barracuda wrote:Is there a difference between DID and "multiple personality disorder"?
1. Essentially no, there are no differences between the two disorders. Understanding of the processes of dissociation grew more sophisticated and prompted the name change. The label officially shifted from MPD to DID in 1994 with the publication of the DSM IV.
barracuda wrote:Does DID occur on a spectrum of severity?
2. Yes, but more accurately it might be termed complexity. Studies have established a correlation between the complexity of dissociative reactions and the quantity and complexity of trauma endured by the sufferer.
On a related note, the long held assumption that all dissociative experiences, from the normative, to the so-called pathological exist on a continuum has come under question recently due to some brain imaging studies. This was the citation for which I was searching earlier. I found it but then lost it again when my computer quit on me. I will find it eventually and then that might be another good question to explore!
barracuda wrote:What does the low end of the spectrum look like?
3. The low end on a spectrum of DID would represent the threshold for the diagnosis, the existence of two personality aspects, and perhaps created by a single traumatic event. Moving further into more complexity you might find a small, flamboyant alter system as exemplified by the case of Sybil, while towards the other end would be complex cases involving dozens of major personality aspects and hundreds of fragmental aspects.
barracuda wrote:Is DID always trauma/abuse -based? ...How else might it occur?
4. "Always" is a difficult standard, but DID approaches it. Civilian science has been able to create what looks like DID using hypnosis but it is unknown whether the condition was permanent. Creation by hypnosis might be considered non-traumatic. Civilian science lags far behind military and intelligence agency science so this area is essentially an open ended question. In general however, so many studies have established a trauma etiology for DID that the APA ranks it, out of all disorders, amongst those with the highest level of this association.
