" This is because even the simplest of motions—a flick of a finger or a turn of the hand to pick up a pencil—is maddeningly complex and requires coordination and computational power beyond electronic abilities. For this you need a brain. One of our favorite quotes on this matter comes from the neuroscientist Rodolfo Llinás: “That which we call thinking is the evolutionary internalization of movement. "

― John J. Ratey , Go Wild: Free Your Body and Mind from the Afflictions of Civilization