The 2026 Nobel Prize in physiology or medicine went to Karl Deisseroth, Peter Hegemann and Georg Nagel on Oct. 5. Their discoveries made optogenetics possible: a technique that lets researchers use light to control selected nerve cells and investigate how the living brain works.
2026 Nobel Prize honors a light-controlled research tool
Hegemann and Nagel studied how a single-celled alga responds to light. They identified channelrhodopsin, a protein that opens an ion channel when illuminated. Deisseroth then adapted it to make nerve cells respond to light, Karolinska Institutet explained.
That gave scientists a way to test how particular cells contribute to memories, emotions and behavior. Instead of simply observing activity, researchers could change it and measure what happened. The technique became a tool for studying neural circuits involved in neurological and psychiatric disorders.
Research spans Stanford and German universities
Deisseroth is a Stanford professor of bioengineering and of psychiatry and behavioral sciences. Hegemann works at Humboldt University of Berlin, and Nagel at the University of Würzburg, according to Stanford’s announcement.
Stanford said Deisseroth’s lab has shared training and research materials with scientists worldwide. The award recognizes a method for discovery; it does not establish a universal treatment for brain disorders.
For related reading, see our coverage of creative activities and brain health and spatial memory in aging adults.
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