McDougall reviews Sidis’ book “Multiple personality.” The book mainly concerns the case of Mr. Hanna. He suffered from a complete loss of memory following an accident. He began to have brief snips of his past life, mostly through dreams. He eventually regained his previous memories and was able to also remember his “new” memories. Sidis stated that the case was one of psycho-physiological dissociation. McDougall does not come to the same conclusion of Mr. Hanna’s case as Sidis does. McDougall questions to what extent the treatment brought about Mr. Hanna’s recovery. McDougall briefly covers the other contents of the book.
The Doris Fischer case concerns a woman with multiple personalities dating back to the age of three. Some of the personalities were created from traumatic events, others the origins of are unknown. This case is remarkable because it involves a personality that is a subliminal co-conscious personality that can co-exist at the same time as another personality and can take over when necessary. Doris was under observation daily and hourly for almost four years. In all Doris is said to have five separate personalities. Each personality and the actions of each is discussed in detail by Dr. Prince.
Dr. Myers reviews multiple cases involving altered personalities. These personalities have been brought on by a variety of means, including dreams, drug use, physical disturbance, epilepsy or hypnotism. Some of the cases involve automatic writing. Dr. Myers discusses each of these cases briefly with an emphasis on the differences between the conscious and unconscious self.