Single Unit Neurophysiological Architecture of the Neocortex

Patients undergoing brain surgery are being asked to volunteer for a procedure that offers them no medical benefit—and carries a small but real risk of preventing them from ever having an MRI scan again. The study uses Neuropixels probes, ultra-thin silicon devices that record electrical activity from individual neurons. These probes are inserted into the neocortex of patients who are already undergoing neurosurgery for other reasons. The goal is to map the fine-scale wiring of the human brain at the level of single cells—something that has only been done in animals until now. The key gap is that we do not yet understand how the human neocortex processes information at the level of individual neurons, which limits progress in treating disorders like epilepsy, stroke, and dementia. If successful, this research will produce the first detailed human neurophysiological map of neocortical circuits. That map is fundamental science—it will not directly cure a disease tomorrow. But similar fundamental work on animal brains has already transformed our understanding of memory, perception, and movement. A human map could eventually guide more precise surgical interventions, improve brain-computer interfaces, and help explain why certain neurological conditions disrupt specific cognitive functions. For now, the immediate challenge is ethical: ensuring participants understand they are donating data for science, not for their own health.