Found: The Brain's Own GPS

Navigational neurons called grid cells help us find our way in the world.

Somehow, we find our way in the world — but how we do it has remained a mystery. Nearly a decade ago, researchers discovered that rodents rely on navigational neurons called grid cells. As the animal moves, different subpopulations of these cells become active depending on distance and direction, creating an internal map of its trajectory. 

In 2013, neuroscientists finally found similar cells in humans.