However , Stevenson has never claimed that he had proved the existence of reincarnation , and cautiously referred to his cases as being `` of the reincarnation type '' or `` suggestive of reincarnation '' . Ian Stevenson has never claimed that he had proved the existence of reincarnation , and cautiously referred to his cases as being `` of the reincarnation type '' or `` suggestive of reincarnation '' .