Some alternates communicate autonomously with each other.
There are memory boundaries between alternates but over time these boundaries become ever more permeable.
“Dissociative identities exist in a third reality, an inner world that is visualized, heard, felt and experienced as real. This third reality is often characterized by trance logic. In trance logic, ideas and relationships of ideas about things are not subject to the rules of normal logic. Because (the alternates) are kept in separate compartments (of the brain), contradictory beliefs and ideas can exist together; they do not have to make sense. In the way, the internal world has many alternate selves that experience themselves as separate people. There is a pseudo delusional sense of separateness and independence.”
From Trauma and Dissociation
I don’t experience the inner world of my dissociative system as vividly
as the alternates that use Second Life do.