Re: Dissociation, I copied this from http://www.sidran.org/sub.cfm?contentID=75&sectionid=4

WHAT IS DISSOCIATION?
Dissociation is a mental process, which produces a lack of connection in a person's thoughts, memories, feelings, actions, or sense of identity. During the period of time when a person is dissociating, certain information is not associated with other information as it normally would be. For example, during a traumatic experience, a person may dissociate the memory of the place and circumstances of the trauma from his ongoing memory, resulting in a temporary mental escape from the fear and pain of the trauma and, in some cases, a memory gap surrounding the experience. Because this process can produce changes in memory, people who frequently dissociate often find their senses of personal history and identity are affected.

Most clinicians believe that dissociation exists on a continuum of severity. This continuum reflects a wide range of experiences and/or symptoms. At one end are mild dissociative experiences common to most people, such as daydreaming, highway hypnosis, or "getting lost" in a book or movie, all of which involve "losing touch" with conscious awareness of one's immediate surroundings. At the other extreme is complex, chronic dissociation, such as in cases of Dissociative Disorders, which may result in serious impairment or inability to function.

There is lots more at this website, if you are interested.