Online research in philosophy

Synaesthetes persistently perceive certain stimuli as systematically accompanied by illusory colours, even though they know those colours to be illusory. This appears to contrast with cases where a subject’s colour vision adapts to systematic distortions caused by wearing coloured goggles. Given that each case involves longstanding systematic distortion of colour perception that the subjects recognize as such, how can a theory of colour perception explain the fact that perceptual adaptation occurs in one case but not the other? I argue that these cases and the relationship between them can be made sense of in light of an existing view of colour perception. Understanding colours as ways in which objects and surfaces modify light, perceived through grasping patterns and variations in colour appearances, provides a framework from which the cases and their apparent disanalogy can be predicted and explained. This theory’s ability to accommodate these cases constitutes further empirical evidence in its favour.

Timothy Williamson’s project in Knowledge and Its Limits (Williamson, 2000)1 includes proposals for substantial revisions in the received approach to epistemology. One received view is that knowledge is conceptualized in terms of a conjunction of factors that are individually necessary and jointly sufficient for knowing. A central aim of epistemology is to state such necessary and sufficient conditions. Against this received view, Williamson argues that a necessary but insufficient condition need not be a conjunct of a non-circular necessary and sufficient condition. Although being coloured is a necessary but insufficient condition for being red, we cannot state a necessary and sufficient condition for being red by conjoining being coloured with other properties specified without reference to red. Neither the equation ‘Red = coloured + X’ nor the equation ‘Knowledge = true belief + X’ need have a non-circular solution. (3) Williamson further argues that we have inductive reasons for thinking that no analysis of the concept knows of the standard kind is correct. The inductive reasons are simply the history of failed attempts at such “factorizing” or “decompositional” analyses. Williamson not only rejects the prospect of explaining knowledge in terms of belief, justification, and evidence, but he proposes to reverse the order of explanation. That order of explanation has been reversed in this book. The concept knows is fundamental, the primary implement of epistemological inquiry. (185) It is not altogether easy, however, to reconcile this radical program with other things Williamson says in the book. In particular, the book contains two rather unrelated accounts of knowing, and one of these accounts appeals to some of the same ingredients that traditional (or semi-traditional) analysts have used in the past. The first account, which appears in Chapter 1, says that knowing is the most general factive stative propositional attitude. The account is presented in terms of three conditions: (1) If Φ is an FMSO [factive mental state operator], from ‘S Φs that A’ one may infer ‘A’..

visually or directly by hand 3,3•4, and the `weighing' of half-inch "The apparent weight of colours . Pictures are often said to circles of coloured paper at either end of a simulated balance have a centre of gravity, perhaps determined by the way the..

The Quest for Reality, contains, amongst much else, a sustained and deeply illuminating investigation of the thesis Barry Stroud labels ’subjectivism’ about colours. The grounds he relentlessly amasses for rejecting the thesis are, in my view, compelling. There is a sense, indeed, in which I think they are more compelling than he says he himself finds them. For as I understand his arguments, they contain the materials for delivering a positive answer to the question: are objects really coloured? As Stroud himself presents the outcome of his investigation, they do not. Actually, to put it in this ’headline-grabbing’ way is misleading. The real issue turns on the main concern of his book-- his immensely thought-provoking investigation of the questions: what counts as a metaphysical account of reality? And, in the test case of colours, can the task of addressing the question of whether they are or are not part of reality be successfully undertaken? The suggestion I will be making is that his rejection of subjectivism contains the materials for asking about the metaphysical reality of colour in a way that is distinct from the way he shows cannot work; and that on this distinct way, the answer to the question of whether objects are really coloured is: yes. So, he might either reject the very idea that this alternative way of framing the question about colours does count as an example of a metaphysical quest for their reality; or he might agree that it is one, but disagree with the positive answer I sketch on his behalf, so to speak.

In this paper, we show that Higher{Order Coloured Uni cation { a form of uni cation developed for automated theorem proving { provides a general theory for modeling the interface between the interpretation process and other sources of linguistic, non semantic information. In particular, it provides the general theory for the Primary Occurrence Restriction which (Dalrymple et al., 1991)'s analysis called for.