Well, "personhood" is a bit overrated - what do the words "you" and I" refer to exactly? I'm going to say that, rather than a person, I am a bunch of little components interacting with each other, hence your statement is correct.
The next person isn't sure s/he likes the fact s/he's really a bunch of little components interacting with each other.
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There is nothing that is uniquely and invariably human.