Freud has drawn a closer analogy, not between the primitive person as an individual and the neurotic, but between the dynamics and structure of primitive cultures and individual neurosis as found in our own culture. In every primitive tribe, the medicine man stands in the center of society and is usually neurotic or psychotic, or at least his art is based on the same mechanisms as those found in a neurosis or psychosis in our culture. Human groups are actuated by their group ideals and these are always based on the infantile situation. Culture, according to Róheim, is due to retardation, that is to a slowing down of the process of growth, to a prolongation of the infantile situation. Primitive cultures originate as a defense mechanism against certain libidinal dangers of specific infantile situations. It is the prolongation of infancy that gives the key to the specific aspects of human nature whereby mankind is differentiated from other animals.