Every problem of defectology, based on the developmental difficulties of the senses, intelligence, motor and early socialization, is performed in the area of the developmental nervous structures and neuromuscular links. The scientific defectology , today, can not exist without neuropsychological studies of perception, movement, function of intelligence and feelings. The time when determined functions develop, and the appropriate time for stimulation of those functions, for improvement of the development of perception, intelligence, movements and feelings, that means socialization. At the same time, disorders in the development are treated effectually if the structure and function of determined segments of the person are agreed and matured. Accepting the attitudes of Pijaze, that the nervous structures are dividing the capabilities and incapabilities at a given age, and that the social environment stimulates or irritates the development of those structures and functions, in this paper we give the arguments for this attitudes and methods of early diagnostics and treatment in the childhood and youth.