David Rosenthal

Moore’s paradox occurs with sentences, such as (1) It’s raining and I don’t think it’s raining. which are self-defeating in a way that prevents one from making an asser- tion with them.1 But Mark Crimmins has given us a case of a sentence that is syntactically just like (1) but is nonetheless assertible. Suppose I know somebody, and know or have excellent reason to believe that I know that very person under some other guise. I do not know what that other guise is, though I do know that I believe that the person I know under that other guise is an idiot.

I begin by considering Ned Block's widely accepted distinction between phenomenal and access consciousness. I argue that on Block's official characterization a mental state's being access conscious is not a way the state's being conscious in any intuitive sense; that if phenomenal consciousness itself corresponds to an intuitive way of a state's being conscious, it literally implies access consciousness; and that Block misconstrues the theoretical significance of the commonsense distinction. These considerations point to the view that mental states' being conscious consists in their being accompanied by occurrent, assertoric thoughts to the effect that one is in the state in question: what I have elsewhere called higher- order thoughts (HOTs). After outlining the model, I sketch theoretical advantages having to do with introspective consciousness, the relationship between consciousness and speech, and the metacognitive phenomenon known as feeling-of-knowing judgments. I conclude by showing that the HOT model does justice to phenomenal consciousness: Sensory states are not all conscious, and HOTS explain why there is something it is like to be in those which are.

Consciousness and Mind presents David Rosenthal's influential work on the nature of consciousness. Central to that work is Rosenthal's higher-order-thought theory of consciousness, according to which a sensation, thought, or other mental state is conscious if one has a higher-order thought that one is in that state. The first four essays develop various aspects of that theory. The next three essays present Rosenthal's homomorphism theory of mental qualities and qualitative consciousness, and show how that theory fits with and helps sustain the HOT theory. A crucial feature of homomorphism theory is that it individuates and taxonomizes mental qualities independently of the way we're conscious of them, and indeed independently of our being conscious of them at all. So the theory accommodates the qualitative character not only of conscious sensations and perceptions, but also of those which fall outside our stream of consciousness. Rosenthal argues that, because this account of mental qualities makes no appeal to consciousness, it enables us to dispel such traditional quandaries as the alleged conceivability of undetectable quality inversion, and to disarm various apparent obstacles to explaining qualitative consciousness and understanding its nature. Six further essays build on the HOT theory to explain various important features of consciousness, among them the complex connections that hold in humans between consciousness and speech, the self-interpretative aspect of consciousness, and the compelling sense we have that consciousness is unified. Two of the essays, one an extended treatment of homomorphism theory, appear here for the first time. There is also a substantive introduction, which draws out the connections between the essays and highlights their implications.

Edited in hypertext by Andrew Chrucky. Reprinted with the permission of Professor David Rosenthal. Editor's Note: Due to the limitation of current hypertext, the following conventions have been used. In general, if an expression has some mark over it, that mark is placed as a prefix to the expression. All Greek characters are rendered by their names. Subscripts are placed in parentheses as concatenated suffixes: thus, e.g., HO is the chemical formula for water. Sellars' dot quotes are expressed by bold periods

At the level of our platitudinous background knowledge about things, speech is the expression of thought. And understanding what such expressing involves is central to understanding the relation between thinking and speaking. Part of what it is for a speech act to express a mental state is that the speech act accurately captures the mental state and can convey to others what mental state it is. And for this to occur, the speech act at least must have propositional content that somehow reflects that of the mental state, and perhaps must have other such properties as well

Strawson’s challenging and provocative defence of panpsychism1 begins by sensibly insisting that physicalism, properly understood, must unflinchingly countenance the occurrence of conscious experiences. No view, he urges, will count as ‘real physicalism’ (p. 4) if it seeks to get around or soften that commitment, as versions of socalled physicalism sometimes do. Real physicalism (hereinafter physicalism tout court) must accordingly reject any stark opposition of mental and physical, which is not only invoked by many followers of Descartes, but even countenanced by many recent physicalists. Conscious experiences, Strawson persuasively urges, are a special case of the physical, just as cows are animals. Panpsychism enters the picture because, despite the physical nature of conscious experiences, Strawson maintains that we cannot describe or explain the experiential using the terms of physics or neurophysiology. Since the experiential is nonetheless physical, Strawson concludes that the physical ultimates must, in addition to whatever properties physics and neurophysiology reveal, have experiential properties as well. Strawson argues that we cannot avoid this conclusion by maintaining that combinations of physical ultimates constitute or give rise to experiential properties. Physical ultimates cannot give rise to conscious experience unless those ultimates are themselves in some way ‘intrinsically experiential’ (p. 22). The experiential cannot emerge from nonexperiential ultimates in the way that macroscopic liquidity is standardly held to emerge from molecular properties. Strawson concludes that at least some physical ultimates must be ‘intrinsically experience-involving’ (p. 22); and, since it’s reasonable to see the physical ultimates as homogeneous in nature, we should assume that they all have experiential properties

Mind-body materialism is at its most inviting in the context of trying to give a unified treatment of the natural world. And the principle challenge it faces is to do justice to the distinguishing features of mental phenomena, which set them off from nonmental, physical reality. This challenge it not easy to meet. In 1971 I suggested that the difficulty in meeting it makes especially appealing the eliminative materialism of Feyerabend and Rorty. If adopting the materialist view that mental phenomena are physical in nature prevents us from giving a satisfactory account of what is distinctive about the mental, perhaps the trouble is not with materialism but with the mental. If we can describe and explain everything about the world in physical terms but cannot give a satisfactory account of the distinctively mental, why not conclude that there simply are no mental states and events? Physical terms would then suffice to describe and explain the phenomena we now classify as mental. Even if describing and explaining these things physically is not a practical option, the possibility of doing so would underwrite the eliminative materialist position

As G. E. Moore famously observed, sentences such as 'It's raining but I don't think it is', though they aren't contradictory, cannot be used to make coherent assertions.' The trouble with such sentences is not a matter of their truth conditions; such sentences can readily be true. Indeed, it happens often enough with each of us that we think, for example, that it isn't raining even though it is. This shows that such sentences are not literally contradictory. But even though such sentences have unproblematic truth conditions, we cannot say the same about their conditions of assertibility. There are no circumstances in which one can use such sentences to perform coherent assertoric speech acts. Situations exist in which these sentences would be true, but none in which anybody could use them to say so

The so-called unity of consciousness consists in the compelling sense we have that all our conscious mental states belong to a single conscious subject. Elsewhere I have argued that a mental state's being conscious is a matter of our being conscious of that state by having a higher-order thought (HOT) about it. Contrary to what is sometimes argued, this HOT model affords a natural explanation of our sense that our conscious states all belong to a single conscious subject. HOTs often group states together, so that each HOT is about a cluster of target states; single HOTs represent qualitative states as spatially unified and intentional states as unified inferentially. More important, each HOT makes one conscious of oneself in a seemingly immediate way, encouraging a sense of unity across HOTs. And the same considerations that make us assume that our first-person thoughts all refer to the same self apply also to HOTs; becoming conscious of our HOTs in introspection thus leads to a sense that our conscious states are unified in a single self. I argue that neither essential-indexical reference to oneself nor the alleged immunity to error through misidentification conflicts with this account. I close by discussing the apparent connection of unity with free agency