by Quinn O'Neill
As an atheist, I sometimes get asked if I’m afraid of what'll happen when I die. Naturally, I'm not afraid of going to Hell or any other supernatural place and I'm not afraid of being dead, but admittedly, there is something that scares me. I'm afraid that I could someday exist in (or as) another body.
My position is not so much that we can exist in more than one body but that we don’t know that we can’t, or even how probable it would be. To be clear, I'm not suggesting any kind of dualism or that we might be reincarnated with our current attributes and personality traits. Consistent with a naturalistic view of the world, I accept that consciousness and perception of self are generated by the brain, so when the brain dies there's nothing left – no thoughts, no personality, and no spirit. The chance of an identical physical copy of my brain arising again is very small, so perhaps I needn't worry.
But it’s here that the worry creeps in. Is an identical physical copy of my brain what it would take for me to experience being alive again? In order to establish that subjective consciousness is restricted to a single body, we'd have to understand how it works and we really don't.
From a naturalistic perspective, the brain is what makes us who we are. Presumably, if we could create perfect physical copies of ourselves right down to the wiring of our brains and the neural connections that store our memories, we could effectively recreate ourselves. But there’s a problem, because even if I could perfectly replicate myself and make a thousand copies, I would perceive only one of these as “self”. In other words, whatever makes me uniquely me is not something that I could even in theory share with an identical physical copy. The only thing that could distinguish me from such copies is position. Only the location of my perspective would be unique.
This is a bit of a conundrum. To an objective observer encountering me and one of my copies, there’d be two identical copies of me, each thinking itself the original. From my point of view, however, there’d be a big difference between the copies – I’d be one of them and the other would be someone else.
