Philosophy of mind has been one of the most active fields in philosophy for the past three decades. One of the most significant factors in the development of this discipline has been the emergence of cognitive science and the interest philosophers have taken in the empirical study of mind. Another equally important factor has been the "naturalistic tum" brought about by W. V. Quine. His proposal that normative epistemology be replaced by empirical psychology marked a radical departure from the Fregean "anti psychologism" and "apriorism" that had characterized much of the analytic tradition in philosophy. But while Quine's program of naturalization called the attention of philosophers to empirical psychology, his conception of psychology was inspired by an austere behaviorism which shunned the mentalism of intentional psychology in the Brentanian and phenomenological tradition. Thus, while agreeing with Brentano that the "intentional idiom" could not be reduced to that of the natural sciences, Quine argued that it is of a piece with the indeterminacy of translation. Most contributors of this col lection share the cognitivist stance and believe that the mind needs to be explained rather than eliminated. Three main questions are actually confronting current philosophers of mind, each addressed by one or another of the contributors to the present collection.

The papers in this volume are the refereed technical papers presented at AI-2006, the Twenty-sixth SGAI International Conference on Innovative Techniques and Applications of Artificial Intelligence, held in Cambridge in December 2006. They present new and innovative developments in the field. For the first time the volume also includes the text of short papers presented as posters at the conference.

This interdisciplinary collection takes up themes from the philosophy of the influential philosopher of mind David Rosenthal.

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 (HOT) 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.

Explanatory Optimism about the Hard Problem of Consciousness argues that despite the worries of explanatory pessimists, consciousness can be fully explained in “easy” scientific terms. The widespread intuition that consciousness poses a hard problem is plausibly based on how consciousness appears to us in first-person access. The book offers a debunking argument to undercut the justificatory link between the first-person appearances and our hard problem intuitions. The key step in the debunking argument involves the development and defense of an empirical model of first-person access: Automated Compression Theory (ACT). ACT holds that first-person access to consciousness is accomplished by automated accessing of compressed sensory information. Because of the distorting nature of this compressed access, it seems to subjects that consciousness possesses “exceptional” properties—properties leading to the hard problem—even though no such properties are present. If there are no exceptional properties to explain, then an explanation in easy terms can fully account for conscious experience. The book presents a range of empirical evidence for ACT and concludes that the burden of proof is now on the pessimists to show why we shouldn’t be optimistic about explaining consciousness.

Higher-Order (HO) theories of consciousness have in common the idea that what makes a mental state conscious is that it is the object of some kind of higher-order representation. This volume presents fourteen previously unpublished essays both defending and criticizing this approach to the problem of consciousness. It is the first anthology devoted entirely to HO theories of consciousness. There are several kinds of HO theory, such as the HOT (higher-order thought) and HOP (higher-order perception) models, and each is discussed and debated. Part One contains essays by authors who defend some form of HO theory. Part Two includes papers by those who are critics of the HO approach. Some of the topics covered include animal consciousness, misrepresentation, the nature of pain, subvocal speech, subliminal perception, blindsight, the nature of emotion, the difference between perception and thought, first-order versus higher-order theories of consciousness, and the relationship between nonconscious and conscious mentality. (Series A)

This collection of new essays on the systematic thought and intellectual legacy of the American philosopher Wilfrid Sellars (1912-1989) comes at a time when Sellars's influence on contemporary debates about mind, meaning, knowledge, and metaphysics has never been greater. Sellars was among the most important philosophers of the twentieth century, and many of his central ideas have become philosophical stock-in-trade: for example, his conceptions of the 'myth of the given', the 'logical space of reasons', and the 'clash' between the 'manifest and scientific images of man-in-the-world'. This volume of well-known contemporary philosophers who have been strongly influenced by Sellars—Robert Brandom, Willem deVries, Robert Kraut, Rebecca Kukla, Mark Lance, John McDowell, Ruth Millikan, James O'Shea, David Rosenthal, Johanna Seibt, and Michael Williams—critically examines the groundbreaking ideas by means of which Sellars sought to integrate our thought, perception, and rational agency within a naturalistic outlook on reality. Topics include Sellars's inferentialist semantics and normative functionalist view of the mind; his attempted reconciliations of internalist and externalist aspects of thought, meaning, and knowledge; his novel nominalist account of abstract entities; and a speculative 'pure process' metaphysics of consciousness. Of particular interest is how this volume exhibits the ongoing fruitful dialogue between so-called 'left-wing Sellarsians', who stress Sellars's various Kantian and pragmatist defenses of the irreducibility of normativity and rationality within the space of reasons, and 'right-wing Sellarsians' who defend the plausibility of Sellars's highly ambitious and systematic scientific naturalism.

This volume concerns metarepresentation: the construction and use of representations that represent other representations. It collects studies on the subject by an interdisciplinary group of contributors.

A cutting-edge and groundbreaking set of new essays by top philosophers on key topics related to the ever-influential knowledge argument.