How does "soul exchange" work?

[Westleigh]

This is not a phenomenon I've come across before, and I would like to understand it.

The way I understand it, the relationship between our higher self (soul) and our conscious minds is a little like the relationship of a driver to a car. Logically, I can understand the idea of one driver getting out and another getting in. I also understand the idea of soul merging and have experienced that.

I suppose what I'm struggling with is the fact that if our soul leaves the body completely and is replaced by another, then everything that lies behind the conscious thoughts of that body alters, and they are now a completely different person. Only a completely different person using the same brain to think with. The soul that initially inhabited the body has presumably "died" and moved back to the spirit world. I've always imagined a soul is irrevocably tied to a body for the duration of its existence, so trying to imagine how the conscious human mind perceives this change or assimilates it is quite mind-boggling and I can't quite get my head around it, nor can I imagine the ramifications this would have on the person's life and relationships.

I suppose I just want to ask: what does this mean, and how big an emotional and physical effect does it have?