The question of whether "you" would continue in multiple parallel brain vats raises issues that come perilously close to the theological notion of souls, but I see no simple way out of the conundrum. Perhaps we need to remain open to the Upanishadic doctrine that the ordinary rules of numerosity and arithmetic, of "one vs. many", or indeed of two-valued, binary yes/no logic, simply doesn't apply to minds — the very notion of a separate "you " or "I" is an illusion, like the passage of time itself.

We are all merely many reflections in a hall of mirrors of a single cosmic reality (Brahman or "paramatman"). If you find all this too much to swallow just consider the that as you grow older and memories start to fade you may have less in common with, and be less "informationally coupled", to your own youthful self, the chap you once were, than with someone who is now your close personal friend. This is especially true if you consider the barrier-dissolving nature of mirror neurons. There is certain grandeur in this view of life, this enlarged conception of reality, for it is the closest that we humans can come to taking a sip from the well of immortality. (But I fear my colleague Richard Dawkins may suspect me of spiritual leanings of "letting God in through the back door" for saying this.)