Online research in philosophy

The Knowledge argument based on the grey Mary thought experiment cannot be claimed as a basis for rejecting physicalism. First, because it is flawed, being so formulated as to predetermine the outcome of the thought experiment in favour of a refutation of physicalism. Second, because, once this is recognised, it becomes clear that there is one - and only one - account of the qualia-physical relationship that will permit physicalism to survive the thought experiment itself. It is suggested that the position in question is worthy of further consideration as a reasonable candidate theory for a physicalist account of qualia.

This essay is a defence of the traditional notion of qualia - as properties of consciousness that are ineffable, intrinsic, private and immediately apprehensible - against the eliminative attempts of Daniel Dennett in the influential article "Quining Qualia." It is suggested that a thorough exploration of the concept is an appropriate starting point for future explanations of qualia, and the essay ends with some possible explanations of the four traditional properties.

Although the capacity to discriminate between different qualia is typically admitted to have a definition in terms of functional role, the qualia thereby related are thought to elude functional definition. In this paper I argue that these views are inconsistent. Given a functional model of discrimination, one can construct from it a definition of qualia. The problem is similar in many ways to Goodman's definition of qualia in terms of 'matching', and I argue that many of his findings survive reinterpretation into a physicalistic basis which employs 'indiscriminability' as its primitive term. I show how one can identify the critical properties to which discrimination capacities are sensitive, and then identify their order. A problem arises concerning the different ways in which qualitatively distinct experiences can differ (hue, shape, and so on). Physicalist accounts have often been accused of relying in a circular fashion on some antecedent understanding of phenomenal properties in order to specify those differences. This account avoids such an accusation: ordering of critical properties is determined by the dimensionality of discriminations, and the latter is given by the structure of the discrimination pair lists. Once a topology of quality is constructed, qualia names can be defined by their relative location within the order. In the conclusion I argue that psychophysics employs physicalist techniques to define a topology of quality, and that it can provide what Thomas Nagel calls an "objective phenomenology.".

Introduction Qualia and causation Do qualia exist? Qualia and cognitive science Qualia and other mental phenomena Knowledge of qualia Are qualia irreducible?

Representational theorists identify experiences’ phenomenal properties with their representational properties. Qualia theorists reject this identity, insisting that experiences’ phenomenal properties can come apart from and completely outrun their representational properties. Qualia theorists account for phenomenal properties in terms of “qualia,” intrinsic mental properties they allege experiences to instantiate. The debate between representational theorists and qualia theorists has focused on whether phenomenal properties really can come apart from and completely outrun representational properties. As a result, qualia theorists have failed (1) to explain how experiences owe their phenomenal properties to their instantiation of qualia and (2) to clarify the nature of subjects’ epistemic access to qualia. I survey qualia theorists’ options for dealing with each issue and find them all wanting.

I have argued that to say qualia are epiphenomenal is to say a world without qualia would be physically identical to a world with qualia. Dan Cavedon-Taylor has offered an alternative interpretation of the commitments of qualia epiphenomenalism according to which qualia cause beliefs and those beliefs can and do cause changes to the physical world. I argue that neither of these options works for the qualia epiphenomenalist and thus that theory faces far more serious difficulties than has previously been recognized.

A physicalist view of qualia labelled non-eliminative reductionism is outlined. If it is true, qualia and physicalism can co-exist without difficulty. First, qualia present no particular problem for reductionist physicalism - they are entirely physical, can be studied and explained using the standard scientific approach, and present no problem any harder than any other scientists face. Second, reductionist physicalism presents no particular problem for qualia – they can be encompassed within an entirely physicalist position without any necessity, either to reduce them to non-existence, or to treat them as new fundamental properties. It is suggested that the position also has sufficient explanatory power to successfully deal with the 'why like anything – why does experience exist at all' question and to counter both Chalmers' Conceivability Argument and Jackson's Knowledge Argument.

It is widely accepted that conscious experience has a physical basis. That is, the properties of experience (phenomenal properties, or qualia) systematically depend on physical properties according to some lawful relation. There are two key questions about this relation. The first concerns the strength of the laws: are they logically or metaphysically necessary, so that consciousness is nothing "over and above" the underlying physical process, or are they merely contingent laws like the law of gravity? This question about the strength of the psychophysical link is the basis for debates over physicalism and property dualism. The second question concerns the shape of the laws: precisely how do phenomenal properties depend on physical properties? What sort of physical properties enter into the laws' antecedents, for instance; consequently, what sort of physical systems can give rise to conscious experience? It is this second question that I address in this paper.