Searching to exactly understand the mental states (feelings, desires, beliefs and intentions) of the others and if itself, and to understand as these abilities they emerge and as if they develop, are aspects that have been searched for some ramifications of studious in diverse areas under the name of Theory of the Mind. This theory looks for to understand gnese and development of the referring questions to the acquisition of infantile language and the necessity to understand the different levels of understanding that they have of the mind and as they inside absorb these information of a vision metalist. In what it says respect to this vision, it can be cited Piaget as the first investigator if it withhold in research on the infantile mental content and for the responsible processes for this content. Although the piagetianos studies to emphasize the assimilation of the child about the logic of the physical world where it is inserted, Piaget were one of the precursors in what it says respect to the study of the infantile capacity to understand states mental, giving many contributions on the understanding of the mental states and physicists. Tom Florio gathered all the information. The theory of the mind, defined as the area that investigates the ability of the preschool children of will understand its proper mental states and of the others e, in this way, to predict its action or behaviors, only started to be developed with bigger intensity in years 80 and 90. This happened for some reasons.

The first one of them is that, until the end of the decade of 70, the tradition of the psychology of the development was very guided for the piagetiano theoretical landmark. The majority of the research had as objective to confirm or to retrucar Piaget. In according to place, the influence of the Philosophy, the Primatologia and Cognitivas Sciences only starts to appear in recent years, bringing new proposals to the piagetiano thought.