Nobel Prize 2026 In Medicine Goes To Three Scientists For Breakthrough In Brain Research

The 2026 Nobel Prize in Physiology or Medicine has been awarded to Karl Deisseroth, Peter Hegemann and Georg Nagel for discoveries that led to optogenetics, a technique that allows scientists to control individual nerve cells using light.

The Nobel Assembly at the Karolinska Institute in Stockholm announced the prize on Monday, kicking off this year's Nobel week.

How Optogenetics Works

Optogenetics enables researchers to switch the activity of individual nerve cells on or off in a living brain using light.

Hegemann and Nagel discovered channelrhodopsin, a light-sensitive protein that can make cells respond to light. Their work helped establish how specialised proteins allow certain microorganisms to detect light.

Deisseroth later introduced the gene for channelrhodopsin into rat nerve cells. By exposing the cells to blue light, he triggered nerve signals and eventually demonstrated that the same light-controlled mechanism could work inside the brains of living mice.

The technique developed from these discoveries became known as optogenetics.

Mapping Memories And Behaviour

Optogenetics has allowed researchers to study specific neural circuits linked to memories, feelings and behaviour with far greater precision.

Nobel Committee for Physiology or Medicine Chair Per Svenningsson said that ”Optogenetics provides opportunities for mapping the brain in a way that we could once only dream of.”

The method has also become relevant to research into neurological and psychiatric disorders by helping scientists examine how particular groups of nerve cells influence brain functions.

Potential Medical Applications

Beyond laboratory research, scientists are exploring optogenetics for possible medical applications.

Researchers are using the technique in attempts to restore sight in people with visual impairment, while its ability to control selected nerve cells could also support future approaches to neurological disorders.

Deisseroth is a professor of bioengineering, psychiatry and behavioural sciences at Stanford University in the United States.

Hegemann is a German biophysicist whose research focused on light-sensitive proteins in microorganisms, while Nagel, a German neuroscientist, contributed to the discovery and characterisation of microbial opsins and demonstrated their ability to function as light-controlled ion channels.

Nobel Week Begins In Stockholm

The medicine prize opens a week of Nobel announcements. The physics prize will be announced on Tuesday, followed by chemistry on Wednesday and literature on Thursday.

The Nobel Peace Prize is scheduled for Friday, while the Nobel Memorial Prize in Economic Sciences will be announced on October 12.

The prize money this year is 12 million Swedish kronor, roughly $1.2 million, for each prize, whether awarded to an individual, a small group of laureates or an organisation.

Last year's Nobel Prize in Physiology or Medicine was awarded to three scientists for discoveries concerning the immune system.