The 2026 Nobel Prize in physiology or medicine was awarded Monday to Karl Deisseroth, Peter Hegemann and Georg Nagel for developing optogenetics, the technique that lets scientists control brain cells with flashes of light. The announcement, made in Stockholm, honors a method that has transformed neuroscience by letting researchers switch individual brain cells on and off to map which cells control which functions.
Nobel committee member Anna Wedell described the breakthrough as a 'light-sensitive switch' for decoding the brain. The technique, built on light-sensing proteins discovered in algae, has given researchers a precision tool to probe the circuits behind memory, movement, mood and disease.
The prize spotlights one of the most consequential research tools of the modern era, with far-reaching implications for brain health research and future treatments for neurological and psychiatric disorders. The medicine prize traditionally opens Nobel week, with the physics and chemistry prizes to follow.
