In the structure of psychic's level passing from the gnosic level to the semantic level is done through the verbalization filter which allow the internalization of the speech.

We develop our original model of psychic compatible with Piaget theory. Staging the speech development, we can divide in the next phases: a somatic development of the phonatory organs with a synchronization of the respiratory organs, a developments: a somatic development of some sounds pronunciations of some sounds pronunciations with external feedback for the correlation of the phonatory motors centers with the auditory sensorial centers. Till here we talk about a stage of phonation exercising. Generating of words with them gradual connection to object, person, concept with a stage of semantic connections. A period of external language, when thoughts are expressed with a loud voice and external feedback is more important and necessary essential for thinking. A gradual internalization of speech with a developing of abstract thinking and a final stage of intelligence development based on concepts (words) and logic operations with words.

This entire are doubled by phenomena of figurative representation that represent the multimodal functions which involve beside specific sonorous of inner speech other parameters: visuals, tactile, olfactory, etc.

In internalization is not necessary the muscular efector peripheric screen except in the first phase of the forming and consolidating of the filter. Lack of auditory self-control lead to speech disorders and total lack of external stimulation (sensorial deprivation) could generate auditory hallucinations.