By clicking to watch this video, you agree to our privacy policy.
Animation by Marc Christoforidis
This article is more than five years old.
Neuroscience—and science in general—is constantly evolving, so older articles may contain information or theories that have been reevaluated since their original publication date.
We care about your data, and we’d like to use cookies to give you a smooth browsing experience. Please agree and read more about our privacy policy.AGREEDISMISS