"There is a planet (call it "Yon") where things are very much like here. In particular, by a cosmic accident, some of the people on Yon speak a dialect indistinguishable fron English and live in an urban conglomerate indistinguishable from the Greater Boston Area. Still more, for every one of our Great Bostonians, there is a doppelganger on Yon who has precisely the same neurological structure down to and including micropaticles. We can assume that, so long as we're construing "psychological state" narrowly, this latter condition guarantees type identity of our psychologycal state with theirs
" Fodor, on PutnamÂ´s example of Twin Earth
why is it that good examples apeal to the feel of infancy? It may be right what someone once told me, all you need to do to recognize a great mind is to find that such mind works acordingly to the following parameters: i) he must have written a book, or story, with a great title, ii) he must have amazingly clear examples, iii) he can convince you that there are many ways of fighting his view but that that's not necessary for he is right.