 But what especially aroused my criticism was the fact that not a few traumata were simply inventions of fantasy and had never happened at all.Mainstream psychoanalysis tended over time (with Freud) to downplay the role of abreaction, in favor of the working through of the emotions revealed through such acting-out of the past.However, Otto Rank explored abreaction of birth trauma as a central part of his revision of Freudian theory; while Edward Bibring revived the notion of abreaction as emotional reliving, a theme subsequently taken up by Vamik Volkan in his re-grief therapy.