I argue that Descartes's best known argument for dualism relies on claims about intellectual activity and not on claims about mental states generally to establish dualism. I explain that this must be so give his historical context, where arguments for the immateriality of the mind on the basis of the intellect were common. But sensation and other non-intellectual states were regarded as pertaining to the body-soul composite.

I am interested in what main differences there are between Homo sapiens and other known terrestrial species, or (for short) between man and beast. We have a sense that we differ vastly from all the rest in some respect that is mental rather than grossly physical, but we are not agreed on what respect it is. This is my topic today. I shall bring in some work done in recent years by ethologists and animal psychologists. It is relevant less because (...) it provides news about the beasts than because it spurs our thinking about what we already think or intuit about the beasts and how they differ from us. That is really my topic: although we don’t agree in what we say about what mainly differentiates us from the other animals, I think we have the same picture of the difference, the same sense of what it is; and I want to know whether that shared picture, or intuition, can be parlayed into an agreed description. One proper study of humankind is ourselves; that includes our thoughts, which include our thoughts about what makes us special. I shall go on talking as though the question were: What is the difference? But really it is: What difference do we already think is there? Or, anyway: What difference can be known to obtain between us and them, on the basis of what we already know about us and about them? I am interested in differences of kind rather than of degree. If the final story is merely that we are more intelligent than the beasts are, that means that our common picture of how we relate to them is false. Mortimer Adler, in his book The Difference of Man and the Difference it Makes argues for a fundamental intellectual difference of kind between humans and other animals. Having identified me in that book as an ally, on the strength of my book Rationality, he wrote to me about the matter. During the correspondence that followed, I wrote that while I agreed with his conclusion, I didn’t hold it with such passion as he did, perhaps because I was sure that the difference between kind and degree is itself a difference of degree.. (shrink)

I propose to consider the question, "Can machines think?" This should begin with definitions of the meaning of the terms "machine" and "think." The definitions might be framed so as to reflect so far as possible the normal use of the words, but this attitude is dangerous, If the meaning of the words "machine" and "think" are to be found by examining how they are commonly used it is difficult to escape the conclusion that the meaning and the answer to (...) the question, "Can machines think?" is to be sought in a statistical survey such as a Gallup poll. But this is absurd. Instead of attempting such a definition I shall replace the question by another, which is closely related to it and is expressed in relatively unambiguous words. The new form of the problem can be described in terms of a game which we call the 'imitation game." It is played with three people, a man (A), a woman (B), and an interrogator (C) who may be of either sex. The interrogator stays in a room apart front the other two. The object of the game for the interrogator is to determine which of the other two is the man and which is the woman. He knows them by labels X and Y, and at the end of the game he says either "X is A and Y is B" or "X is B and Y is A." The interrogator is allowed to put questions to A and B. We now ask the question, "What will happen when a machine takes the part of A in this game?" Will the interrogator decide wrongly as often when the game is played like this as he does when the game is played between a man and a woman? These questions replace our original, "Can machines think?". (shrink)

In her first book, Marleen Rozemond explicates Descartes's aim to provide a metaphysics that would accommodate mechanistic science and supplant scholasticism.

ne of the leading problems for Cartesian dualism is to provide an account of the union of mind and body. This problem is often construed to be one of explaining how thinking things and extended things can causally interact. That is, it needs to be explained how thoughts in the mind can produce motions in the body and how motions in the body can produce sensations, appetites, and emotions in the mind. The conclusion often drawn, as it was by three (...) of Descartes's illustrious successors, Malebranche, Spinoza, and Leibniz, is that mind and body cannot causally interact.' I mention this problem of the interaction between thinking things and extended things only to distinguish it from the problem concerning the union of mind and body which I wish to discuss. Some commentators, such as Daisie Radner, maintain that the.. (shrink)