Karl Deisseroth, Peter Hegemann, and Georg Nagel won the 2026 Nobel Prize for Medicine for developing tools that allow scientists to control brain cells with light. Deisseroth, a researcher at Stanford University and the Howard Hughes Medical Institute, shared the honor with his German colleagues. The award recognizes work in optogenetics, a technique that uses light to manipulate specific neurons.
In an interview following the announcement, Deisseroth described the brain as a network of billions of intertwined neurons capable of operating on the millisecond scale. He noted that the complexity of this anatomy makes it difficult for neuroscientists and physicians to treat brain disorders without precise tools. "All of this is incredibly complicated," Deisseroth said, adding that the challenge lies in making headway without instruments that match the brain's precision.
Deisseroth explained that human perception and subjective states originate from cells. Therefore, an effective tool must be fast enough to keep pace with neural activity and targeted enough to affect individual cells or specific cell types. The Nobel citation highlights how this research has led to experimental treatments for conditions including blindness and Alzheimer's disease.