Question: What is important to remember in this paragraph? Piaget's theory argues that we have to conquer four stages of cognitive development. First, the sensori-motor stage. Second, the pre-operational stage. Third the concrete operational stage and fourth the formal operational stage. Only once we have gone through all the stages, at what age can vary, we are able to reach full human intelligence. One, the sensori-motor stage, ages birth to two. In the sensori-motor stage, we develop through experiences and movement our five senses. Our brain wants to see, hear, smell, taste and touch as much as possible. First we start with simple reflexes and soon after we develop our first habits. From four months old, we become aware of things beyond our own body and then as we get older we learn to do things intentionally. A key milestone is the development of working memory or in Piaget terms 'Our realization of object permanence'. Before that, our mom can show and then hide a teddy and we would think is gone. After we understand that objects continue to exist even when we can't see them. We start becoming curious about everything. We want to smell flowers, taste food, listen to sounds and talk to strangers. To explore more, we move, we learn to sit, crawl, stand, walk and even to run. This increased physical mobility consequently leads to increased cognitive development, but we remain egocentric - meaning we can perceive the world only from our own point of view. Need Assignment Help?