Compartmentalisation is usually found in multiple personalities; but to answer your question, it can form at any stage during life. In relation to someone with MPD, a different personality will access individual compartments of the brain, in which makes their multiple personalities. Whilst you don't have to have MPD to do this, accessing each compartment as such can usually be done with hypnotherapy or EMDR, though both pose the risk of bringing back too much at once.
Even without this, the brain can gain access to individual parts simply by provoking a trauma itself, being your accident. For example, if you wrote a detailed analysis of what you remember, then read it over and over, that can trigger your brain to access the other memories that have been stored elsewhere. This is usually the first method tried, and if continually fails, then hypnotherapy or EMDR are often suggested to find those memories again. The brain forgets nothing, every image and word we hear goes in, stays in, its just a matter of finding it within the brain itself.
Don't feel cheeky daisy, there is no time limit on anything here. Your here, so ask again. You would have already notices, where not shy in just asking straight up, because it gets things out that we may want to know from you. It goes both ways. Pick our brains as hard and fast as you want Daisy, because we are going to do the same with you basically. That is what this community is about, nothing to hide, share what we know, help one another as much as possible.  | 
PTSD Forum recommends the use of Firefox Browser with Search Status add-on, plus your countries relevant English dictionary add-on. This enables forum members to spell check and remove typical toolbars from their browser.
Gender 
Linear Mode
