[Interviewer:] The well-known University College London linguist Neil Smith argued in his book Chomsky: Ideas and Ideals (Cambridge University Press, 1999) that you put to rest the mind-body problem not by showing that we have a limited understanding of the mind but that we cannot define what the body is. What can he possibly mean by this?
[Chomsky:] I wasn’t the person who put it to rest. Far from it. Isaac Newton did. Early modern science, from Galileo and his contemporaries, was based on the principle that the world is a machine, a much more complex version of the remarkable automata then being constructed by skilled craftsmen, which excited the scientific imagination of the day, much as computers and information processing do today. The great scientists of the time, including Newton, accepted this “mechanical philosophy” (meaning the science of mechanics) as the foundation of their enterprise. Descartes believed he had pretty much established the mechanical philosophy, including all the phenomena of body, though he recognized that some phenomena lay beyond its reach, including, crucially, the “creative aspect of language use” described above. He therefore, plausibly, postulated a new principle—in the metaphysics of the day, a new substance, res cogitans, “thinking substance, mind.” His followers devised experimental techniques to try to determine whether other creatures had this property, and like Descartes, were concerned to discover how the two substances interacted.
Newton demolished the picture. He demonstrated that the Cartesian account of body was incorrect and, furthermore, that there could be no mechanical account of the physical world: the world is not a machine. Newton regarded this conclusion as so “absurd” that no one of sound scientific understanding could possibly entertain it—though it was true. Accordingly, Newton demolished the concept of body (material, physical, and so on), in the form that it was then understood, and there really is nothing to replace it, beyond “whatever we more or less understand.” The Cartesian concept of mind remained unaffected. It has become conventional to say that we have rid ourselves of the mysticism of “the ghost in the machine.” Quite the contrary: Newton exorcised the machine while leaving the ghost intact, a consequence understood very well by the great philosophers of the period, like John Locke.
Locke went on to speculate (in the accepted theological idiom) that just as God had added to matter properties of attraction and repulsion that are inconceivable to us (as demonstrated by “the judicious Mr. Newton”), so he might have “superadded” to matter the capacity of thought. The suggestion (known as “Locke’s suggestion”) in the history of philosophy was pursued extensively in the eighteenth century, particularly by philosopher and chemist Joseph Priestley, adopted by Darwin, and rediscovered (apparently without awareness of the earlier origins) in contemporary neuroscience and philosophy.
There is much more to say about these matters, but that, in essence, is what Smith was referring to. Newton eliminated the mind-body problem in its classic Cartesian form (it is not clear that there is any other coherent version), by eliminating body, leaving mind intact. (191–192)