The idea of an ANP and an EP, kept determinedly, even phobically, apart, make such sense of my experience - when I am stable, being in any other state seems impossibly unlikely, and when I am distressed recovering from that distress by any but self -destructive means seems incredible. It makes sense of why I walk into therapy and can't really recall any bad bits of the week to report, even though I know it has been up and down. If at that moment I'm functioning as ANP, then I wouldn't want to know about the EP bits.
This sounds really familiar! I can really related to just sort of keeping a dry mental outline of difficult periods but not staying in them really, so the details can take real will to retrieve -- or just be missing. The phobic thing makes sense...
As an aside... I think that some of the really recent Dutch trauma research uses the phrases"less than distinct parts" and "distinct parts" instead of "ANP" and "EP".
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The Internal Family Systems (IFS) model can be used for both dissociated parts and "normal" aspects of personality -- everyone has those latter things, including people with dissociative disorders, I think. People can mostly all relate to, say, a "work persona" and a "with your buddies" persona.
However I find the Structural Dissociation (SD) model much better for specifically explaining some issues I have that were related to abuse. The IFS "roles" for parts seem less explanatory to me since I can apply them in different ways, IFS seems like storytelling to me (helpful but not explanatory) whereas SD feels like the engineering and things fell into place for me too when I read it the first time.
Maybe the phobic boundaries between parts in SD is the difference from "normal" parts in non-SD people? There is some physical evidence that unprocessed traumatic memories are stored physically differently in the brain than normal memories; the unprocessed traumatic memories would be held by EPs or less than distinct parts in SD.