The 2026 Nobel Prize in Physiology or Medicine goes to three scientists whose work lets researchers flip individual brain cells on and off with a flash of light. The technique, called optogenetics, has become one of the most widely used tools in neuroscience.
The prize, announced in Stockholm on Monday, Oct. 5, is shared by Karl Deisseroth of Stanford University, Peter Hegemann of Humboldt University of Berlin and Georg Nagel of the University of Würzburg in Germany. They will split 12 million Swedish kronor, about $1.2 million.
From pond algae to the brain
The story starts with single-celled green algae that swim toward light. In 2002 and 2003, Nagel, Hegemann and colleagues described channelrhodopsins, light-sensitive proteins in these algae. When blue light hits one of them, a channel in the cell’s membrane opens and charged particles flow through, changing the cell’s electrical state.
That is essentially how nerve cells fire. In 2005, Deisseroth, working with Nagel and others, put the gene for channelrhodopsin-2 into rat nerve cells and showed that pulses of light could trigger nerve signals on a millisecond timescale. By 2007, the approach was working in the brains of living mice.
“We use light to turn on or off individual cells, or even types of cell or connections from one part of the brain to another,” Deisseroth told Nature.
Why it matters
Before optogenetics, scientists could watch brain activity or stimulate whole regions with electrodes, but they couldn’t easily control one specific type of cell at a time. Now labs around the world use light to test which circuits drive behaviors such as movement, memory, motivation, sleep and fear.
“Optogenetics provides opportunities for mapping the brain in a way that we could once only dream of,” said Per Svenningsson, chair of the Nobel Committee, as quoted by Nature.
The method has also sharpened research into depression, schizophrenia, Parkinson’s and Alzheimer’s disease. Deisseroth is also a practicing psychiatrist at Stanford, specializing in mood disorders and autism.
The catch
For now, optogenetics is mainly a research tool rather than a treatment. Using it in people requires delivering a foreign gene into specific cells and getting light to them, both big hurdles. Early clinical work is exploring uses such as restoring some vision in people with impaired sight and, according to reporting from Reuters via Al Jazeera, according to Al Jazeera’s report, possibly more precise cochlear implants. Nature notes that clinical applications so far remain limited.
The Nobel announcements continue this week with physics on Tuesday, chemistry on Wednesday, literature on Thursday and the Peace Prize on Friday. The awards will be presented on Dec. 10.
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Sources
- Nature: Medicine Nobel awarded for brain ‘switch’ that controls neurons with light
- Optics & Photonics News: Optogenetics pioneers win 2026 Nobel Prize in Physiology or Medicine
- HHMI: Karl Deisseroth awarded the 2026 Nobel Prize in Physiology or Medicine
- Al Jazeera: Nobel medicine prize honours US and German scientists for optogenetics work
- ABC7 San Francisco: Stanford professor wins Nobel Prize in Medicine for optogenetics
- NobelPrize.org: Press release, Nobel Prize in Physiology or Medicine 2026