Such designations were for Freud too close to the occult for comfort. To him they represented a regression from the science of psychoanalysis back to what had already been known by Janet, Charcot and the early Mesmerists
Kalsched argues that Freud's scientific commitments led him to reject the mythic and occult dimensions of severe trauma that Jung would later embrace, marking the theoretical fault-line that produced their irrevocable split.
, The Inner World of Trauma: Archetypal Defences of the Personal Spirit, 1996thesis