Suppose then that we will come to understand the objective correlatives to consciousness in terms of physics (including chemistry) and that we will also understand how they evolved to be what they are. It is not unreasonable to hope that when the objective correlatives to consciousness have been explained, somewhere in our explanations we shall be able to recognize something, some physical system for processing information, that corresponds to our experience of consciousness itself, to what Gilbert Ryle has called “the ghost in the machine.” That may not be an explanation of consciousness, but
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