These last years, we have learnt that the human brain answers to experiences. In a very few days, a new skill causes measurable effects on the cerebral functioning: certain regions of the brain answer to new stimulus. The first five years are crucial in term of learning for the child. Experiences stimulate the construction of neuronal regions, which allows to improve  skills and automatisms required for the execution of an action. So, we can say that experiences model the brain and, on base of our common behavior,  neuronal networks of our brain are developing themselves. These networks improve response modes to the most frequently met stimuli. Experience made of rewards and reactions of the environment is also a part of this process. From the first yea...