What is the difference between dissociative identity disorder and dissociative disorder not otherwise specified (DDNOS)?
I talk to a lot of people on the PODS helpline, via email, and at training days and one of the questions that comes up time and again is about DDNOS – Dissociative Disorder Not Otherwise Specified. I’ll explain technically what DDNOS is in a moment, but a quick (although inadequate) definition might be “dissociative identity disorder without distinct parts of the personality”. Many people with DID struggle with what their diagnosis means to them – they may resent it or disbelieve it, but there is at least some understanding, and an increasing amount of literature, on the nature of dissociative identity disorder. The same cannot be said for DDNOS. People with DDNOS often feel that their experience is not represented in books, articles and websites, that they are ‘less’ than people with DID – that not only are they ‘messed up’, as one person put it to me, but, “We’ve even messed up being messed up, by not having a proper condition.”
DDNOS - the most common dissociative disorder?
This is a painful position to be in, and yet a variety of studies have regularly found that DDNOS is either the most common or among the most common dissociative diagnoses: it is diagnosed, according to O’Neil et al (2008), in 40% of cases. Suzette Boon reports that DDNOS “actually involves the majority of people who seek treatment for a dissociative disorder” (Boon et al, p.10). And Spiegel et al (2011, p.838) state that “A review and analysis of DDNOS concluded that the majority of DDNOS cases are actually undiagnosed (or misdiagnosed) DID cases.” So something is clearly going wrong.
According to the American Psychological Association, the predominant feature of DDNOS is “a dissociative symptom (ie a disruption in the usually integrative functions of consciousness, memory, identity, or perception of the environment) that does not meet the criteria for any specific dissociative disorder” (APA, 2000, p.503). In other words, someone with DDNOS has dissociative symptoms but they do not meet sufficient criteria to be diagnosed with either depersonalisation disorder, dissociative amnesia, dissociative fugue or dissociative identity disorder.
Six subsets of DDNOS
There are six subsets of DDNOS listed in the DSM-
- People who appear very similar to dissociative identity disorder but don’t quite meet the full criteria. These are subdivided into two types: a) people where two or more distinct personality states are not fully evident; and b) people who do not have the usual amnesia for important personal information.
- Adults with derealisation but not depersonalisation.
- People suffering dissociative symptoms who have been subject to “periods of prolonged and intense coercive persuasion (eg, brainwashing, thought reform, or indoctrination while captive).”
- Dissociative trance disorder.
- Loss of consciousness, stupor or coma that has not been caused by another medical condition.
- Ganser syndrome.
DDNOS - 'not quite' dissociative identity disorder?
In practice, there seem to be relatively few cases of subtypes 2-
Certainly DDNOS is supposed to be a ‘residual’ category to mop up the ‘few’ cases of dissociative disorders that do not meet the mainstream criteria. But if up to three times as many people receive a diagnosis of DDNOS compared to dissociative identity disorder, it would suggest that the definition of DID is too narrow. This is certainly the view of a number of experts in the field. For example Colin Ross (2007, p.142) says: “The dividing line between DID and most cases of dissociative disorder not otherwise specified is arbitrary. Most cases of DDNOS are partial forms of DID which lack either clear switching of executive control, full amnesia barriers between identity states, or clear differentiation and structure of identity states. They are partial forms of DID with the same patterns of childhood trauma and co-
Similarly James Chu (2011, p.53) writes: “Dissociative disorder not otherwise specified (DDNOS) is a catch-
DDNOS and dissociative identity disorder - a spectrum?
So on the one hand we have a vast swathe of people who are, or would be, diagnosed with DDNOS as opposed to dissociative identity disorder but who show almost all of the symptoms of DID. Many people therefore see DID and DDNOS as appearing on a spectrum, and prefer to conflate the two conditions so that DID/DDNOS represents a range of dissociative experiences with more or less amnesia and greater or less elaboration and distinctive identity states or parts of the personality.
It is also what happens in practice: very few people would realistically distinguish between DID and DDNOS – in PODS we certainly don’t make a distinction and try to ensure that we are addressing the whole range of symptoms and difficulties in living with a dissociative disorder, rather than focusing either exclusively or predominantly on ‘parts’. We see the presence of these dissociative parts of the personality as really important, and of course it is the stand-
The importance of validating DDNOS
At the same time, however, it is important to note that there are differences between someone whose constellation of symptoms would identify them as being at the DID end of the spectrum, and someone whose similar but slightly different set of responses might place them at the DDNOS end of the spectrum. When there is often a strong emphasis on the dissociative parts of the personality, people with DDNOS can feel unheard and unseen, and so in PODS we feel that it is very important to validate the reality of the experience of people with the DDNOS label. We have touched on two major differences already – less elaboration or switching to distinct parts, and less amnesia. But people may be diagnosed as DDNOS as opposed to dissociative identity disorder simply because their ‘parts’ didn’t show up on cue at a diagnostic interview. Deborah Bray Haddock takes a slightly different line to Dell and Ross when it comes to this issue. She says: “My advice to clinicians is that until they have met an alter, it is not DID. They may suspect that someone has DID and their suspicions may prove to be correct, but each of the four criteria must be met to diagnose someone with DID. Until that time, a diagnosis such as dissociative disorder not otherwise specified (DDNOS) might be more appropriate.” (2001, p.9).
This is a complex area of debate, because as Spiegel et al, in their paper Dissociative Disorders in DSM-
It can therefore be very frustrating for some people with the DDNOS label not to have the full diagnosis of dissociative identity disorder and be placed in a seemingly sub-
I don’t have ‘parts’ like other people seem to. I have a sense of myself as being different at different times, feeling younger, or feeling aggressive or withdrawn or panicked, and it’s as if I’m watching myself at times like this. Things come out of my mouth, stuff I’m saying and I don’t know why I’m saying it. I can watch everything that I’m saying and doing, but it’s like I can’t do anything about it and I don’t know what’s going to happen next. These other ‘parts’ of me aren’t clear though – they’re not distinct. They all respond to my name. We feel ‘younger’ at these times, but I couldn’t put an age on it. A lot of people don’t even realise that I’ve changed – I just get told that I’m moody or something like that. But I know it’s more than that. It doesn’t feel like ‘me’, and when I’m like that I can remember things that I don’t remember the rest of the time, although I’m always worried that I’m making it up. But also when I’m like that, I can’t do other things I normally can, like tell the time. I can just stare and stare at my watch and I know I should be able to figure it out but I just can’t. It’s really weird.
Dissociative amnesia: part of the criteria for dissociative identity disorder
Then there is the whole question of amnesia. This seems to me to be a real issue that again the DSM criteria do not sufficiently address. In order to receive a diagnosis for dissociative identity disorder, you must display an “Inability to recall important personal information that is too extensive to be explained by ordinary forgetfulness.” It seems clear to me that this does not specify whether this inability is for current events (“loss of time” as it is usually experienced) or for past events (amnesia, for example for traumatic events). It is strangely vague. And yet in clinical circles, it is often taken to mean amnesia between alters, so that if the ‘apparently normal personality’ (ANP) is fully co-
But an interesting point in this concerns the progress of therapy, which is to re-
DDNOS: a matter of degree?
In terms of other differences, it seems that as a general rule the degree of the trauma or attachment difficulties leading to DDNOS will be less severe than people who are diagnosed with dissociative identity disorder, especially polyfragmented dissociative identity disorder. People with DDNOS may for example have had some ‘good enough’ attachment experiences, or other mitigating factors. On a neurobiological level, differences can be seen in studies measuring the volumes of the hippocampus, a key component of the brain largely associated with memory formation and retrieval. People with DDNOS were reported to have a 13% reduction in hippocampal volume compared to healthy controls, whereas people with DID showed a reduction in the region of 25% (Ehling, Nijenhuis & Krikke, 2003). This has led clinicians such as Elizabeth Howell (2005) to suggest that the degree of dissociation correlates to the degree of severity of the trauma, which may be true. However, this is often little comfort to people with DDNOS, as I shall discuss later.
All of these points present certain issues for people with the DDNOS label. Most strikingly perhaps, people labelled as DDNOS may not feel that their condition is taken as seriously as dissociative identity disorder. Some people with DID may resent the ‘multiple personalities’ connotation, but at times it is the easiest way of explaining it to other people when time is short or openness limited. But how do you describe DDNOS? The temptation might be to describe it in terms of what it is lacking – “It’s sort of DID except not quite” or “It’s like PTSD but with more dissociation.” I wonder how many people with DDNOS therefore feel short-
DDNOS: no place to belong?
And that gives rise to the difficulties that many people with DDNOS have reported, of feeling that they don’t belong anywhere. Some feel uncomfortable being lumped together with people with DID, as so often the conversation or the behaviour can revolve around the autonomy and distinctness of ‘parts’. Some people with DDNOS may prefer the company of people with dissociative identity disorder who keep their parts as much as possible in the background in public situations, but still the lack of distinct ‘parts’ can be felt to be in some way as if they are getting it ‘wrong’. Of course they are not, and their experience is valid exactly because it is their experience. But that can be cold comfort, and it is a basic human need to feel that we ‘fit in’, that we have somewhere to belong. And as the ‘DDNOS’ appellation is so often dropped in favour of ‘DID’ – due not least to its incredibly cumbersome name, which hardly rolls off the tongue! – then people in this range of the spectrum can feel unheard, unvalidated and as if they are the only one suffering with the symptoms they have. That of course is a myth, as the vast majority of people presenting for help with a dissociative disorder, as we have seen, have a diagnosis of DDNOS. But the difficulty remains, especially as there is such a dearth of writing and literature from the perspective of people with DDNOS, who possibly feel that their viewpoint is not worth expressing, again because it is “not proper dissociative identity disorder.”
The structural model of dissociation
Clinicians have also noted difficulties that arise in therapy for people with DDNOS, as opposed to DID. According to Van der Hart et al’s structural model of dissociation (The Haunted Self, 2006), dissociative identity disorder is a case of tertiary dissociation with multiple ANPs and multiple EPs, whereas DDNOS is a case of secondary dissociation with a single ANP and multiple EPs. At one level that is eclectic theory, but in practice it can mean that a person with DDNOS has fewer ‘adult’ parts to help share the load. Where EPs are also less autonomous and less likely to be ‘out’, these traumatised parts of the personality can end up being neglected or ignored: if a person with DDNOS has non-
Another issue, mentioned by a number of people without either distinct parts or amnesia, is that they have less ‘distance’ and ‘protection’ from the traumatic nature of their memories, or the raw emotion of the traumatised parts of themselves. Whilst someone with dissociative identity disorder might be working towards eventually narrowing the gap between their ANPs and EPs, for someone with DDNOS that gap may already be relatively narrow, and paradoxically for many this can lead to more states of crisis as they do not have the well-
Furthermore, where there is a high level of co-
Is there any value in the diagnosis?
All of this therefore begs the question of whether or not it is worth getting a diagnosis, and whether a differential diagnosis between DID and DDNOS has any value. Indeed, Spiegel et al (2011, p.841) point out the inherent flaws in the current diagnostic criteria for dissociative disorders and say: “If the diagnostic criteria for dissociative identity disorder were changed to reflect the typical clinical presentation of DID (ie a complex dissociative presentation with no confirmed alter identities), these complex DDNOS patients would meet diagnostic criteria for DID.” So one option, favoured by many people that I have been in contact with, is to merge the categories and to count the condition as ‘DID/DDNOS’ and leave it at that. Certainly where private therapy is being sought and there is no need for a definitive statement on some official piece of paper or medical record, this may be the preferable option for a large number of people.
But some people do justifiably feel the need for an ‘official diagnosis’ – for a number of reasons, including the pursuit of treatment on the NHS (although a diagnosis of either DID or DDNOS is never a guarantee of appropriate therapy); in order to receive better care from the NHS than the pejorative catch-
But there are a range of difficulties in gaining a diagnosis at all, not least the fact that very few NHS staff are trained to spot dissociative symptoms, let alone administer the ‘gold standard’, the SCID-
They further state: “The ICD-
And even successfully obtaining a diagnosis can cause difficulties – in work situations, in applying for life insurance or even travel insurance, and in the stigma that surrounds so many mental health conditions. Each person needs to weigh up the pros and cons on an individual basis and do what is right for them.
DDNOS and dissociative identity disorder: survival strategies
So what is the solution? I wish ‘the answer’ were easy to find, and equally easy to put into practice. In the harsh reality of the state of awareness of dissociative disorders in the UK today, we have to just keep moving in the right direction and not be dispirited at the challenges that still lay ahead. People with DDNOS need to understand that their experiences are valid and real and not inferior in any way to people with dissociative identity disorder. And whilst recognising the differences, we can also recognise the underlying similarities. In the words of Sue Richardson (2011), “Both DDNOS and DID are the result of the spontaneous action of the brain in response to trauma. Both contain different self-
It may be important for some people with DDNOS to distinguish their experience from that of people with dissociative identity disorder and it would be good for people in this category to come forwards and write about their experience to help people, clinicians in particular, understand the unique characteristics of life with DDNOS. For others, it may be validating to recognise that the distinguishing line between DDNOS and DID is largely arbitrary, and to subsume the diagnosis of dissociative identity disorder into their own self-
© PODS 2013