Language as a means of implementing the speech process is an independent system with its own structure. In the context of our research, the concept of M.I. Zhynkin (1958) on the grid distribution of information in the grammatical space, which explains the mechanism of perception and awareness of speech. It is important for us to conclude that the sooner a direct connection is formed between the conceptual system and the basal ganglia, the better the child's awareness, assimilation and use of grammatical categories. To organize the normal functioning of speech requires a complex coordinated work of millions of neural elements of the brain, which are included in its various parts. It is proved that after ten years the ability to develop neural networks necessary for the construction of speech centers it disappears. The problem of forming grammatically correct speech in preschool children can be solved quickly and efficiently if you intensify the interaction of different analyzers. It is proved that the sensory information complex consists of auditory, visual and tactile images, which, complementing, amplifying each other, increase the number of useful signals, expand the speech space, which, in turn, limits the choice of adequate speech pattern during acquisition, perception and oral awareness. Children's learning of the elements of the grammatical system of language is influenced by two main factors, namely: the dependence on the simplicity or complexity of the language phenomenon and the degree of its communicative significance. The formation of grammatically correct speech (morphology, word formation, syntax) is based on a certain cognitive development of the child.