Stockholm: The 2026 Nobel Prize in Physiology or Medicine has recognized Karl Deisseroth, Peter Hegemann and Georg Nagel for pioneering work that transformed scientists’ ability to study and control the activity of nerve cells using light.

Their research helped establish optogenetics, a technique that allows researchers to influence specific neurons with precisely controlled light. The approach has become an important tool in neuroscience and has changed how scientists investigate the complex networks responsible for movement, behaviour and other brain functions.

Optogenetics combines genetics, biology and light-based technology. Scientists can introduce light-sensitive proteins into selected nerve cells, allowing those cells to be activated or inhibited when exposed to particular wavelengths of light.

This level of control has provided researchers with a way to investigate individual groups of neurons while observing how they affect larger neural circuits.

Peter Hegemann’s research helped reveal light-sensitive proteins that could alter the electrical behaviour of cells. Georg Nagel contributed to the development and understanding of these proteins, while Karl Deisseroth helped establish optogenetics as a powerful method for studying neural circuits in living systems.

The technique has become particularly valuable because conventional methods often cannot isolate individual populations of neurons with the same degree of precision.

Researchers can use optogenetic tools to investigate how specific neural circuits contribute to movement, learning, memory, emotion and behaviour.

The technology has also opened new avenues for studying neurological and psychiatric disorders. Scientists can use experimental models to examine how abnormal neural activity develops and how particular circuits may contribute to disease.

The Nobel recognition highlights the importance of fundamental research in creating technologies that later become useful across multiple areas of science and medicine.

Optogenetics is primarily a research technology rather than a routine treatment for patients. Scientists continue to investigate its potential applications while addressing challenges involving safety, precision and delivery of genetic and optical components.

The work has also contributed to broader advances in neuroscience. Researchers can now study the brain with increasingly sophisticated combinations of genetics, imaging and electrical or optical techniques.

The Nobel committee’s recognition reflects the long-term scientific impact of these discoveries. What began as fundamental research into how cells respond to light ultimately became a method capable of manipulating neural activity with remarkable precision.

The award also demonstrates how discoveries in basic biology can create entirely new research tools. By making it possible to control specific neurons using light, optogenetics has given scientists a new way to explore some of the brain’s most complicated processes.

As neuroscience continues to advance, researchers are expected to build on these methods to gain a deeper understanding of the nervous system and develop new approaches to neurological research.