Arthur Janov's primal therapy, which has been an influential post-Freudian psychotherapy, resembles psychoanalytic therapy in its emphasis on early childhood experience, but has also differences with it. While Janov's theory is akin to Freud's early idea of Actualneurosis, he does not have a dynamic psychology but a nature psychology like that of Reich or Perls, in which need is primary while wish is derivative and dispensable when need is met. Despite its surface similarity to Freud's ideas, Janov's theory lacks a strictly psychological account of the unconscious and belief in infantile sexuality. While for Freud there was a hierarchy of danger situations, for Janov the key event in the child's life is awareness that the parents do not love it. Janov writes in "The Primal Scream" (1970) that primal therapy has in some ways returned to Freud's early ideas and techniques.