"I would argue that inside your mind was some pattern of neurological activity that was not there before you exchanged e-mail with me. The Root Representation. It is not me . I’m this big slug of carbon and oxygen and some other stuff on this cot right next to you. The Root Rep, by contrast, is the thing that you’ll carry around in your brain for the rest of your life, barring some kind of major neurological insult, that your mind uses to represent me. When you think about me, in other words, you’re not thinking about me qua this big slug of carbon, you are thinking about the Root Rep. Indeed, some day you might get released from jail and run into someone who would say, ‘You know, I was in the Philippines once, running around in the boondocks, and I ran into this old fart who started talking to me about Root Reps.’ And by exchanging notes (as it were) with this fellow you would be able to establish beyond a reasonable doubt that the Root Rep in your brain and the Root Rep in his brain were generated by the same actual slug of carbon and oxygen and so on: me."