Has Anyone Spoken About Personal Identity in This Way? Okay, so my take on your question is: the universe is too full of information and relationships for us to understand, to represent in our minds. So we know something when we learn to take some links into consideration and ignore all the rest.Knowing and defining is not so much about taking in, but about leaving out. With this in mind, thinking about a person is necessarily reductionistic, because you are building "a mental wall" around some phenomena to think of them as separate from others and become super-aware of what they have in common. It´s all a mental trick, it´s not realistic. But it is very convenient, because it allows us to focus our energy, to guide our behaviour. A person is really in my view, the symbolic avatar that our tens of trillions of cells, bacteria, protozoids etc use to communicate with other pluricellular colonies with similar interests, that have their own personae ("masks") or avatars to chat with our avatar. A person is an entity of the level of reality, or complexity, that is also inhabitated by dogs or blackbirds or vacuum cleaners; but not by bacteria or the Moon. The Moon communicates with entities in her level in their particular way, basically through gravity and radiation. Bacteria communicate with other bacteria with their chemical and electrical signs. Personae themselves are symbolical creatures (they are avatars or images) so they communicate with each other using symbols and meanings. Our personal or symbolic or "spiritual" self, is an ongoing update on past records of the states the colony have been going through so far; not direct medical and physical descriptions, but the symbolic or poetic record that was made for the persona files.
The purpose of the avatar is to deal with the macrocosmos level of the cellular system in a way that is conducive to the survival of the colony and the survival of other similar colonies. If the avatar had not other avatars to communicate and work with, it would lose its purpose; that is why lonely ladies adopt cats and why saints in the desert had so many imaginary friends. If you upload your mind into a computer before you die, your persona or soul dies with the body anyway, and the upload is just a record of the last state of the symbolic function of that poor body. It can be used to make a digital creature, that I guess will seek desperately for a body to be attached to, so as to avoid extinction or dilution. But it´s not you, so you don´t need to care about that program and its troubles.