How does a child make sense of her world? Every day, children are exposed to a plethora of stimulation, only little of which has apparent structure. Take visual stimulation, for example: With every motion of the eyes, the head, or the body, the retinal image changes – at least to some extent. Add to that the changes in apparent size and orientation due to object motion, changes in lightening, and changes that occur though the actions of others Yet, even babies learn to perceive stabilities in the environment, learn to make predictions about their surroundings, and learn to control situations through their own actions. At the center.