Sven Walter

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.

In 'Jackson on physical information and qualia' Terry Horgan defended physicalism against Frank Jackson's Knowledge Argument by raising what later has been called the 'mode of presentation reply'- arguingthatthe Knowledge Argumentis fallacious because itsubtly equivocates on two different readings of 'physical information'. In 'Mary, Mary, quite contrary' however, George Graham and Terry Horgan maintain that none of the replies against Jackson has yet been successful, not even Horgan's own 1984 rejoinder.Tosubstantiate their claim, they present an allegedly improved version of the Knowledge Argument, the 'Mary Mary Argument' whose default moral is property-dualism. In section 1, I will set the scene by making some clarifying remarks regarding Jackson's original argument. In section 2, I will consider several objections to the most promising physicalist rejoinder to the Knowledge Argument, the mode of presentation reply. In section 3 I will discuss the Mary Mary Argument and propose the indexical account of consciousness that, as it happens, is based on Horgan's own 1984 account as a possible solution. Finally,in section 4, I will argue that to the extent that the Mary Mary Argument exceeds the force of Jackson's original challenge it coincides with Joe Levine's Explanatory Gap Argument

In der Debatte zwischen Dualisten und Physikalisten spielen Zombies seit geraumer Zeit eine entscheidende Rolle – physikalische Duplikate phänomenal bewusster Lebewesen, die selbst nicht phänomenal bewusst sind. Die Vorstellbarkeit bzw. Möglichkeit von Zombies bringt, so die Standardauffassung, den Physikalismus in Schwierigkeiten: Wenn die physikalische Ausstattung der Welt die Welt in ihrer Gesamtheit determiniert, wie vom Physikalismus gefordert, dann kann es keine physikalischen Duplikate phänomenal bewusster Lebewesen geben, die nicht ebenfalls phänomenal bewusst sind. Die Arbeit argumentiert dafür, dass die Standardauffassung falsch ist. Aus den üblicherweise angestellten Überlegungen ergibt sich kein zwingendes Argument gegen den Physikalismus, sondern bestenfalls die überraschende Konsequenz, dass Physikalisten wie Dualisten ihre jeweilige Position nicht als kontingent betrachten können, und schlimmstenfalls die nicht minder überraschende Konsequenz, dass der Dualismus falsch ist, wenn der Physikalismus mit der Möglichkeit von Zombies unverträglich ist.The debate between dualism and physicalism has recently been dominated by zombies—physical duplicates of phenomenally conscious beings that lack phenomenal consciousness. According to the standard view, the conceivability or possibility of zombies creates a serious problem for physicalism: If the physical make-up of the word determines the world in its entirety, as physicalism maintains, then there can be no physical duplicates of phenomenally conscious beings that are not phenomenally conscious. This paper argues that the standard view is wrong. The considerations usually appealed to do not yield a convincing argument against physicalism. At best, they result in the surprising claim that physicalists and dualists cannot understand their respective views as a contingent claim; at worst , they yield the no less surprising result that dualism is wrong if physicalism is incompatible with the possibility of zombies

Epistemological approaches to mental causation argue that the notorious problem of mental causation as captured in the question “How can irreducible, physically realized, and potentially relational mental properties be causally efficacious in the production of physical effects?” has a very simple solution: One merely has to abandon any metaphysical considerations in favor of epistemological considerations and accept that our explanatory practice is a much better guide to causal relevance than the metaphysical reasoning carried out from the philosophical armchair. I argue that epistemological approaches to mental causation do not enjoy any genuine advantage over theories which treat the problem of mental causation as a genuinely metaphysical problem

Frank Jackson and Philip Pettit have defended a non-reductive account of causal relevance known as the ‘program explanation account’. Allegedly, irreducible mental properties can be causally relevant in virtue of figuring in non-redundant program explanations which convey information not conveyed by explanations in terms of the physical properties that actually do the ‘causal work’. I argue that none of the possible ways to spell out the intuitively plausible idea of a program explanation serves its purpose, viz., defends non-reductive physicalism against Jaegwon Kim’s Causal Exclusion Argument according to which non-reductive physicalism is committed to epiphenomenalism because irreducible mental properties are ‘screened off’ from causal relevance by their physical realizers. Jackson and Pettit’s most promising explication of a program explanation appeals to the idea of invariance of effect under variation of realization , but I show that invariance of effect under variation of realization is neither necessary nor sufficient for causal relevance