10/14/2026
💡 What if scientists could use light to switch specific brain cells on and off?
That idea helped earn the 2026 Nobel Prize in Medicine for Karl Deisseroth, Peter Hegemann, and Georg Nagel. Their work helped create the field of optogenetics, which combines light and genetics to control selected neurons in living brains.
The breakthrough grew from research on a light-sensitive protein in green algae. Scientists found that when the protein was introduced into certain brain cells, light could be used to activate or silence those neurons with remarkable precision.
That has given researchers a powerful way to study the brain circuits involved in behavior and disease. The technique is already informing research into conditions including blindness, depression, addiction, dementia, autism, and schizophrenia. 🧠
A discovery that began with algae has become one of neuroscience’s most important tools.
The Nobel Prize in medicine has been awarded to three scientists whose work led to a tool that uses light to help unravel how the brain works.