John Campbell investigates how consciousness of the world explains our ability to think about the world; how our ability to think about objects we can see depends on our capacity for conscious visual attention to those things. He illuminates classical problems about thought, reference, and experience by looking at the underlying psychological mechanisms on which conscious attention depends.

In his comments, Richard Fumerton carefully develops two fundamental concerns with my views, which he interprets sympathetically, and almost entirely correctly. Before turning to these concerns, though, I must make one point about his concise opening statement of my principal claims. As I hope is clear from my précis, perceptual experiences provide reasons for empirical beliefs not simply in virtue of sharing demonstrative content with them. The key idea is that a person cannot properly grasp the objective content of these (...) experiences—that is, he cannot actually have experiences of particular things in the mind-independent world around him—without understanding that his apprehension that things are thus and so out there is in part due to the fact that they are. He therefore recognizes the relevant content as his epistemic openness to the way things objectively are. This is clearly central to my overall position. (shrink)

Bill Brewer presents an original view of the role of conscious experience in the acquisition of empirical knowledge. He argues that perceptual experiences must provide reasons for empirical beliefs if there are to be any determinate beliefs at all about particular objects in the world. This fresh approach to epistemology turns away from the search for necessary and sufficient conditions for knowledge and works instead from a theory of understanding in a particular area.

I take it for granted that sense experiential states provide reasons for empirical beliefs; indeed this claim forms the first premise of my central argument for (CC). 1 The subsequent stages of the argument are intended to establish that a person has such a reason for believing something about the way things are in the world around him only if he is in some mental state or other with a conceptual content: a conceptual state. Thus, given that sense experiential states (...) do provide reasons for empirical beliefs, they must have conceptual content. (shrink)

Bill Brewer contends that we should embrace a principle he calls : perceptual experiences provide reasons for empirical beliefs. He rejects traditional foundationalist and coherentist pictures of perception and perceptual justification and argues for a view on which perceptual experiences themselves intrinsically give reason for empirical beliefs. Brewer sees perceptual experience as conceptual; imbued with a content which gives a subject a perspective on the elements of his or her immediate environment. This ‘epistemic openness’ to the environment provided by perceptual (...) content grounds the reason-giving role of experience. (shrink)

In Mind and World, John McDowell argues against the view that perceptual representation is non-conceptual. The central worry is that this view cannot offer any reasonable account of how perception bears rationally upon belief. I argue that this worry, though sensible, can be met, if we are clear that perceptual representation is, though non-conceptual, still in some sense 'assertoric': Perception, like belief, represents things as being thus and so.

Suppose you are a blindsighted subject and an experimenter sitting opposite you says of an object in your functionally blind field ‘that peach looks delicious’. Unless you move your head to encompass the object within your normal field of vision you will not know which object she is talking about. Suppose now she reverts to the strategy used by neurophsychologists who work with blindsighted subjects and simply tells you that there is an object there and asks you either to reach (...) for it or guess its shape, colour and so forth. If you are one of the well-trained blindsighted subjects who have been worked over for many years by psychologists you may well be able to do so, while denying you have any visual experience of the object and insisting you are only guessing. And, in concurrence with the existential formulation the experimenter now uses, instead of the demonstrative, it is natural to think that your singular reference, based on your perceptual input, is descriptive, as in ‘the object she maintains is there’ or ‘the object I am guessing about’ or ‘the object in my blind field’, etc. (shrink)

Suppose you are a blindsighted subject and an experimenter sitting opposite you says of an object in your functionally blind field ‘that peach looks delicious’. Unless you move your head to encompass the object within your normal field of vision you will not know which object she is talking about. Suppose now she reverts to the strategy used by neurophsychologists who work with blindsighted subjects and simply tells you that there is an object there and asks you either to reach (...) for it or guess its shape, colour and so forth. If you are one of the well-trained blindsighted subjects who have been worked over for many years by psychologists you may well be able to do so, while denying you have any visual experience of the object and insisting you are only guessing. And, in concurrence with the existential formulation the experimenter now uses, instead of the demonstrative, it is natural to think that your singular reference, based on your perceptual input, is descriptive, as in ‘the object she maintains is there’ or ‘the object I am guessing about’ or ‘the object in my blind field’, etc. (shrink)

Arien Mack and Irvin Rock make the radical claim that there is no conscious perception of the visual world without attention to it.

When looking at a scene, observers feel that they see its entire structure in great detail and can immediately notice any changes in it. However, when brief blank fields are placed between alternating displays of an original and a modified scene, a striking failure of perception is induced: identification of changes becomes extremely difficult, even when changes are large and made repeatedly. Identification is much faster when a verbal cue is provided, showing that poor visibility is not the cause of (...) this difficulty. Identification is also faster for objects mentioned in brief verbal descriptions of the scene. These results support the idea that observers never form a complete, detailed representation of their surroundings. In addition, results also indicate that attention is required to perceive change, and that in the absence of localized motion signals it is guided on the basis of high-level interest. (shrink)