This month’s Asimov’s Science Fiction Magazine has a long interview I did with AI pioneer Ray Kurzweil, who invented optical character recognition, cured his own diabetes, and is now planning to live forever. The good folks at Asimov’s were good enough to put the full text of the interview online, too.
So how do you know if the backed-up you that you’ve restored into a new body-or a jar with a speaker attached to it-is really you? Well, you can ask it some questions, and if it answers the same way that you do, you’re talking to a faithful copy of yourself.
Sounds good. But the me who sent his first story into Asimov’s seventeen years ago couldn’t answer the question, “Write a story for Asimov’s” the same way the me of today could. Does that mean I’m not me anymore?
Kurzweil has the answer.
“If you follow that logic, then if you were to take me ten years ago, I could not pass for myself in a Ray Kurzweil Turing Test. But once the requisite uploading technology becomes available a few decades hence, you could make a perfect-enough copy of me, and it would pass the Ray Kurzweil Turing Test. The copy doesn’t have to match the quantum state of my every neuron, either: if you meet me the next day, I’d pass the Ray Kurzweil Turing Test. Nevertheless, none of the quantum states in my brain would be the same. There are quite a few changes that each of us undergo from day to day, we don’t examine the assumption that we are the same person closely.
(Disclaimer: Yeah, I got the Heinlein title wrong: it’s The Moon is a Harsh Mistress, not The Man Who Sold the Moon — d’oh!)