If most of the perceived trauma for the autistic child was coming from outside of the family (medical interventions, school etc) and that child has at least one place and one person they feel safe with there is surely going to be a difference (aside from the autism) in the 'development of self'? ..to the child that feels they are not even safe in their own home? In each case though for different reasons the full process does not complete.
About that, if the child really feel safe at home but has gone through enough traumas outside, I think it would lead to the same kind of DID I've read about in some case studies (people are supposed to be NT).
I don't remember where I read about those two, but I will try to find them again.
One was about a child in foster care, in a very kind and safe family, who suddenly had to visit her birth (and abusive) mom at the age of 4 (if I remember well). It was ordered by court, her foster mom didn't find a way to protect her from her birth mom, and the child ended up with one alter created to deal with visiting her birth mom. That alter behaved differently than the other alter (the one made to deal with the rest of the life), and couldn't recognize/didn't remember her foster parents if they checked on her out of the blue.
Another one was about a child who had medical trauma and felt that their parents weren't able to protect him from it. He had one ANP going on with normal life and totally amnesic of the trauma and didn't know they had other parts, and two EPs. One EP was really angry about what happened.
I can imagine that, with more difficulties surrounding their sense of self, someone with autism/ADHD would have more than a few alters to deal with that.
Anyway, I can't wait for Reuben to publish her paper, I hope there will be some answers!
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French person with ADHD
Functional multiplicity, former partial DID