Alex Byrne

Cohen begins by defining ‘Color Physicalism’ so that the position is incompatible with Color Relationalism (unlike Byrne and Hilbert 2003, 7, and note 18). Physicalism, in any event, is something of a distraction, since Cohen’s argument from perceptual variation is directed against any view on which minor color misperception is common (Byrne and Hilbert 2004). A typical color primitivist, for example, is equally vulnerable to the argument. Suppose that normal human observers S1 and S2 are viewing a chip C, as in Cohen’s example. C looks unique green to S1, and bluish green to S2. The problem, as Cohen has it, is to explain “what could (metaphysically) make it the case” that S1, say, and not S2, is perceiving C correctly. He purports to find the explanation “extremely hard to imagine”, and so concludes that both S1 and S2 are perceiving C correctly. (That is not the only option, of course: Hardin concludes that neither is perceiving the chip correctly.).

Eleven distinguished philosophers have contributed specially written essays on a set of topics much debated in recent years, including physicalism, qualia, semantic competence, conditionals, presuppositions, two-dimensional semantics, and the relation between logic and metaphysics. All these topics are prominent in the work of Robert Stalnaker, a major presence in contemporary philosophy, in honor of whom the volume is published. It also contains a substantial new essay in which Stalnaker replies to his critics, and sets out his current views on the topics discussed.

In the preface, Kim writes hopefully that his introduction to the philosophy of mind is “intended to be accessible to those without a formal background in philosophy”. The blurb at the end is more realistic: Philosophy of Mind is “a textbook for upper-level undergraduates and graduate students”. It is an admirable addition to Westview’s excellent Dimensions of Philosophy series. Brisk, workmanlike chapters profile the usual suspects: behaviorism, the identity theory, mind as computer and as causal structure, mental causation, consciousness, mental content, and reductive and nonreductive physicalism. Each chapter ends with a useful note on further readings.

The diversity of topics discussed in this book reflects the breadth of Judith Jarvis Thomson's philosophical work. Throughout her long career at MIT, Thomson's straightforward approach and emphasis on problem-solving have shaped philosophy in significant ways. Some of the book's contributions discuss specific moral and political issues such as abortion, self-defense, the rights and obligations of prospective fathers, and political campaign finance. Other contributions concern the foundations of moral theory, focusing on hedonism, virtue ethics, the nature of nonconsequentialism, and the objectivity of moral claims. Finally, contributions in metaphysics and epistemology discuss the existence of sets, the structures reflected in conditional statements, and the commitments of testimony. Contributors: Jonathan Bennett, Richard L. Cartwright, Joshua Cohen, N. Ann Davis, Catherine Z. Elgin, Gilbert Harman, Barbara Herman, Frances Myrna Kamm, Claudia Mills, T.M. Scanlon, Ernest Sosa

Our reply is in four parts. The first part addresses objections to our claim that there might be "unknowable" color facts. The second part discusses the use we make of opponent process theory. The third part examines the question of whether colors are causes. The fourth part takes up some issues concerning the content of visual experience. Our target article had three aims: (a) to explain clearly the structure of the debate about color realism; (b) to introduce an interdisciplinary audience to the way philosophers have thought about the issue; (c) to argue that colors are certain sorts of physical properties ("productances"). We are very grateful to the commentators in this continuing commentary for their criticism and constructive suggestions.

G&S describe the radical neuron doctrine in a number of slightly different ways, and we think this hides an important distinction. On the one hand, the radical neuron doctrine is supposed to have the consequence "that a successful theory of the mind will make no reference to anything like the concepts of linguistics or the psychological sciences as we currently understand them", and so Chomskyan linguistics "is doomed from the beginning" (sect. 2.2.2, paras. 2,3).[1] (Note that `a successful theory' must be read as `any successful theory', else the inference will fail.) On the other hand, the radical neuron doctrine is said to be the claim "that emergent psychological properties can be explained by low-level neurobiological properties" (sect. 2.3, para. 3). It is clear from the context that this can be more faithfully rendered as: psychological phenomena can be explained in (solely) neurobiological terms. But this formulation of the doctrine does not have the consequence just mentioned