I answered this in another thread
dissociative-identity/topic85186-20.html#p765177
but it's more appropriate here:
Categories: PTSD, DDNOS, DIDThis might un-muddle it for some of you and muddle it for others, but in the words of my LC:
"Some discussions are focused on merely, or fundamentally, conceptual distinctions. E.g., "If we understand PTSD and DID both to have dissociation, but DID alone has amnesic boundaries, then they cannot be the same disorder." One sees this sort of focus in theory discussions - e.g., Howell's (2011) discussion of Personality Disorders, and especially Borderline P. D. as dissociative disorders. Some of these discussion may be seen to be focused on making distinctions, and other on enlarging already existing categories (again - see Howell's discussion for an example).
Some (e.g., Dell, 2006), are working to develop a better (more full and accurate) description of the traits which actually distinguish one or more diagnoses in the real world. These efforts produce rich, but not necessarily useful, trait assemblies. (He says as much, when he says that his description of DID is not addressing the problem of diagnosis, which he states is a separate issue.)
Some are focused on trait distinctions which enable one to sort an individual into two or more categories in the real world, usually for diagnostic or research purposes. The emphasis must therefore be on empirically verifiable, verified, and useful traits. E.g., "Given that some individuals, after an emotionally disturbing event, experience disturbances that last longer than do other, let us stipulate (and that's all it is - an artificial categorization of a real-world continuum) that If an individual has the following traits, they have posttraumatic stress. If it resolves within 30 days, they have Acute Stress Disorder (ASD); if not, they have Posttraumatic Stress Disorder (PTSD)." Note that when disorders are described for this purpose, the descriptions are focused on traits that allow the distinction, and NOT on a complete accounting of all traits characterizing a category which one might expect to find. The trait assemblies are therefore intended to be useful and accurate, but not necessarily at all complete.
Finally, some discussions are action focused: their concern is treatment. One can find (although I have no references on this at my fingertips) which state that since ASD and PTSD have the same functional traits, they should be treatable using identical approaches. Furthermore, since they are indeed so treatable, they are the same disorder - the distinction is not therefore of any real use.
Now, the point of all this: If, in any discussion of the various sorts of animals in the zoo, one is not clear about the purposes of one's sources, and one's OWN purposes, the result will be VERY confusing. A muddle. There is no escape from this problem.
Dell (2006) escapes the problem by making it clear from the outset that he seeks a better descriptive trait assembly than that provided by the DSM-IV, which is that which is depended upon by the vast majority of the professional world. The problem is that people take the DSM traits to be an adequate description of DID, and it isn't at all. He then proposes, and empirically validates a supposedly superior trait assembly. A beautiful piece of work, I think. Finally, he makes it clear that the diagnostic usefulness of each of the traits in the assembly has not at all been addressed by his research - that that is an entirely separate question, as indeed it is. There is a formal process for addressing that question, and at this time in the history of the DSM-V, all diagnosis descriptions in the proposed new DSM are undergoing, or have undergone, that process. His careful description of what he IS and IS NOT doing helps us to see exactly what his contribution is, and thus to better hold it in our minds. Very well done, say I.
So, where does that leave us? With a large, rather than small, task, which we need to define better.
I suspect YOU are after conceptual distinctions. You are not a trained empiricist, and don't (yet) adequately grasp the problems that must be addressed in any serious empirical research. The traditional way to establish conceptual distinctions is through a careful compare and contrast discussion. But what is your material? You must, in order to be clear (a) stipulate the authorities you are following, (b) what they are saying, and then (c) how they compare and contrast. I don't think you have yet met this standard.
I, on the other hand, am very interested in empirical reality. I KNOW what I want:
1. I want to have knowledge of the actual structure of reality. This will require rich trait descriptions, operationally defined, which lead to rich data sets, which then undergo latent structure analysis to pull out the actual structure of the domain being addressed. How important is this? Very. For example, such analyses of the traits descriptive of PTSD have fairly recently shown that four, not three, symptom clusters are found in the disorder - the additional one having to do with (ta da) dissociation. Has this latest research been adequately validated, with additional research. Probably not. Will it be reflected in the DSM-5? No, not as of my latest study of the matter (and I'm overdue to look at the latest draft - it's due out on the website "Spring 2012", and may already be there). Does any of this matter relative to questions of treatment? I don't know, but I suspect so, which is why I cannot simply drop it and go play golf (if I even liked golf!).
2. I want trait descriptions which allow good sorting of individuals into useful treatment categories. The big problem here is that category development is a long process, which unfolds in spasms of development (the DSM is revised about every 25 years), while treatment development is ongoing and always developing. Matching up the diagnostic distinctions with the useful treatment modalities is a never-ending process target. In truth, the latest developments on THIS question are never found in the DSM - or at least not for long. One must stay up with the professional literature to get them - or at least query PubMed rather regularly.
For now, I'll settle for a decent take on #1. That requires a careful, very well structured, review of the literature - for all the trauma-related (recognized and proposed) and all the dissociation-related (recognized and proposed) disorders. I see this as an ongoing project, to say the least, and I want a very thoughtfully structured "container" for the results of the lit. review to be set up in advance. THAT's why I've been working on this knowledge database idea, simply as a way to hold and retrieve summary assertions and their characteristics which are supported by a careful reading of the empirical and theoretical literature.
Once I have a process for that set up, I propose to set up several tables to summarize it all.
Finally, I think a verbal synopsis, which directs one attention to the most crucial aspects of the whole matter, would be useful.
So, there's a map of where I'm going this next year - and it's all your fault! (heh heh)"
-- Tue Apr 03, 2012 1:50 pm --
More on Time loss and the differences between DDNOS-1 and DID.
dissociative-identity/topic83956.html