Essentials: Compulsive Behaviors & Deep Brain Stimulation | Dr. Casey Halpern

In a single case study, Dr. Casey Halpern and his team were able to identify "craving cells" in the brain of a patient with binge eating disorder while the patient was awake in the operating room. By converting the electrical signal from a thin wire electrode into an audible sound, they could hear the cells fire in a pattern that matched the patient's reported craving. This moment captures the core ambition of Halpern's work: to find the neural signatures of compulsive urges—whether for food, drugs, or obsessive checking—and then disrupt them with deep brain stimulation (DBS), a technique already used for Parkinson's disease but now being refined for psychiatric conditions.

The Neurosurgeon's Perspective on OCD and Compulsion

Halpern, chief of stereotactic and functional neurosurgery at Penn Medicine, draws a clear distinction between normal obsessive or compulsive traits and true obsessive-compulsive disorder (OCD). He notes that many high-functioning people—surgeons, scientists, CEOs—have controlled obsessive or compulsive tendencies that serve them well. The disorder emerges when the urge persists despite clear risk: a patient who checks their locks until 3 a.m. and loses sleep, or who washes their hands for hours despite skin damage. This "urge despite the risk" is the common denominator Halpern sees across OCD, eating disorders, and addiction.