I am sorry for my previous post. It was very abrupt and not very helpful. Certain parts of me have a lot of trouble with dissociation and this board in particular, including me, especially posting on it, and they wrote that post. I am temporarily suspending our collective disbelief to write this. So I am going to write to you what other parts were telling me to write last time but that I didn't write then (they were NOT happy with what ended up being written) and what I have learned since then.
First off, the way I've understood it is that ego states are less defined than dissociative states that arise in DD-NOS or in DID. I would suggest you read parts of this GoogleBook: Dissociation and the Dissociative Disorders: DSM-V and Beyond, specifically page 417, chapter 25, and the criteria he outlines for Complex Dissociative Disorder on pages 397 and 398.
http://books.google.com/books?id=e-6WHeIf-dgC&pg=PA381&source=gbs_toc_r&cad=4#v=onepage&q&f=false The entire book is not available there, but I think it outlines a lot that is useful - specifically the difference between ego states and dissociative states and some signs of dissociation. Una previously wrote about this book on this board, and I got it from a post from her.
To summarise Paul Dell's theory, as you move along the spectrum of dissociation (which he names as normal, non-dissociative mental illness, DD-NOS, DID), the ego states become more and more defined. I still don't think that it matters too much where you are on this spectrum, as I think treatment would be the same. The difference between normal and dissociated states (I am not sure about ego states), though, seems to be the continuity of the parts. I think that if you can define them consistently (e.g., likes, dislikes, etc.)and identify some triggers for them, this is dissociated.
Second, given that you have a T, you may investigate the Multidimensional Inventory of Dissociation (MID), which is a self-report inventory of dissociative symptoms created by Paul Dell. It defines where you are on his spectrum of dissociation as well as PTSD symptoms. In some circles, it seems as if it is used as a substitute for the SCID-D because it is more user-friendly but also because it is better than the DES (if you know what that is). The SCID-D is an interview (basically a bunch of questions) that is the gold standard for assessing dissociation, but it also takes a lot of training to use. The MID is also in the public domain, I am told, and it seems that little training is required to use it or interpret it. I think you could use it yourself if you wanted, but I think that bringing it up with your therapist is a better idea. I found it difficult to answer because parts of me were arguing a lot during it, some of which did not experience the symptoms at all.
Third, you gave me a link on my thread, which I am supposed to send back to you.
http://www.psychforums.com/dissociative-identity/topic98598-50.html#p1021211 I am also to tell you that the voices may not need to speak to you, and that may be why you are not hearing them right now. Mine only talk to me when there is something important to be known in order to facilitate the working of the system.
Fourth, my question about memory was bad last time. It's often hard to know if your memory is not intact, especially at this end of the spectrum where it is more subtle. Here are some more appropriate questions, I think. Have you ever felt surprised when it is inappropriate? E.g., I am surprised to see that my apartment is clean because I last remember it being messy, even though I also remember cleaning it after that. Or has someone ever asked you a question that you answer one way at one time and later you remember that however you answered it was patently untrue, even though at the time you thought it was the truth? Or you ask someone to call you by a nickname and then they do and you are surprised when they do? Or like, why did I buy this??? I am not actually sure how much of this is different from normal people, but these are things I experience that seem influenced by others.
Last, if you are interested, I can write more about my experience, but I don't want this post to go on too much longer, and if you're not interested, I don't want to take up space on your post. I hope that you find this post more helpful.