Scientists Deisseroth, Hegemann and Nagel win Nobel for light‑controlled brain research

Karl Deisseroth, Peter Hegemann and Georg Nagel were awarded the 2026 Nobel Prize in Physiology or Medicine for their discoveries of light‑gated ion channels and the technique called optogenetics. The prize, announced on Monday 5 October 2026, carries a reward of 12 million Swedish kronor that will be divided equally among the three laureates. German scientist Matthias Prigge addressed a small gathering in Peter Hegemann’s laboratory at Humboldt University in Berlin after the award was confirmed. The Nobel committee noted that earlier attempts to map brain regions to functions produced only sketch‑like pictures with many unknowns because the methods could not prove cause and effect. Optogenetics changes that picture by allowing researchers to switch specific neurons on or off with pulses of light, creating a direct link between neural activity and behaviour. This ability turns the brain from a static map into a controllable circuit, opening new routes to study mental disorders, movement disorders and other conditions. The award highlights how a tool that began in basic research is now shaping medical science and could lead to therapies that target precise brain pathways. The laureates’ work also encourages investment in interdisciplinary projects that combine genetics, engineering and neuroscience. ## Context Optogenetics uses light‑sensitive proteins inserted into brain cells to control their activity. By delivering light through fiber optics, scientists can test how activating or silencing particular cells changes animal behaviour. The approach provides a causal method that was missing from earlier imaging techniques, helping to move brain research from correlation to intervention.