There is no "I" in "You"

[Ben Davis]

Can anyone answer why you're you.....and not me?

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By what method of determination do I experience existence separate from your experience; more to the point, what determined both our particular experiences and could one have been shunt in place of another (by what alternate means could I have experienced existence through your perspective or vice versa)?

Why here, why now...why not exist a thousand years from now or a thousand years past?

Can this ever be coherently approached or determined materialistically/scientifically? Or, is metaphysics a fundamental necessity?

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Late to the party again. My sig sums it up nicely, cutting through any Descartesian uncertainty:

Sum ergo sum, I am therefore I am. The facts of my existence are the evidence and explanation of my existence. My identity and 'conscious', self-referential faculties are emergent properties of my physical existence, the qualia of my brain functions.

All robust evidence demonstrates this and though the experrts don't have a full picture of how 'I' arise from my brain (far from it!), I clearly do because I'm here and there are no other mechanisms working that could produce such an effect.