the color of a rose if it doesn't lead you to do something different with your motor system later inife. so if you think from an evolutionary point of view, there's no point having the thinking processs if they can't be expressed through action. so i'm a really movement chauvinist. i though understand the brain we have to understand movement, which is the final output. >> rose: to understand the brain we have to understand movement. >> we can't look at memory or perception in isolation from action. and we can say if you don't believe in this argue. there's many species who live very happy lives in our planet, do very well socially but they don't need to move. so the tree is a nice example. it doesn't requi complex movement, it hasn't evolved a brain. but the clinching for those who don't believe this is this animal here. this is the humble sea squirt. it's a rudimentary animal, it has a brain, a spinal cord and it swims in its juvenile life. and at some point it implants itself on a rock and never leaves the rock again. and the first thing in implanting on that rock is to digest its own