Alex Byrne

Somewhat at random, I shall pick chapter 7 for a closer look. Tye distinguishes three versions of the view that colors are “mind-independent, illumination-independent properties”, which we frequently see physical objects as possessing. The first is emergentism, according to which colors are “simple qualities” that nomologically supervene on the physical facts: there is a possible world exactly like the actual world physically, but in which nothing is colored. Brute nonreductive physicalism is the same as emergentism, except that colors are said to metaphysically supervene on the physical facts. Hence, on this second view, there is no physical duplicate of the actual world in which nothing is colored. The third position, reductive physicalism, simply identifies colors with physical properties.

Traditionally, perceptual experiences—for example, the experience of seeing a cat—were thought to have two quite distinct components. When one sees a cat, one’s experience is “about” the cat: this is the representational or intentional component of the experience. One’s experience also has phenomenal character: this is the sensational component of the experience. Although the intentional and sensational components at least typically go together, in principle they might come apart: the intentional component could be present without the sensational component or vice versa.

Perceptual experiences justify beliefs—that much seems obvious. As Brewer puts it, “sense experiential states provide reasons for empirical beliefs” (this volume, xx). In Mind and World McDowell argues that we can get from this apparent platitude to the controversial claim that perceptual experiences have conceptual content: [W]e can coherently credit experiences with rational relations to judgement and belief, but only if we take it that spontaneity is already implicated in receptivity; that is, only if we take it that experiences have conceptual content. (1994, 162) Brewer agrees. Their view is sometimes called conceptualism; nonconceptualism is the rival position, that experiences have nonconceptual content. One initial obstacle is understanding what the issue is. What is conceptual content, and how is it different from nonconceptual content? Section 1 of this paper explains two versions of each of the rival positions: state (non)conceptualism and content (non)conceptualism; the latter pair is the locus of the relevant dispute. Two prominent arguments for content nonconceptualism—the richness argument and the continuity argument—both fail (section 2). McDowell’s and Brewer’s epistemological defenses of content conceptualism are also faulty (section 3). Section 4 gives a more simple-minded case for conceptualism; finally, some reasons are given for rejecting the claim—on one natural interpretation—that experiences justify beliefs

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.

I know various contingent truths about my environment by perception. For example, by looking, I know that there is a computer before me; by hearing, I know that someone is talking in the corridor; by tasting, I know that the coffee has no sugar. I know these things because I have some built-in mechanisms specialized for detecting the state of my environment. One of these mechanisms, for instance, is presently transducing electromagnetic radiation (in a narrow band of wavelengths) coming from the computer and the desk on which it sits. How that mechanism works is a complicated story—to put it mildly—and of course much remains unknown. But we can at least produce more-or- less plausible sketches of how the mechanism can start from retinal irradiation, and go on to deliver knowledge of my surroundings. Moreover, in the sort of world we inhabit, specialized detection mechanisms that are causally affected by the things they detect have no serious competition—seeing the computer by seeing an idea of the computer in the divine mind, for example, is not a feasible alternative.

Emergentists such as Samuel Alexander and C. Lloyd Morgan held that the mental is causally efficacious, supervenes on the physical, but does so mysteriously. We must accept the emergent mind, in Alexander's phrase, with "natural piety". Emergentism emerged late last century and all but disappeared in the twentieth. This dissertation attempts to revive the position. ;To explain psycho-physical supervenience is to provide a proof of the mental facts from the physical facts, such that mental vocabulary only occurs in the proof in the form of a priori bridge principles connecting mental goings on with the physical facts. Offering a proof of the mental facts from the physical facts would be one way to justify supervenience, thus simultaneously vindicating and explaining it. ;Those philosophers who try to "naturalize intentionality" can be seen as seeking such proofs for intentional states. Various theories of this kind are considered: those of Fodor, Millikan, Lewis, and others. It is argued in chapters 2 and 3 that these theories are either false or unknowable. ;The case for eliminativism is examined in chapter 4, where it is argued that eliminativism is, of necessity, not a rational thesis to adopt. ;A view found in the writings of Davidson and Dennett is the topic of chapter 5. This is a kind of third-person Cartesianism: a person's mind is completely revealed by the deliverances of a suitably equipped interpreter. This position would elegantly vindicate supervenience without explaining it, at the price of a kind of anti-realism about the mind. It is argued that the price is not worth paying. ;In the sixth chapter it is argued that if the phenomenal aspects of the mind supervene, they do so mysteriously. An argument is then presented for psycho-physical supervenience. It was argued earlier that if supervenience holds for intentional states, it cannot be adequately explained. Therefore physicalism is true, but the mind-body problem has no solution