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: He begins this 1989 book by stating, "The question of whether a mechanical device would ever be said to think---perhaps even to experience feelings, or to have a mind---is not really a new one. But it has been given a new impetus, even an urgency, by the advent of modern computer technology. The question touches upon deep issues of philosophy. What does it mean to think or to feel? What is a mind? Do minds really exist?... might minds equally well be associated with pieces of electronic equipment? Are minds subject to the laws of physics? ... These are among the issues I shall be attempting to address in this book... I should make clear that my view is an unconventional one among physicists and is consequently one which is unlikely to be adopted, at present, by computer scientists or physiologists... Nevertheless, I shall argue that there is another vast unknown in our physical understanding at JUST such a level as could indeed be relevant to the operation of human thought and consciousness..."