Paul Coates

The problem of the richness of visual experience is that of finding principled grounds for claims about how much of the world a person actually sees at any given moment. It is argued that there are suggestive parallels between the two-component analysis of experience defended by Wilfrid Sellars, and certain recently advanced information processing accounts of visual perception. Sellars' later account of experience is examined in detail, and it is argued that there are good reasons in support of the claim that the sensory nonconceptual content of experience can vary independently of conceptual awareness. It is argued that the Sellarsian analysis is not undermined by recent work on change blindness and related phenomena; a model of visual experience developed by Ronald Rensink is shown to be in essential harmony with the framework provided by Sellars, and provides a satisfactory answer to the problem of the richness of visual experience.

Experiences of all kinds have a distinctive character, which marks them out as intrinsically different from states of consciousness such as thinking. A plausible view is that the difference should be accounted for by the fact that, in having an experience, the subject is somehow immediately aware of a range of phenomenal qualities. For example, in seeing, grasping and tasting an apple, the subject may be aware of a red and green spherical shape, a certain feeling of smoothness to touch, and a sweet sensation. Such phenomenal qualities are also immediately present in hallucinations. According to the sense-data theory, phenomenal qualities belong to items called “sense-data.” In having a perceptual experience the subject is directly aware of, or acquainted with, a sense-datum, even if the experience is illusory or hallucinatory. The sense-datum is an object immediately present in experience. It has the qualities it appears to have.

In this paper I introduce and critically examine a paradox about perceiving that is in some ways analogous to the paradox about meaning which Kripke puts forward in his exegesis of Wittgenstein's views on Rule-following. When applied to vision, the paradox of perceiving raises a metaphysical scepticism about which object a person is seeing if he looks, for example, at an apple on a tree directly in front of him. Physical objects can be seen when their appearance is distorted in various ways by illusions. The question therefore arises as to how can we answer the sceptic who suggests the following: although the viewer appears to be seeing the green apple in front of him, he is actually suffering a bizarre illusion of a blue car situated somewhere behind him. The sceptic is not concerned with epistemic problems about how we know which object, if any, the subject is seeing; the sceptic is raising the more fundamental question: whatfact of the matter underlies a person's perceptual relation to the physical world, in virtue of which that person may be justified in arriving at a perceptual belief about the environment? Among the various different issues raised by the sceptic, I focus on the question: what determines the perceiving relation? I canvass a number of possible proposals in answer to it, concentrating mainly on two opposed accounts: the Disjunctive View and the Causal Theory of Perception. I argue in particular for the following two claims: that the paradox highlights the fact that the Disjunctive View fails to provide a coherent positive account of what perceiving is. that the problem of 'deviant causal chains', often thought to raise particular difficulties for the Causal theorist, can also be raised against other accounts of perception, including versions of the Disjunctive View. I conclude that unless the Causal Theory of Perception can be upheld, there will be no way of answering the sceptic.

This paper defends a dynamic model of the way in which perception is integrated with action, a model I refer to as ‘the navigational account’. According to this account, employing vision and other forms of distance perception, a creature acquires information about its surroundings via the senses, information that enables it to select and navigate routes through its environment, so as to attain objects that satisfy its needs. This form of perceptually guided activity should be distinguished from other kinds of semi-automatic responses to visual stimuli that do not necessarily involve conscious experiences. It essentially involves inner states, which involve both the awareness of phenomenal qualities, and also a representational component. The navigational account is compared here with the enactive approach to perception, which opposes the view that perceptual experiences are inner states. This paper argues that a full account of perception raises a number of different questions. One central explanatory project concerns questions about the kinds of processes that currently enable a creature to identify and respond appropriately to distant objects: the answer, it is argued, lies in acknowledging the role of conscious inner representations in guiding navigational behaviour through complex environments. The fact that perception and action are interdependent does not conflict with the claim that inner representational states comprise an essential stage in visual processing.

Chess is sometimes referred to as a ‘mind-sport’. Yet, in obvious ways, chess is very unlike physical sports such as tennis and soccer; it doesn't require the levels of fitness and athleticism necessary for such sports. Nor does it involve the sensory-governed, skilled behaviour required in activities such as juggling or snooker. Nevertheless, I suggest, chess is closer than it may at first seem to some of these sporting activities. In particular, there are interesting connections between the way that we use our perceptual imagination in sports, and also in chess. The same distinction between calculation and natural instinct applies in chess as it does in many physical sports.