The Problem of Perception offers two arguments against direct realism--one concerning illusion, and one concerning hallucination--that no current theory of ...

It is argued that Husserl was an “externalist” in at least one sense. For it is argued that Husserl held that genuinely perceptual experiences—that is to say, experiences that are of some real object in the world—differ intrinsically, essentially and as a kind from any hallucinatory experiences. There is, therefore, no neutral “content” that such perceptual experiences share with hallucinations, differing from them only over whether some additional non-psychological condition holds or not. In short, it is argued that Husserl was (...) a “disjunctivist”. In addition, it is argued that Husserl held that the individual object of any experience, perceptual or hallucinatory, is essential to and partly constitutive of that experience. The argument focuses on three aspects of Husserl’s thought: his account of intentional objects, his notion of horizon, and his account of reality. (shrink)

Written by the 11th-century Spanish Arab, Abh Muhammad ibn MucnOn Twilight and the Rising of Cloudsdh's value of around 52 miles remained standard until the 17th century, when it was revised sharply downward in consideration of atmospheric refraction and barometric studies. The treatise itself survives in a single Hebrew exemplar, 25 Latin exemplars, and an Italian exemplar derived from the Latin. At the heart of this present study is a critical text based on a fullscale comparative transcription of 22 of (...) the Latin manuscripts, ranging in date from the 13th to the 17th century. (shrink)

“Although up to now the [visual] image has been [understood as] a construct of reason,” Kepler observes in the fifth chapter of his Ad Vitellionem Paralipomena, “henceforth the [visible] representations of objects should be considered as paintings [ picturae ] that are actual[ly projected] on paper or some other screen.” While not intended as a historical generalization, this claim nonetheless reflects historical reality. Virtually all visual theorists before Kepler did, in fact, conceive of optical images as subjective, not objective constructs (...) – or, to put it in modern terms, as virtual rather than real entities. By current lights, of course, the distinction between virtual and real images is both obvious and common-place: whereas the latter can be physically projected upon a screen, the former cannot. (shrink)

Evolving the Mind has two main themes: how ideas about the mind evolved in science; and how the mind itself evolved in nature. The mind came into physical science when it was realised, first, that it is the activity of a physical object, a brain, which makes a mind; and secondly, that our theories of nature are largely mental constructions, artificial extensions of an inner model of the world which we inherited from our distant ancestors. From both of these perspectives, (...) consciousness is the great enigma. If consciousness evolved, however, it is in some sense a material thing whatever else may be said of it. Physics, chemistry, molecular biology, brain function and evolutionary biology - almost the whole of science - is involved, and there can be no expert in all these fields. So the style of the book is simple, almost conversational. The excitement is that we seem to be close to a scientific theory of consciousness. (shrink)

This paper proposes a generalization of the Kripke semantics of intuitionistic logic IL appropriate for intuitionistic Łukasiewicz logic IŁL — a logic in the intersection between IL and (classical) Łukasiewicz logic. This generalised Kripke semantics is based on the poset sum construction, used in Bova and Montagna (Theoret Comput Sci 410(12):1143–1158, 2009) to show the decidability (and PSPACE completeness) of the quasiequational theory of commutative, integral and bounded GBL algebras. The main idea is that w \Vdash \sigma—which for IL is (...) a relation between worlds w and formulas \sigma, and can be seen as a function taking values in the booleans w \Vdash \sigma \in {B}—becomes a function taking values in the unit interval w \Vdash \sigma \in [0,1]. An appropriate monotonicity restriction (which we call sloping functions) needs to be put on such functions in order to ensure soundness and completeness of the semantics. (shrink)

Background There is broad international agreement from clinicians and academics that healthcare rationing should be undertaken as explicitly as possible, and the BMA have publicly supported the call for more accountable priority setting for some time. However, studies in the UK and elsewhere suggest that clinicians experience a number of barriers to rationing openly, and the information needs of patients at the point of provision are largely unknown. Methodology In-depth interviews were undertaken with NHS professionals working at the community level (...) of provision, and with patients and professionals receiving or providing treatment for morbid obesity and breast cancer (n=52). Results Nearly all patients wanted to know about healthcare rationing and had high expectations of their clinical professionals to provide all relevant information about treatment options. However, professionals did not always understand these information requirements, and cases of implicit rationing were common. The existence of relevant national guidance was not always known about, meaning that patients were often reliant on other sources of information about treatment options, which included the popular media, the internet, patient advocacy groups and informal networks of support. Discussion Clinical professionals need to understand patients' need for detailed information when it comes to rationing, and to understand that they are the main gateway for this to be provided. However, disclosure could be distressing for both patients and professionals, and thus the most sensitive and acceptable ways to make this information available requires further investigation. (shrink)

This paper considers the claim that perceptual experience is “transparent”, in the sense that nothing other than the apparent public objects of perception are available to introspection by the subject of such experience. I revive and strengthen the objection that blurred vision constitutes an insuperable objection to the claim, and counter recent responses to the general objection. Finally the bearing of this issue on representationalist accounts of the mind is considered.

An attempt is made to pinpoint the way in which perception is related to belief. Although, for familiar reasons, it is not true to say that we necessarily believe in the existence of the objects we perceive, nor that they actually have their ostensible characteristics, it is argued that the relation between perception and belief is more than merely contingent.There are two main issues to address. The first is that ‘collateral’ beliefs may impede perceptual belief. It is argued that this (...) still assigns an essential role to belief in perception, though the belief may be of an attenuated form. The second is Fred Dretske’s claim that even attenuated belief may be entirely absent from perception. It is argued that ‘non-epistemic’ perception can be understood only by employing the concept of ‘epistemic’ perception; that the former can occur only partially---i.e., within perceptions that are otherwise epistemic; and that by switching attention from the perception of objects to the Phenomenological tradition’s concern with the perception of world, we can see that perception must be entirely permeated with ‘doxastic’ force. (shrink)

An attempt is made to pinpoint the way in which perception is related to belief. Although, for familiar reasons, it is not true to say that we necessarily believe in the existence of the objects we perceive, nor that they actually have their ostensible characteristics, it is argued that the relation between perception and belief is more than merely contingentThere are two main issues to address. the first is that ‘collateral’ beliefs may impede perceptual belief. It is argued that this (...) still assigns an essential role to belief in perception, though the belief may be of an attenuated form. the second is Fred Dretske's claim that even attenuated belief may be entirely absent from perception. It is argued that (a) ‘non‐epistemic’perception can be understood only by employing the concept of ‘epistemic’perception; (b) that the former can occur only partially—i.e., within perceptions that are otherwise epistemic; and (c) that by switching attention from the perception of objects to the Phenomenological tradition's concern with the perception of world, we can see that perception must be entirely permeated with ‘doxastic’force. (shrink)

This paper, which has both a historical and a polemical aspect, investigates the view, dominant throughout the eighteenth and nineteenth centuries, that the sense of sight is, originally, not phenomenally three-dimensional in character, and that we must come to interpret its properly two-dimensional data by reference to the sense of 'touch'. The principal argument for this claim, due to Berkeley, is examined and found wanting. The supposedly confirming findings concerning 'Molyneux subjects' are also investigated and are shown to be either (...) irrelevant or disconfirming. Recent investigations on infant and neonatal perception are discussed and are also found to be disconfirming. An innatist version of the theory is then considered and is shown to be undermined by the largely 'Gibsonian' character of early space-perception. Finally three recent arguments in favour of the theory - two from psychologists, one from a philosopher - are considered and answered. (shrink)

Disjunctivism is the focus of a lively debate spanning the philosophy of perception, epistemology, and the philosophy of action. Adrian Haddock and Fiona Macpherson present 17 specially written essays, which examine the different forms of disjunctivism and explore the connections between them.

A. Mark Smith - Seeing and Being Seen in the Later Medieval World: Optics, Theology, and Religious Life - Journal of the History of Philosophy 44:3 Journal of the History of Philosophy 44.3 473-474 Dallas G. Denery, II. Seeing and Being Seen in the Later Medieval World: Optics, Theology, and Religious Life. Cambridge Studies in Medieval Life and Thought , 63. Cambridge-New York: Cambridge University Press, 2005. Pp. x + 202. Cloth, $75.00. Among the metaphors we live by , (...) visual metaphors figure prominently in our common discourse about cognition. We are well aware, of course, that in claiming to "see" meanings or "view" ideas in certain lights, we are speaking figuratively. Yet the analogy between thinking and seeing is more than a linguistic artifact. Until the seventeenth century,.. (shrink)

Anselm of Canterbury, in his work Proslogion," originated the "ontological argument" for God's existence, famously arguing that "something than which nothing greater can be conceived," which he identifies with God, must actually exist, for otherwise something greater could indeed be conceived. Some commentators have claimed that although Anselm may not have been conscious of the fact, the Proslogion "as well as his Reply to Gaunilo" contains passages that constitute a second independent proof: a "modal ontological argument" that concerns the supposed (...) logical necessity of God's existence. Other commentators disagree, countering that the alleged second argument does not stand on its own but presupposes the conclusion of the first. Anselm's Other Argument "stakes an original claim in this debate, and takes it further. There is" a second a priori" argument in Anselm, A. D. Smith contends, but it is not the modal argument past scholars have identified. This second argument surfaces in a number of forms, though always turning on certain deep, interrelated metaphysical issues. It is this form of argument that in fact underlies several of the passages which have been misconstrued as statements of the modal argument. In a book that combines historical research with rigorous philosophical analysis, Smith discusses this argument in detail, finally defending a modification of it that is implicit in Anselm. This "other argument" bears a striking resemblance to one that Duns Scotus would later employ. (shrink)

An assessment is made of Rudolf Otto's criticisms of Friedrich Schleiermacher's claim that religious feeling is to be interpreted as essentially involving a feeling of absolute dependence. Otto's criticisms are divided into two kinds. The first suggest that a feeling a dependence, even an absolute one, is the wrong sort of feeling to locate at the heart of religious consciousness. It is argued that this criticism is based on misinterpretations of Schleiermacher's view, which is in fact much closer to Otto's (...) than the latter appreciated. The second kind of criticism suggests that the feeling of absolute dependence cannot play the foundational role assigned to it by Schleiermacher, since it is itself a secondary response. It is argued not only that Otto provides no justification for this criticism, but that Otto's own position is incoherent unless Schleiermacher's view is accepted. (shrink)

An interpretation of the work of Schleiermacher and Otto recently offered by Andrew Dole, according to which these two thinkers differed over the extent to which religion can be explained naturalistically, and over the sense in which the supernatural can be admitted, is examined and refuted. It is argued that there is no difference between the two thinkers on this issue. It is shown that Schleiermacher's claim that a supernatural event is at the same time a natural event does not (...) invite, but rather forecloses the possibility of, a naturalistic explanation of the event. It is further demonstrated that Otto, like Schleiermacher, denied the existence of supernatural events interpreted as events that infringe the laws of nature. (shrink)

In the first section I outline the theory of abstraction, discussing first its con- ceptual basis, then its psychological-epistemological basis, and last its causal basis. My purpose throughout is to show how these bases, and thus the theory itself, were not only paramountly Aristotelian, but also eminently sensible. In the second section I draw the perspectivist account of vision within the bounds of the theory of abstraction and show stage by stage how that account unfolds coherently within those bounds. This (...) procedure should make clear that what the perspecti- vists actually offered was less a scientific theory of light or vision than a scientifi- cally justified world view. (shrink)

One problem facing Hockney and Falco is the lack of evidence among optical sources to support their claim that artists used image-projection by the early 1400s. After all, if quattrocento artists knew about image-projection, they must have learned about it from experts in the field, and no one was more expert at the time than Perspectivist opticians. As I argue in this paper, however, Perspectivist reflection-analysis posed certain theoretical and conceptual constraints that would have prevented Perspectivist opticians from recognizing, much (...) less understanding, image-projection. Their silence on this matter is therefore not evidence against the Hockney-Falco thesis. (shrink)