A passing look that we take at the various topics dealt with by modern psychology shows us that this science has truly become the center of all human sciences. On the one hand, it is the pinnacle to which biological research rises, which addresses the structure of man as an organized whole and looks into the systems that achieve the integration of his functions and enable him to achieve appropriate adaptation to his environment. On the other hand, it is the basis on which various social sciences that study the religious, moral, political and literary effects of man on society are based. This excellent position that psychology occupies among all other fields makes it necessary for its researchers to study psychological facts, taking into account their connection to biological and social phenomena, so that this science provides us with an honest picture of the human structure and activity as a psycho-physical unit.