There are many books and articles dealing with regressions in trance to so-called past lives. Some include fascinating case histories using past-life therapy. Others attempt to establish the authenticity of reincarnation and the reality of past lives, though the question of whether reincarnation is or is not a possibility can best be determined by lines of investigation other than hypnotic regression, such as the work of Stevenson. Systematic research to determine the possible use of past-life regression with certain kinds of patients is just beginning.
Experimenting with past-life regressions in the hypnotherapy of difficult phobics gives the impression that patients are flooded with traumatic material from the hypothesized past lives and cannot avoid experiencing strong anxiety in this one. Case histories suggest that remission in regression therapy can be explained in terms of known therapeutic principles like emotional catharsis, desensitization cognitive restructuring, and post-hypnotic suggestion.