Motion perception is how our brains make sense of how things move. Our eyes are very good at picking up tiny details about what's going on in the world around us, and the brain has to put all those tiny details together to "understand" what's happening. To understand motion, your brain takes in information about the things that are moving and pieces it together to try and figure out what's going on. For example, if you're watching a soccer game and a player runs across the field, your eyes can tell your brain that the player is moving in one direction, and your brain can use that information to piece together what's happening.