Online research in philosophy

We assemble here in this time and place to discuss the thesis that conscious attention can provide knowledge of reference of perceptual demonstratives. I shall focus my commentary on what this claim means, and on the main argument for it found in the first five chapters of Reference and Consciousness. The middle term of that argument is an account of what attention does: what its job or function is. There is much that is admirable in this account, and I am (...) confident that it will be the foundation, the launching-pad, for much future work on the subject. But in the end I will argue that Campbell’s picture makes the mechanisms of attention too smart: smarter than they are, smarter than they could be. If we come to a more realistic appraisal of the skills and capacities of our sub-personal minions, the “knowledge of reference” which they yield will have to be taken down a notch or two. (shrink)

Introduction -- The varieties of is -- Individuals, kinds, and realism -- Semantics, metaphysics, and necessity -- New developments -- Sortal terms and criteria of identity -- Individuals, sorts, and instantiation -- Number, unity, and individuality -- The absoluteness of identity : a defence -- Appendix: Some formal principles and arguments -- Identity and constitution -- Parts and wholes -- Persons and their bodies -- Matter and organisms -- Organisms and persons -- Is there a criterion of personal identity? -- (...) Sortal terms and natural laws -- Plural quantification and sortal reference -- Laws, dispositions, and sortal logic -- Appendix: An axiomatic system of sortal logic -- What sorts of things are there? -- The syntax and semantics of complex sortal terms -- On the identity of sorts. (shrink)

I examine John Campbell’s claim that the determination of the reference of a perceptual demonstrative requires conscious visual object-based selective attention. I argue that although Campbell’s claim to the effect that, first, a complex binding parameter is needed to establish the referent of a perceptual demonstrative, and, second, that this referent is determined independently of, and before, the application of sortals is correct, this binding parameter does not require object-based attention for its construction. If object-based attention were indeed required then (...) the determination of the referent would necessarily involve the application of sortal concepts, since object-based attention initiates top-down cognitive effects on visual processing. I also examine Mohan Matthen’s claim that reference to objects is established only through the visual processing in the dorsal visual stream and argue that although it is true that processing in the dorsal stream can determine reference, a thesis that goes against Campbell’s view that the determination of the referent requires conscious attention, processing along the ventral visual stream can also establish the reference of perceptual demonstratives. It also claim that Matthen’s account of dorsal processing underestimates the kind of information processed along the dorsal stream and this has some implications regarding perceptual demonstratives reference fixing. (shrink)

Sensory classification is a central theme of Mohan Matthen's wonderful book, Seeing, Doing, and Knowing.1 My plan for this commentary is simple: I shall list a series of claims that Matthen makes about the classes involved in sensory classification. Each member of the series is admirable, and seems credible on its own. The question at the end is whether we can hold them all, together.

Echoing a distinction made by David Wiggins in his discussion of the relation of identity, this paper investigates whether aesthetic adjectives such as ‘beautiful’ are sortal-relative or merely sortal-dependent. The hypothesis guiding the paper is that aesthetic adjectives, though probably sortal-dependent in general, are sortal-relative only when used to characterize multifunctional artefacts. This means that multifunctional artefacts should be unique in allowing the following situation to occur: for some object x there are sortals K and K' such that x is (...) a beautiful K and also a K', but not a beautiful K'. Examples of multifunctional artefacts show that this is indeed a possibility. However, that multifunctional artefacts are unique in this respect will be demonstrated by a more principled argument, taking into account the nature of functions on the one hand, and the nature of artefact-classification on the other hand. (shrink)

Forthcoming in Philosophy and Phenomenological Research, 2008, A book symposium commentary on Mohan Matthen’s Seeing, Doing, and Knowing.

John Campbell argues that visual attention to objects is the means by which we can refer to objects, and that this is so because conscious visual attention enables us to retrieve information about a location. It is argued here that while Campbell is right to think that we visually attend to objects, he does not give us sufficient ground for thinking that consciousness is involved, and is wrong to assign an intermediary role to location. Campbell’s view on sortals is also (...) queried, as is his espousal of the so-called Referential View of Experience. (shrink)

This paper contrasts three different schemes of reference relevant to understanding systems of perceptual representation: a location-based system dubbed "feature-placing", a system of "visual indices" referring to things called "proto-objects", and the full sortal-based individuation allowed by a natural language. The first three sections summarize some of the key arguments (in Clark, 2000) to the effect that the early, parallel, and pre-attentive registration of sensory features itself constitutes a simple system of nonconceptual mental representation. In particular, feature integration--perceiving something as (...) being both F and G, where F and G are sensible properties registered in distinct parallel streams--requires a referential apparatus. Section V. reviews some grounds for thinking that at these earliest levels this apparatus is location-based: that it has a direct and nonconceptual means of picking out places. Feature-placing is contrasted with a somewhat more sophisticated system that can identify and track four or five "perceptual objects" or "proto-objects", independently of their location, for as long as they remain perceptible. Such a system is found in Zenon Pylyshyn's fascinating work on "visual indices", in Dana Ballard's notion of deictic codes, and in Kahneman, Treisman, and Wolfe's accounts of systems of evanescent representations they call "object files". Perceptual representation is a layered affair, and I argue that it probably includes both feature-placing and proto-objects. Finally, both nonconceptual systems are contrasted with the full-blooded individuation allowed in a natural language. (shrink)