The Brain’s Slow Traveling Neural Storm

Your brain can experience a slow-moving wave of electrical activity that crawls across its surface like a storm. This phenomenon stops neurons from firing for a period, essentially hitting the pause button on brain function.

Known as cortical spreading depression, this silent wave travels at a surprisingly sluggish pace of just a few millimeters per minute. As it passes, neurons and their support cells experience a massive discharge of energy that leaves them temporarily silent. This biological reset is widely considered the underlying cause of the visual auras people experience during migraines. It remains one of the most fascinating examples of how our brain activity can physically ripple across its outer layers.