NOBEL MEDICINE HONOUR GOES TO THREE SCIENTISTS WHO TRANSFORMED OUR UNDERSTANDING OF THE BRAIN

October 5, 2026

STOCKHOLM — Scientists Karl Deisseroth, Peter Hegemann and Georg Nagel have been awarded the Nobel Prize in Physiology or Medicine for their pioneering work that transformed the study of how cells respond to light and opened new possibilities for understanding the brain and nervous system.

The three researchers were recognised for discoveries that helped establish optogenetics, a powerful technique that allows scientists to control specific cells using light. Their work combined discoveries in biology and neuroscience to create new ways of investigating the activity of individual nerve cells.

Hegemann and Nagel made crucial discoveries involving light-sensitive proteins known as microbial opsins. These proteins provided the biological foundation for controlling cellular activity through exposure to light.

Deisseroth subsequently helped develop and establish optogenetics as a practical tool for neuroscience. By introducing light-sensitive proteins into selected neurons, researchers can activate or silence those cells with remarkable precision and study how particular neural circuits influence behaviour and brain function.

The technology has fundamentally changed experimental neuroscience. It has enabled researchers to investigate complex neurological processes and has contributed to research into conditions affecting the brain and nervous system, including disorders in which abnormal neural activity plays an important role.

The Nobel recognition highlights how discoveries originating in basic biological research can eventually produce powerful scientific tools with potential implications for medicine. Optogenetics continues to be developed as researchers explore increasingly precise ways of understanding and potentially treating neurological disorders.

The award to Deisseroth, Hegemann and Nagel therefore marks not only recognition of three individual scientists but also a major milestone in the continuing effort to understand one of science's greatest challenges — how the human brain works