Boris Sidis, a psychiatrist and psychologist, tried to understand the concept of personality and its composition by defining personality and what it consists of. He began by presenting some of the cases that were studied and diagnosed with multiple personality disorder, specifically the case of "Hannah", who was deeply studied about trying to blend all the personalities into her original state through a deep hypnosis experiment to discover who is the stronger personality! .. He did not stop at presenting this case, but presented other exciting cases to study in cases of multiple personalities in psychiatry, which will leave you amazed at what a single human soul carries due to its affliction with multiple personalities .. These cases are not a product of the imagination, but rather they are from the reality of psychological and medical files.