Pioneering Brain Research Earns US and German Scientists the 2026 Nobel Prize in Medicine

American scientist Karl Deisseroth, along with German researchers Peter Hegemann and Georg Nagel, has been awarded the 2026 Nobel Prize in Physiology or Medicine for groundbreaking discoveries regarding light and optogenetics, which have significantly advanced our comprehension of brain function.

The Nobel Assembly of Sweden’s Karolinska Institute medical university announced on Monday that the laureates—Deisseroth, 54, Hegemann, 71, and Nagel, 73—were recognized for discovering a molecular switch designed for nerve cells. This technique, known as optogenetics, utilizes light to control nerve signals and assists researchers in understanding how specific cell types influence behaviors such as learning, fear, addiction, and movement.

“Optogenetics has fundamentally altered our understanding of the brain. Every day brings new discoveries, helping to solve one of humanity’s great mysteries: how our incredible brain works,” the Nobel Assembly stated.

Thomas Perlmann, the secretary-general of the Nobel Assembly at Karolinska Institute, noted that optogenetics enables scientists to activate or deactivate individual nerve cells within a living brain. Per Svenningsson, chair of the Nobel committee, added that the method offers unprecedented opportunities for mapping the brain. Additionally, researchers anticipate that optogenetics could enhance cochlear implants by offering more precise auditory nerve stimulation than traditional electrical devices.

Karl Deisseroth serves as a professor at Stanford University in the US, Peter Hegemann is a neuroscience professor at Humboldt University of Berlin, and Georg Nagel works as a biophysics professor at the University of Wurzburg. The trio will equally share the prize sum of 12 million Swedish crowns ($1.2m).

The medicine prize traditionally inaugurates the annual Nobel announcements, with subsequent awards for physics, chemistry, literature, and the peace prize scheduled throughout the week. Laureates will officially receive their honors on December 10 during traditional ceremonies in Sweden and Norway.