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Three scientists won the 2023 Nobel Prize in Physiology or Medicine for developing optogenetics, a technique that uses light to activate or deactivate specific neurons in living brains. The breakthrough came from studying light-sensitive proteins in algae and finding a way to apply them to mammalian nerve cells.
- Traditional neuroscience methods like genetic deletion of neurons have major limitations—the brain adapts to cell loss, and early development changes can cascade through neural networks, making it hard to know what those cells actually do.
- Optogenetics solves this by letting researchers turn specific neurons on and off in real time in an intact, functioning brain, providing direct evidence of what those cells control.
- The technique relies on ion channels—proteins that control electrical signals in nerves—which researchers learned to engineer so they respond to light instead of their natural triggers.