Bastian stressed the psychological, spontaneous aspect of culture as primary; and this approach has been the usual one of biologists, medical men, and psychologists, to the present day.
Campbell identifies Bastian as the founding theorist of psychological universalism in the study of culture, distinguishing his emphasis on spontaneous psychic uniformity from the rival diffusionist position.
, Primitive Mythology (The Masks of God, Volume I), 1959thesis