I found the things I've been looking at, even a book about it. The case studies are in the field of Neuroscience complete with MRI images of dfferent brain activity in switches.

Neurobiology and Treatment of Traumatic Dissociation: Towards an Embodied Self
By Ulrich F. Lanius PhD, Sandra L. Paulsen PhD, Frank M. Corrigan MD

https://books.google.com/books?id=0i...iative&f=false

Basically, it says when a caregiver relationship can't be established, the resulting trauma affects the child to switch smoothly through affective states.

"When affective states cannot integrate appropriately in the stabilization effect of the mother-child relationship, the hard wired subcortical affective circuit cannot integrate appropriately in the context of secondary brain processing related to relationship templates.....this results in a lack of integration across states through maladaptive state-dependent learning and disruptive affective circuits....failure to acquire smooth state shifting and resultant acquisition of habits of state switching instead is a foundation for subsequent development of affect dysregulation and dissocative disorders..."

Stuff like that.

It's a more complicated way of saying trauma causes dissociative disorders.