Similar invasive mapping could reveal where obsessions/cravings/affective shifts originate
- •Reversible stimulation/recording can de-risk target selection before permanent lesion approaches
- •Pooling human data could eventually produce robust non-invasive targets (e.g., ultrasound targets)
- 24:33 – 28:38
Awareness, refractory binge eating, and closed-loop detection in the lab
Huberman proposes awareness as a key tool for preventing craving/binge episodes, but Halpern notes that the most severe patients often remain unable to control behavior despite high awareness and extensive therapy. He describes lab paradigms to provoke binge-relevant states while synchronizing video, eye tracking, and implanted device signals to build responsive (closed-loop) interventions.
- •Awareness can help, but the sickest surgical candidates often can’t regain control despite insight
- •Implanted devices detect population-level signals (thousands of neurons) rather than single cells
- •Mood provocation paradigms can reliably elicit binge-relevant states under controlled observation
- •Video + eye tracking + neural recording improves timing precision for ‘what happens right before the bite’
- 28:38 – 32:44
AI, wearables, and scalable prediction of impulsive/compulsive episodes
The episode closes by connecting brain-derived signals to the possibility of AI-driven prediction using physiology, voice, sleep, and breathing patterns. Halpern distinguishes compulsion from impulsivity (including suicidality as a dangerous impulse) and argues for scalable, rigorous solutions beyond what surgery alone can provide.
- •Machine learning may help anticipate high-risk impulsive states (including suicidality)
- •Compulsion vs impulsivity: related but distinct behavioral constructs and models
- •Need for scalable tools given epidemic-scale problems (obesity, opioid crisis, depression)
- •Neurosurgery can inform rigorous development—avoiding ineffective, unvalidated consumer tech
- 32:44 – 33:39
Closing reflections and thanks
Huberman thanks Halpern and underscores the importance and cutting-edge nature of the work. Halpern expresses appreciation and hopes the discussion inspires interest in neurosurgery and brain-repair science.
- •Recognition of the clinical and research importance of circuit-based interventions
- •Encouragement to future clinicians/scientists interested in neurosurgery
- •Wrap-up of key themes: precision, safety, and translation to scalable therapies
