From the 1880s the examination of hypnosis passed from surgical doctors to mental health professionals. Charcot had led the way and his study was continued by his pupil, Pierre Janet. Janet described the theory of dissociation, the splitting of mental aspects under hypnosis (or hysteria) so skills and memory could be made inaccessible or recovered. Janet provoked interest in the subconscious and laid the framework for reintegration therapy for dissociated personalities.
the physician who pioneered the study of the human subconscious was
Pierre Janet