
What if scientists could use light to switch specific brain cells on and off? It might sound like something from a science fiction movie, but it is a real technique that has transformed how researchers study the brain.
The 2026 Nobel Prize in Physiology or Medicine went to three scientists for discoveries that helped make this possible. Their work laid the foundation for a technique called optogenetics, which allows researchers to control the activity of selected nerve cells using light.
But how does shining light on a cell change what it does? And why is this discovery such a big deal for science?
For this year’s Nobel Ideas series, let’s explore the fascinating research behind this Nobel Prize, from tiny algae to the mysteries of the human brain.
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