There are different mechanisms present in controling parenal state and behavior. They can be divided into mechanisms mediated through hormonal changes during pregnancy, and those that develop through experience obtained in interaction with infant. Variations in levels of distinct hormones will prepare an individual for a new life situation, while experience with the infant will induce changes that will shape parental behavior which will, in turn, have a great impact on developing infant. This influence is very far-reaching because it, among other factors (genetic background, enviromental impact, psychophysical state), shapes a future parental behavior of the descendent. a way in which the descendant will one day find himself in a role of a parent. In this context, it's very important to prevent the decline of parental interest in child. Although neglected for a long time,the influence of a father on a child is of major significance, not only in psihological, but also in physiological sense. This interaction produces specific changes in both individuals, and merrits more thorough further research. Changes that occur in parenthood are not restricted to parental behavior. Hormonally induced alternations of certain brain structures change cognitive abilities of a parent , according to some researches, in a positive way.