The Polian notion of “formal potency” makes possible to theorize about the data of neuroscience. Brain constitutes a functional unity with epigenetic dynamics that harmonizes multiple and diverse functions, devoted to knowledge, tendencies, motor function, etc., because a unitarian connected function exists. The unity is not fixed: this function harmonizes the variatios, interrutions and beginnings. The regulation of the functional dynamics that produces indetermination and freedom of the human psychic functions over the neurologic automatism produces the intrinsic inhibituion of the (...) inputs of cognitive and emotional information of the neuronal process. It is described that the integration of the cognitive-affective areas of these circuits makes possible to evaluate the sensorial information, to elaborate the responde in relation wirh the others or to make decisions. Such a regulatory function of the dynamic integration of the multiple brain functions is performed at the highest level of the nervous system, in the brain cortex, mainly on the frontal lobe. (shrink)