What is the nature of consciousness? How is consciousness related to brain processes? This volume collects thirteen new papers on these topics: twelve by leading and respected philosophers and one by a leading color-vision scientist. All focus on consciousness in the "phenomenal" sense: on what it's like to have an experience. Consciousness has long been regarded as the biggest stumbling block for physicalism, the view that the mind is physical. The controversy has gained focus over the last few decades, and (...) phenomenal knowledge and phenomenal concepts--knowledge of consciousness and the associated concepts--have come to play increasingly prominent roles in this debate. Consider Frank Jackson's famous case of Mary, the super-scientist who learns all the physical information while confined in a black-and-white room. According to Jackson, if physicalism is true, then Mary's physical knowledge should allow her to deduce what it's like to see in color. Yet it seems intuitively clear that she learns something when she leaves the room. But then how can consciousness be physical? Arguably, whether this sort of reasoning is sound depends on how phenomenal concepts and phenomenal knowledge are construed. For example, some argue that the Mary case reveals something about phenomenal concepts but has no implications for the nature of consciousness itself. Are responses along these lines adequate? Or does the problem arise again at the level of phenomenal concepts? The papers in this volume engage with the latest developments in this debate. The authors' perspectives range widely. For example, Daniel Dennett argues that anti-physicalist arguments such as the knowledge argument are simply confused; David Papineau grants that such arguments at least reveal important features of phenomenal concepts; and David Chalmers defends the anti-physicalist arguments, arguing that the "phenomenal concept strategy" cannot succeed. (shrink)

Papineau in his book provides a detailed defense of physicalism via what has recently been dubbed the “phenomenal concept strategy”. I share his enthusiasm for this approach. But I disagree with his account of how a physicalist should respond to the conceivability arguments. Also I argue that his appeal to teleosemantics in explaining mental quotation is more like a promissory note than an actual theory.

This work advances a theory in the metaphysics of phenomenal consciousness, which the author labels “e-physicalism”. Firstly, he endorses a realist stance towards consciousness and physicalist metaphysics. Secondly, he criticises Strong AI and functionalist views, and claims that consciousness has an internal character. Thirdly, he discusses HOT theories, the unity of consciousness, and holds that the “explanatory gap” is not ontological but epistemological. Fourthly, he argues that consciousness is not a supervenient but an emergent property, not reducible and endowed with (...) original causal powers, with respect to the micro-constituents of the conscious entity. Fifthly, he addresses the “zombie argument” and the “supervenience argument” within the e-physicalism framework. Finally, he elaborates on the claim that phenomenal properties are physical and discusses the “knowledge argument”. (shrink)

The most central metaphysical question about phenomenal consciousness is that of what constitutes phenomenal consciousness, whereas the most central epistemic question about consciousness is that of whether science can eventually provide an explanation of phenomenal consciousness. Many philosophers have argued that science doesn't have the means to answer the question of what consciousness is (the explanatory gap) but that consciousness nonetheless is fully determined by the physical facts underlying it (no metaphysical gap). Others have argued that the explanatory gap in (...) the sciences entails a metaphysical gap. The explanatory gap exists, they say, because there are two fundamental properties in the world that do not reduce to one another: Phenomenal and physical. This position is also known as 'property dualism'. A famous argument, formulated and defended at great length by David Chalmers, uses conceptual tools to argue for a metaphysical gap. When we just look at what the notion of phenomenal consciousness implies, we will find that it doesn't rule out that there could be entities functionally and physically identical to us but without phenomenal consciousness. A couple of further argumentative steps can get us from here to the conclusion that laying down the physical facts of our world does not necessitate phenomenal consciousness. I argue that this argument is compelling but that accepting the conclusion doesn't have the implication that science cannot discover what consciousness is. I begin by outlining and assessing a number of different positions philosophers and scientists have recently defended regarding the link between neurological systems and consciousness, I then argue that even if property dualism is true, that doesn't necessarily prevent the sciences from discovering what constitutes consciousness. That is, there may be no explanatory gap even if there is a metaphysical gap. (shrink)

At this point in time the two-dimensional (2D) argument against physicalism is well known (Chalmers 2009; 2010), as are the many responses to it. However there has been a recent development that has yet to be widely discussed. Some philosophers have argued that we have equally compelling reasons to think that dualism is false based on the conceivability of mere physical duplicates which enjoy conscious experience in just the way we do (Martin 1998; Sturgeon 2000; Piccinini 2006; Frankish 2007; Brown (...) 2010; Balog MS). This argument has not yet been properly understood and in this paper I aim to correct the most common misunderstandings. (shrink)

Recently, several philosophers have defended an explanatory argument that supposedly provides novel empirical grounds for accepting the type identity theory of phenomenal consciousness. They claim that we are justified in believing that the type identity thesis is true because it provides the best explanation for the correlations between physical properties and phenomenal properties. In this paper, I examine the actual role identities play in science and point out crucial shortcomings in the explanatory argument. I show that the supporters of the (...) argument have failed to show that the identity thesis provides a satisfactory explanation for the correlations between physical and phenomenal properties. Hence, the explanatory argument, as it stands, does not provide new grounds for accepting the type identity theory. (shrink)

Recent attempts to show that functional processing entails the presence of phenomenal consciousness have failed to deliver the kind of answers to the “problems of consciousness” that anti-materialists insist the functionalist must provide. I will illustrate this by focusing on the claims that there is a special “Hard Problem” of consciousness and an “explanatory gap” between functional and phenomenal facts. I then argue that if we supplement the functionalist stories with a relationalist conception of phenomenal properties, we can begin to (...) see the shape of a naturalistic theory of phenomenal consciousness that will provide intuitively compelling responses to these problems. (shrink)

Orthodox neural materialists think mental states are neural events or orthodox material properties of neutral events. Orthodox material properties are defining properties of the “physical”. A “defining property” of the physical is a type of property that provides a necessary condition for something’s being correctly termed “physical”. In this paper I give an argument against orthodox neural materialism. If successful, the argument would show at least some properties of some mental states are not orthodox material properties of neural events. Opposing (...) philosophical orthodoxy, I show there are no posteriori identities -- identities that cannot be known of a priori. (shrink)

Quale sia la natura della coscienza è uno dei problemi più analizzati e discussi sia nella ricerca filosofica sia in quella scientifica. Ogni mese nel mondo vengono pubblicati diversi libri dedicati a questo argomento, e decine di riviste specialistiche ospitano articoli e saggi volti a chiarirne le varie componenti; sotto una tale pressione sono nate alcune riviste scientifiche dedicate esclusivamente all'argomento. A questo fiorire di ricerche corrisponde una quantità altrettanto elevata di approcci. Una rivista come il Journal of consciousness studies, (...) ad esempio, annovera contributi di filosofi e neurobiologi, scienziati cognitivi e psicologi gli uni accanto agli altri, a testimoniare proprio la varietà delle questioni e dei metodi di indagine che si addensano attorno ai fenomeni coscienti. Nel libro ho tenuto fede a questa molteplicità, descrivendo le principali teorie filosofiche accanto ai risultati empirici di psicologi e neurologi. Per ragioni di spazio e di taglio generale ho dovuto eliminare molto, e ogni volta penso a quanti autori e correnti di un certo rilievo ho dovuto tralasciare. Lo scopo principale di questo volume, tuttavia, non è quello dell'esaustività, quanto piuttosto di fornire un quadro per chi voglia orientarsi nel problema della coscienza, purché sia attrezzato di una buona dose di curiosità e di un po' di tenacia per poter affrontare qualche dettaglio più tecnico; non è dunque una summa enciclopedica di quel che si studia oggi sotto l'etichetta “coscienza”. Con questo spirito ho descritto, nel primo capitolo, le radici filosofiche del problema della coscienza rifacendomi a molti classici, alcuni dei quali davvero sorprendentemente attuali. Nel capitolo successivo ho analizzato i diversi risultati empirici sui quali si stanno costruendo le teorie più interessanti; il terzo capitolo presenta una serie di teorie filosofiche volte a difendere l'autonomia della coscienza dalle spiegazioni naturalistiche, e il filosofo David Chalmers fa la parte del campione di questo schieramento. L'ultimo capitolo propone invece le teorie più marcatamente naturalistiche, ed è il filosofo Daniel Dennett a portare il vessillo del rappresentante. I quattro capitoli che compongono il libro, dunque, alternano l'approccio filosofico, dedito a chiarire i presupposti concettuali, e quello naturalistico ed empirico, basato sulle tecniche sperimentali, per rendere conto proprio della varietà del problema coscienza, e di come esso rappresenti forse l'ultima frontiera con la quale noi esseri umani proviamo a ritagliarci un posto speciale tra ciò che ci circonda. È sufficiente volgersi alla storia della scienza per constatare le radici di una simile esigenza. Galileo Galilei ha spostato il nostro pianeta dal centro del cosmo ad una marginale periferia; Charles Darwin ci ha inserito, esseri naturali ed emotivi, nel mondo biologico al pari di ogni altra specie; Alan Turing, infine, ha mostrato che molta della nostra cognizione può essere trattata con metodi computazionali. La coscienza sembra l'ultimo baluardo che separa, categorialmente se non ontologicamente, la nostra specie da tutto il resto. L'eventualità di tradurla in termini neurobiologici è da molti considerata una chimera, e la liceità di una simile ipotesi è posta sotto scrutinio per evidenziarne i presupposti filosofici. Questo testo dovrebbe aiutare a capire quali sono gli snodi del problema e chi ha buone prospettive di cogliere nel segno. (shrink)

This is a book about sensory states and their apparent characteristics. It confronts a whole series of metaphysical and epistemological questions and presents an argument for type materialism: the view that sensory states are identical with the neural states with which they are correlated. According to type materialism, sensations are only possessed by human beings and members of related biological species; silicon-based androids cannot have sensations. The author rebuts several other rival theories (dualism, double aspect theory, eliminative materialism, functionalism), and (...) explores a number of important issues: the forms and limits of introspective awareness of sensations, the semantic properties of sensory concepts, knowledge of other minds, and unity of consciousness. The book is a significant contribution to the philosophy of mind, and has much to say to psychologists and cognitive scientists. (shrink)

In what follows I present an approach to the problem of consciousness, which I take to be suggested by Wittgenstein's remarks on sensation. As sketched here, this consists of a number of empirical hypotheses about the mind and how we represent it, and a series of arguments that these hypotheses explain phenomena which constitute the problem of consciousness, in such a way as to render them neither mysterious nor problematic.

Twenty-three philosophers examine the doctrine of materialism find it wanting.

In order to solve the problem of the monstrous acts that an all-powerful, all-knowing God would daily be performing, we need to sever the God of Power from the God of Value. The former is the underlying dynamic unity in the physical universe, eternal, omnipresent, all-powerful, but an It, and thus not capable of knowing what It does. It can be forgiven the terrible things It does. The latter is what is of most value associated with our human world - (...) or the world of sentient life more generally. Having performed this surgical operation on God, the problem then becomes: How can we put the two halves of God together again? How can our human world, imbued with experiential qualities, consciousness, free will meaning and value, exist and best flourish, embedded as it is in the physical universe? This is our fundamental problem - philosophical, intellectual and practical. It is our fundamental religious problem. (shrink)

How can we understand our human world, embedded as it is within the physical universe, in such a way that justice is done to both the richness, meaning and value of human life on the one hand, and what modern science tells us about the physical universe on the other hand? I argue that, in order to solve this problem, we need to see physics as being concerned only with a highly selected aspect of reality – that aspect which determines (...) how events unfold – the causally efficacious aspect. Physics cannot describe the experiential, and if it is extended so that it does so, physical theory would cease to be explanatory. The human world can, however, be understood in terms of a different kind of explanation, which I call “personalistic”. This is not reducible to physical explanation. The world is, in short, riddled with what may be called “double comprehensibility”. (shrink)

A strong impossibility is a situation that is epistemically, but not metaphysically, possible. Opponents of strong impossibilities (including Chalmers, Jackson and Stalnaker) have argued that we have “overwhelming reason” to reject and “very little” or “no reason” to think that such impossibilities exist. This partial draft argues that there are strong impossibilities and (very briefly) discusses the manner in which the existence of strong impossibilities is related to some much-discussed arguments in the philosophy of conscious experience. (The full version of (...) the paper will ultimately include a reply to the most significant argument against strong impossibilities, and a (slightly) more involved discussion of the relevance of all of this to issues in the philosophy of conscious experience.). (shrink)

In this paper Popper formulates and discusses a new aspect of the theory of mind. This theory is partly based on his earlier developed interactionistic theory. It takes as its point of departure the observation that mind and physical forces have several properties in common, at least the following six: both are (i) located, (ii) unextended, (iii) incorporeal, (iv) capable of acting on bodies, (v) dependent upon body, (vi) capable of being influenced by bodies. Other properties such as intensity and (...) extension in time may be added. It is argued that a fuller understanding of the nature of forces is essential for the analysis of the mind-brain problem. The relative autonomy and indeterministic nature of mind is stressed. Indeterminism is treated in relation to a theorem of Hadamard. The computer theory of mind and the Turing test are criticized. Finally the evolution of mind is discussed. (shrink)

Benjamin Libet's influential publications have raised important questions about voluntarist accounts of action. His findings are taken as evidence that the processes in the central nervous system associated with the initiation of an action occur earlier than the decision to act. However, in light of the methods employed and of relevant findings drawn from research addressed to the timing of neurobehavioural processes, Libet's conclusions are untenable.

Wilfrid Sellars has proposed a materialist account of sensation which relies in part on the postulation of special kinds of individuals. This postulational strategy appears to be analogous to the one that introduces such entities as electrons. After setting out Sellars' account, I focus on his application of the postulational strategy. I argue that this application requires the discovery of new effects for familiar properties; that this kind of discovery is disanalogous to what postulation usually does; and that this kind (...) of discovery cannot really be arrived at by postulation. I conclude that Sellars has not provided a successful, materialist account of sensation. (shrink)

I. Zombies and the Knowledge Argument John Perry.

Metaphysics of Consciousness , a volume in the series Philosophical Issues in Science , discusses the philosophical issue of the nature of consciousness. William Seager argues that the purely physicalist or materialist view of human consciousness is by no means disproved and is in fact strongly supported by some developments in artificial intelligence. William Seager proceeds by addressing the problems of consciousness that remain even for a minimal physicalism. The particular modes of subjective consciousness that constitute experience threaten a paradigm (...) of scientific understanding, labelled "physical resolution," that prospers in all other realms of inquiry. A phenomenon is physically resolved by demonstrating that its components are made up of purely physical parts and its causal efficacy is grounded in the physical properties of parts. The apparent inability to resolve physical consciousness leaves it not only inexplicable, but inexplicable in a way that threatens even a minimal physicalism. This book is distinctive in its emphasis on the legitimacy of inexplicability and its argument that consciousness transcends the paradigm of physical resolution. It will be of great use to advanced students and lecturers in philosophy. (shrink)

This article challenges the neo-Darwinist physicalist position assumed by currently prevalent naturalizing accounts of consciousness. It suggests instead an evolutionary (Deweyan) understanding of cognitive emergence and an acceptance of mental capacity as a phenomenon in its own right, differing qualitatively from, although not independent of, the physical and material world. I argue that if we accept that consciousness is an adaptation enabling survival through immediate individual intuition of the world, we may accept this metaphysics as a given. Methodological focus can (...) then shift to investigating the, as yet untheorized, nature of consciousness itself as capacity/interconnectivity/potential. The article accepts Joseph Margolis's recent advocacy of a pragmatist approach that is "natural but not naturalizable" (Margolis 2002, 7), that is, an anti-reductionist as opposed to an eliminativist position, but it seeks to develop this position further and to give it new direction. (shrink)

Stoljar’s book has three parts. In the first part, he discusses the “problem of experience”: though we have experiences, it isn’t clear that the experiential fits into the actual world, given that the actual world is fundamentally non-experiential. Stoljar focuses on what he views as one facet of the problem of experience, the “logical problem”, which consists of three jointly inconsistent claims: (T1) there are experiential truths; (T2) if there are experiential truths, every experiential truth is entailed by some non-experiential (...) truth; and (T3) if there are experiential truths, not every experiential truth is entailed by some non-experiential truth. The logical problem is a problem, according to Stoljar, because each of T1–T3 is prima facie plausible. In the second part, Stoljar sets out his solution to the logical problem, the “epistemic view”, and defends it against various objections. According to the epistemic view, (i) we’re ignorant of a special type of empirical experience-relevant non-experiential truth; (ii) were we to come to understand truths of this type, we would see that the modal arguments against physicalism (i.e. the zombie and knowledge arguments) fail; and (iii) given (i) and (ii), we should reject T3 in order to resolve the logical problem. In the third part Stoljar argues that alternative solutions to the logical problem either fail or collapse into the epistemic view. While this is certainly the most careful and extended defense of the epistemic view to date (a view, by the way, in various forms, with which many seem to find sympathy), the epistemic view as Stoljar develops it faces a formidable problem. The central problem.. (shrink)