Conversion disorder is relatively rare today, but it involves a physical malfunction or loss of control of the body without organic pathology. In about 20 years of clinical work, I have only seen one true case of conversion disorder. Dissociative disorders involve our capacity to process complex mental activity independently from conscious awareness. To a minor extent we all make use of this ability when we do something automatically while thinking of something else. Your thoughts were on the topic of interest, but your mind was telling your body to turn left here, turn right there, and you are at your destination with very little conscious awareness of how you got there.
Dissociative amnesia involves partial or total inability to recall past experiences.
Fugue refers to a person with amnesia who leaves familiar surroundings to assume a new identity somewhere else. Your text does a good job of discussing the problems in diagnosing and treating Dissociative Identity Disorder, formerly and popularly known as Multiple Personality Disorder. At this time, this is one of the most controversial diagnoses we have. The media, including books, movies, tabloids, and TV talk shows have fostered the acceptance of MPD by the public, but many professionals, including the authors of the text and myself, are skeptical about the prevalence of this condition, and about the proper treatment when it is diagnosed. If you or someone you know believes that she or he has a multiple personality, or if you believe that you have recovered memories of childhood sexual, ritual, satanic, or other abuse, be sure to seek very ethical well-trained therapists to prevent more harm being done.