The paper investigates the senses in which the world may be thought external, and argues that none of them supports doubt about the possibility of knowledge of the world. Scepticism sometimes depends on certain erroneous conceptions of perception, especially those which lead to belief in 'inner, representational states'. How we perceive things depends on the satisfaction of certain general conditions--on what concepts we have, on the kind of senses we have, and so on a kind of anthropocentricity; (...) but this does not prevent objectivity, even in the case of secondary qualities. (shrink)

A skeptic claims that I do not have knowledge of the external world. It has been thought that the skeptic reaches this conclusion because she employs unusually stringent standards for knowledge. But the skeptic does not employ unusually high standards for knowledge. Rather, she employs unusually restrictive standards of evidence. Thus, her claim that we lack knowledge of the external world is supported by considerations that would equally support the claim that we lack evidence for our (...) beliefs about the external world. These considerations do not threaten the truth of our ordinary attributions of evidence, however, for such attributions are context-sensitive in their semantics. It is argued that this solution to the problem of the external world enjoys all of the benefits, and suffers none of the problems, of other solutions to the problem of the external world. (shrink)

A skeptic claims that I do not have knowledge of the external world. It has been thought that the skeptic reaches this conclusion because she employs unusually stringent standards for knowledge. But the skeptic does not employ unusually high standards for knowledge. Rather, she employs unusually restrictive standards of evidence. Thus, her claim that we lack knowledge of the external world is supported by considerations that would equally support the claim that we lack evidence for our (...) beliefs about the external world. These considerations do not threaten the truth of our ordinary attributions of evidence, however, for such attributions are context‐sensitive in their semantics.It is argued that this solution to the problem of the external world enjoys all of the benefits. and suffers none of the problems, of other solutions to the problem of the external world. (shrink)

The need to prove the existence of the external world has been a subject that has concerned the rationalist philosophers, particularly Descartes and the empiricist philosophers such as John Locke, George Berkeley and David Hume. Taking the epoché as the key mark of the phenomenologist—the suspension of the question of the existence of the external world—the issue of the external world should not come under the domain of the phenomenologist. Ironically, however, I would like (...) to suggest that it could be argued that the founder of the phenomenological school of thought, Edmund Husserl, also did not avoid the question of the existence of the external world. What I would like to suggest further is that Immanuel Kant grants himself illicit access to the external world and thus illustrates that the question of the external world is vital to the argument structure of the first Critique. (shrink)

Heidegger says concerning the question of the possibility of a proof of the existence of an external world that ‘the “scandal of philosophy” is not that this proof has yet to be given, but that such proofs are expected and attempted again and again’. Heidegger thinks this because our being is in the world, and this is something which Descartes for one failed to appreciate. I am not concerned here to answer the question whether Heidegger's own views (...) on these matters will do, though I think that they will not. Indeed they might well be said to beg the question at issue, in that Heidegger starts from the presumption that we are actually in the world, even if we are not in it in the way in which the tree in the garden is. Another way of reacting to Heidegger would be to say that he does not treat the fact and force of scepticism seriously enough when he makes that presumption. After all, it is possible for us to raise sceptical doubts about the existence of a world apart from ourselves, while it is not possible for the tree in the garden to act similarly. Hence, even if we make the presumption that we are in the world, as Heidegger insists, we are in it in a way that leaves untouched the possibility of sceptical doubts about what that world and our being in it are like. It might, logically, be the case, for example, that the world consists of just me and that my being in the world is no more than for me just to exist. In other words, my being in the world does not directly entail that there exists a world apart from me. (shrink)

This chapter examines Russell’s appreciation of the relevance of psychology for the theory of knowledge, especially in connection with the problem of the external world, and the background for this appreciation in British philosophy of the eighteenth and nineteenth centuries. Russell wrote in 1914 that “the epistemological order of deduction includes both logical and psychological considerations.” Indeed, the notion of what is “psychologically derivative” played a crucial role in his epistemological analysis from this time. His epistemological discussions (...) engage psychological factors in the perception of external objects that had been closely examined in the nineteenth century, among other places in J. S. Mill’s response to William Hamilton’s conception of knowledge of the external world. These considerations came to Russell in various ways, including his contact with British Empiricism (Mill, with Berkeley, Hume, and Reid as background), his engagement with Austrian philosophy, his close acquaintance with the philosophy and psychology of William James, and his exposure to contemporary British writings concerning the problem of the external world. The latter writings provide a crucial context within which natural scientific psychology came to be seen as distinct from epistemology and yet as relevant to its concerns. (shrink)

How does the mind attribute external causes to internal sensory experiences? Adam Smith addresses this question in his little known essay ‘Of the External Senses.’ I closely examine Smith's various formulations of this problem and then argue for an interpretation of his solution: that inborn perceptual mechanisms automatically generate external attributions of internal experiences. I conclude by speculating that these mechanisms are best understood to operate by simulating tactile environments.

This book offers solutions to two persistent and I believe closely related problems in epistemology. The first problem is that of drawing a principled distinction between perception and inference: what is the difference between seeing that something is the case and merely believing it on the basis of what we do see? The second problem is that of specifying which beliefs are epistemologically basic (i.e., directly, or noninferentially, justified) and which are not. I argue that what makes a (...) belief a perceptual belief, or a basic belief, is not any introspectible feature of the belief but rather the nature of the cognitive system, or "module", that is causally responsible for the belief. Thus, even zombies, who in the philosophical literature lack conscious experiences altogether, can have basic, justified, perceptual beliefs. -/- The theories of perceptual and basic beliefs developed in the monograph are embedded in a larger reliabilist epistemology. I use this theory of basic beliefs to develop a detailed reliabilist theory: Inferentialist Reliabilism, which offers a reliabilist theory of inferential justification and which solves some longstanding problems for other reliabilist views by demanding inferential support for some—but not all—beliefs. The book is an instance of a thoroughgoingly naturalistic approach to epistemology. Many of my arguments have an empirical basis, and the view that I endorse reserves a central role for the cognitive sciences—in particular, cognitive neuroscience—in filling in the details of an applied epistemological theory. (shrink)

Kant's transcendental idealism is often praised for resolving antinomies and attacked for representationalism. Such an attitude prevailed even among Kant's contemporaries. As early as 1787 Friedrich Heinrich Jacobi noted that the "main advantage" of the doctrine that we cognize only appearances and not things in themselves is that it resolves the antinomical conflicts in which previous metaphysics was embroiled and thus "sets reason at rest." Yet, at the same time, Jacobi bemoaned that the transcendental idealist cannot consistently uphold the positive (...) consequences of his "transcendental ignorance" without likewise accepting the negative consequence that his doctrine is tantamount to "speculative egoism,"1 insofar .. (shrink)

This paper is a sympathetic critique of the argument that Reichenbach develops in Chap. 2 of Experience and Prediction for the thesis that sense experience justifies belief in the existence of an external world. After discussing his attack on the positivist theory of meaning, I describe the probability ideas that Reichenbach presents. I argue that Reichenbach begins with an argument grounded in the Law of Likelihood but that he then endorses a different argument that involves prior probabilities. I (...) try to show how this second step in Reichenbach's approach can be strengthened by using ideas that have been developed recently for understanding causation in terms of the idea of intervention. (shrink)

This paper is a sympathetic critique of the argument that Reichenbach develops in Chap. 2 of Experience and Prediction for the thesis that sense experience justifies belief in the existence of an external world. After discussing his attack on the positivist theory of meaning, I describe the probability ideas that Reichenbach presents. I argue that Reichenbach begins with an argument grounded in the Law of Likelihood but that he then endorses a different argument that involves prior probabilities. I (...) try to show how this second step in Reichenbach’s approach can be strengthened by using ideas that have been developed recently for understanding causation in terms of the idea of intervention. (shrink)

In contrast to the recent trend of taking external world skepticism as a narrow problem for a demanding conception of "objective" or "certain" knowledge about the world, my thesis offers a re-examination of the distinctively perceptual basis of the skeptical problem. On my view the skeptic challenges the very possibility of rationally justifying beliefs in so far as they are based on sense experience, a characterization that helps to explain the continuity into the modern period (...) of the ancient skeptical challenge to the pretensions of reason. What is newly radical in external world skepticism is the discovery of the inner realm of the mind, and hence, of inner states as a component of every sense experience. ;I argue that the skeptic relies upon a distinctive, intuitively compelling, conception of sense experience which I call the causal model of experience. This is the view that experience is constituted by self-standing subjective experiences and their external causes, where cause and effect are logically distinct existences. The causal model is not to be identified with a view of perception as epistemically mediated by a "veil of ideas", though it can lead one to embrace that doctrine. My aim is twofold: to understand the motivation for the skeptic's causal model of experience; and to show that, when thought through, this model can ultimately be shown to be incoherent. ;The causal model has its roots in 17th century scientific metaphysics and the idea that the world can be exhaustively explained in terms of mechanical interactions between primary-qualified corpuscles governed by mathematically describable laws. I argue that the perceptual relation is not a mere efficient causal relation and I show that the skeptic is in the incoherent position of wanting a "private" language to describe his subjective experiences despite insisting on conditions of autonomy that deprive his terms of the normativity that is a necessary condition of meaning. Thus I do not answer the skeptical problem so much as undercut the basis upon which it is posed in the first place. (shrink)

Many philosophers believe that the traditional problem of our knowledge of the external world was dissolved by Wittgestein and others. They argue that it was not really a problem - just a linguistic `confusion' that did not actually require a solution. Bruce Aune argues that they are wrong. He casts doubt on the generally accepted reasons for putting the problem aside and proposes an entirely new approach. By considering the history of the problem from (...) Descartes to Kant, Aune shows that analogous arguments create difficulties for the contemporary philosophical consensus. He makes it clear that the problem remains acute, particualarly for our understanding of scientific evidence. The solution he proposes draws upon contemporary philosophy of science and probability theory. (shrink)

Many philosophers believe that the traditional problem of our knowledge of the external world was dissolved by Wittgestein and others. They argue that it was not really a problem - just a linguistic `confusion' that did not actually require a solution. Bruce Aune argues that they are wrong. He casts doubt on the generally accepted reasons for putting the problem aside and proposes an entirely new approach. By considering the history of the problem from (...) Descartes to Kant, Aune shows that analogous arguments create difficulties for the contemporary philosophical consensus. He makes it clear that the problem remains acute, particualarly for our understanding of scientific evidence. The solution he proposes draws upon contemporary philosophy of science and probability theory. (shrink)

The inaugural volume of the Pitt-Konstanz series, devoted to the work of philosopher Adolf Grünbaum, encompasses the philosophical problems of space, time, and cosmology, the nature of scientific methodology, and the foundations of psychoanalysis.

The main task of the paper is to show Bachtin's rendering the "external" and the "internal" problematic in his Marxism and the Philosophy of Language, by which he meant the pertaining limits between ourselves and the world, between the individual - psychological and the social. The author argues, that these are not two distinctive contradictory spheres: according to Bachtin the "internal" is always organized by the "external" i. e. the independence of the former is denied. He supposes (...) that the consciousness is determined by its embodiment in a sign. The consciousness is not constitutive of being, it is rather an immanent part of it, one of its powers. (shrink)

The phenomena of perception have been used by philosophers to kindle and fuel doubts about the reality of ‘the external world’, a phrase which points roughly in the direction of our natural environment. After grappling with problems, which trade under this title, one often discovers that the issues have less to do with the reality of anything which might be called ‘the external world’ and more to do with the reality of the problems themselves. In this (...) paper I propose to examine three approaches to what might deserve to be labelled, ‘problems about theexternal world’. (shrink)

The phenomena of perception have been used by philosophers to kindle and fuel doubts about the reality of ‘the external world’, a phrase which points roughly in the direction of our natural environment. After grappling with problems, which trade under this title, one often discovers that the issues have less to do with the reality of anything which might be called ‘the external world’ and more to do with the reality of the problems themselves. In this (...) paper I propose to examine three approaches to what might deserve to be labelled, ‘problems about theexternal world’. (shrink)

Now, considering the determinism or indeterminism of the world, ... The question of free will, and the mind-body problem, are two that come to mind. ...

(No abstract is available for this citation).

I give a brief precis of Lyons' book. I discuss the problem of delineating basic from non-basic beliefs. I argue that one of Lyons' possible solutions doesn't work - his definition of a perceptual module does not allow us to decide which beliefs are basic. And I argue that another possible solution undermines some of Lyons' motivation. The intuitive understanding of belief may not generate the Clairvoyancy troubles he fears.

In this paper I explore the little-known first debate, in 1914–19, between John Dewey and Bertrand Russell over the problem of the external world. After outlining their respective arguments, I show how Dewey’s criticisms of Russell miss the mark. Although these thinkers largely speak past one another, I argue that Dewey’s theory of inference is not only crucial to this exchange but also reveals what is at stake in their disagreement. Unfortunately, Dewey himself never explicitly invoked his (...) account of inference during this short-lived and ultimately fruitless exchange with Russell. Had he done so, the crucial issue of their differing criteria of justification would have been raised and their exchange could have been more productive. (shrink)

The problem of how we can know the existence and nature of the world external to our mind is one of the oldest and most difficult in philosophy. The discussion by John Locke (1632-1704) of knowledge of the external world have proved to be some of the most confusing and difficult passages of his entire body of philosophical work.

The phenomena of perception have been used by philosophers to kindle and fuel doubts about the reality of ‘the external world’, a phrase which points roughly in the direction of our natural environment. After grappling with problems, which trade under this title, one often discovers that the issues have less to do with the reality of anything which might be called ‘the external world’ and more to do with the reality of the problems themselves. In this (...) paper I propose to examine three approaches to what might deserve to be labelled, ‘problems about theexternal world’. (shrink)

This paper compares the claims about our knowledge of the external world presented by Rudolf Carnap, in the book known as the Aufbau, to those of Clarence Irving Lewis, in Mind and the World-Order. This comparison is made in terms of the opposition to Kantian epistemology that both books establish; the Aufbau is regarded as the peak of the logicist tradition and Mind and the World-Order is taken in continuity with pragmatism. It is found that both (...) books present knowledge of the external world as a consequence of a structural organization of human experience. However, there is an important point of divergence: the concept of verification each author adopts is different, such a concept was even a matter of discussion between Lewis and the Vienna Circle. This paper shows this disagreement but also shows how Carnap changed his point of view in the decade after the Aufbau was published, towards a standpoint which is much closer to Lewis’s ideas. In that process, nevertheless, Carnap changed his focus and did not deal with the problem of the external world anymore. This paper also seeks to draw attention to some features of the relation between Carnap and the pragmatist tradition which have only recently started to attract interest. (shrink)

In this paper I call attention to the fact that Lonergan gives two radically opposed accounts of how sense perception relates us to the external world and of how we know that this relation exists. I argue that the position that Lonergan characteristically adopts is not the one implied by what is most fundamental in his theory of cognition. I describe the initial epistemic position with regard to the problem of skepticism about the external material (...) class='Hi'>world that is in fact implied by his theory of cognition, and I sort out some confusion about various forms of direct and representative perceptual realism. The paper concludes with a critique of Lonergan’s theory of description and explanation in empirical science that makes evident the difficulties into which he is led by lack of clarity in his theory of perception. (shrink)

In this paper I call attention to the fact that Lonergan gives two radically opposed accounts of how sense perception relates us to the external world and of how we know that this relation exists. I argue that the position that Lonergan characteristically adopts is not the one implied by what is most fundamental in his theory of cognition. I describe the initial epistemic position with regard to the problem of skepticism about the external material (...) class='Hi'>world that is in fact implied by his theory of cognition, and I sort out some confusion about various forms of direct and representative perceptual realism. The paper concludes with a critique of Lonergan’s theory of description and explanation in empirical science that makes evident the difficulties into which he is led by lack of clarity in his theory of perception. (shrink)

The inaugural volume of the series, devoted to the work of philosopher Adolf Grünbaum, encompasses the philosophical problems of space, time, and cosmology, the nature of scientific methodology, and the foundations of psychoanalysis.

Conscious experience of the sensation of smell provides exemplars of the sensation exhibiting to us what it is like. These exemplars of experiences can become vehicles or terms of representation and meaning. I call this exemplar representation and the process exemplarization. The notion of exemplarization is indebted to Hume and Goodman. I modify the notion here to apply to the sensation of smell. Exemplar representation differs from verbal representation because the exemplar, like a sample, exhibits what the represented items smell (...) like, a perfume, a spice, or an animal. The exemplar represents the sensation and, at the same, represents external objects, my example is the spray of a skunk, by exhibiting what a skunk smells like. The exemplar is part of the meaning and conception of the external object. This solves the problem, as Reid insisted, of how experience of smell justifies perceptual belief in the existence of external objects. The meaning of thought and discourse about external objects is not exhausted by the exemplarization of the sensation of smell, but the exemplar becomes evidence of their existence as part of the meaning of what they smell like. The evidence and justification of the exemplar is fallible and defeasible. However, exemplar justification, when undefeated by error in the way it coheres with a background system, becomes knowledge of the external world. (shrink)

Moore’s proof consists of the inference of both “Two hands exist at this moment” and “At least two external objects exist at this moment” from the premise “Here is one hand and here is another.” The paper claims that the proof succeeds in refuting both idealism (“There are no external objects”) and skepticism (“Nobody knows that there are external objects”). The paper defends Moore’s proof against the following objections: Idealism does not deny that there is an (...) class='Hi'>external world so Moore’s proof is beside the point; Moore may be mistaken about the premise; Moore has failed to prove the premise; Moore has failed to show how he knows the premise; the proof leads to an infinite regress; the proof begs the question because the premise assumes what needs to be proved; the premise depends upon a shaky inference; the premise rests upon evidence of the senses and thus begs the question; the proof fails to convince the skeptic. (shrink)

본고는 흄의 외부 세계 현존 문제에 대한 비판적 재구성을 꾀한다. 흄은 그의 주저 『인성론』 1권, 4부, 2절 논의(“감관들에 관련된 회의주의에 대해서Of Scepticism with Regard to the Senses”)에서 지금까지도 계속 철학자들의 골치를 썩이는 이 문제를 다룬다. 하지만 흄의 논의는 필요 이상으로 장황하고 복잡다단하며 불분명한 탓에, 일단 먼저 그가 제시한 논증을 차례대로 좇아서 살피기 전에 논증의 전 구조를 망라하는 그림이 필요하다. 따라서 본고에서 필자는, 첫째, 외부 세계 현존 문제를 위한 흄의 논증 기저에 놓인 근본적 사유틀을 압축해서 드러낸다. 둘째, 이러한 사유틀을 기초로 해서 (...) 발현된 흄의 논증에 깃든 다양한 문제점들을 살핀다. 필자는 흄의 논증에 대한 비판을 면밀하게 수행하는 과정에서 김효명 교수가 『영국경험론』 제5장 말미(pp.152-162.)에서 흄의 견해를 줄곧 따라서 보인 해석이 직면하는 어려움도 보인다. 셋째, 지금까지 검토한 내용을 바탕으로, 결국 흄은 그의 자연주의를 지탱하는 능력에 일관되게 호소하면서 외부 세계 현존 문제에 대한 의미 있는 (즉, 존재론적 차원의 논의를 심리학적 차원의 논의로 전환하는) 답변을 제시하고자 하지만, 그의 노력은 그가 매우 의도성 짙게 ‘지각’과 ‘대상’을 상호 무분별히 뒤섞어서 쓰는 사정에 기인하기 때문에 논의에 일관성이 없으며, 이러한 비일관적 상황이 초래하는 결과는 그의 인간학에 대한 근원적 회의로 나타남이 지적될 것이다. (shrink)

The need to control violent and non-violent harm has been central to human existence since societies first emerged. This book analyses the problem of harm in world politics which stems from the fact that societies require the power to harm in order to defend themselves from internal and external threats, but must also control the capacity to harm so that people cannot kill, injure, humiliate or exploit others as they please. Andrew Linklater analyses writings in moral and (...) legal philosophy that define and classify forms of harm, and discusses the ways in which different theories of international relations suggest the power to harm can be controlled so that societies can co-exist with the minimum of violent and non-violent harm. Linklater argues for new connections between the English School study of international society and Norbert Elias' analysis of civilizing processes in order to advance the study of harm in world politics. (shrink)

In this paper I will draw attention to an important route to external world skepticism, which I will call confidence skepticism. I will argue that we can defang confidence skepticism (though not a meeker ‘argument from might’ which has got some attention in the 20th century literature on external world skepticism) by adopting a partially psychologistic answer to the problem of priors. And I will argue that certain recent work in the epistemology of mathematics and (...) logic provides independent support for such psychologism. (shrink)

In this paper, I compare and contrast two kinds of scepticism, Cartesian scepticism about the external world and Quinean scepticism about meaning. I expose Quine's metaphysical claim that there are no facts of the matter about meaning as a sceptical response to a sceptical problem regarding the possibility of our knowledge of meanings. I argue that this sceptical response is overkill; for the sceptical problem about our knowledge of meanings may receive a treatment similar to the (...) naturalistic treatment Quine himself offered for the problem of our knowledge of the external world. Further, I suggest that a naturalistic treatment of Quinean meaning scepticism may fare better than Quine's own naturalistic treatment of external world scepticism. (shrink)

For some time there have been appearing in the philosophical literature hints and suggestions that the so-called “problem of the external world” should be abandoned, not primarily because it is of little pragmatic significance, but rather because there is really no such problem to be solved. The publication of Reichenbach's Experience and Prediction has now stimulated a resurgence of these suggestions. In the course of his discussion of the book in the April Philosophy of Science Professor (...) Ernest Nagel has taken occasion to argue briefly that this problem, which Reichenbach attempts to solve, cannot even be stated unless one assumes its solution. And in a similar vein more recently Dr. William Barrett has also criticized Reichenbach and has then gone on to present certain fundamental logical considerations which, it is alleged, guarantee that the expression “Is there an external world?” cannot designate a legitimate philosophical problem. The situation, as he describes it, is as follows. The sentence “There is an external world” or the equivalent sentence “There is a physical object” can be confirmed in a physicalistic language only if one assumes the existence of certain physical objects. This procedure is of course circular. These sentences cannot therefore be confirmed, and, since the verifiability theory of meaning is accepted, the questions derived by transferring them into the interrogative mood cannot be meaningfully asked. A similar result is asserted to follow if one employs a perception language for science in place of a physicalistic language, since there is a parallelism between these two languages such that for every expression in the one there will be a corresponding expression in the other. (shrink)

The problem of induction is to validate inferences from some experiences or data to others. By experiences or data I mean such things as red patches, sounds, tastes, pains. Distinctions between private and public data, between internal and external impressions, between data and objects, are not epistemologically primitive or given but are modes of categorizing the given. The application of categories and the construction of objects are cases of, and so presuppose the validity of, induction.To hypostatize a construction, (...) or a system of constructions, is in fact to generate what may be called an external world. Examples are physical objects, and scientific objects. And when analysis proceeds, as it often does, by replacing the original subject by constructs, a hierarchy of external systems is generated. Thus, physical objects—e.g., our bodies—are external to data, and scientific objects are external to physical objects. (shrink)

Research on autonomy exhibits a constellation of variegated perspectives, from the problem of the crude deprivation of it to the study of the distinction between personal and moral autonomy, and from the problem of the role of a “self as narrator”, who classifies its own actions as autonomous or not, to the importance of the political side and, finally, to the need of defending and enhancing human autonomy. My precise concern in this article will be the examination of (...) the role of the human cognitive processes that give rise to the most important ways of tracking the external world and human behavior in their relationship to some central aspects of human autonomy, also to the aim of clarifying the link between autonomy and the ownership of our own destinies. I will also focus on the preservation of human autonomy as an important component of human dignity, seeing it as strictly associated with knowledge and, even more significantly, with the constant production of new and pertinent knowledge of various kinds. I will also describe the important _paradox of autonomy_, which resorts to the fact that, on one side, cognitions (from science to morality, from common knowledge to philosophy, etc.) are necessary to be able to perform autonomous actions and decisions because we need believe in rules that justify and identify our choices, but, on the other side, these same rules can become (for example, as a result of contrasting with other internalized and approved moral rules or knowledge contents) oppressive norms that diminish autonomy and can thus, paradoxically, defeat agents’ autonomous capacity “to take ownership”. (shrink)

Questions concerning perception are as old as the field of philosophy itself. Using the first-person perspective as a starting point and philosophical documents, the study examines the relationship between knowledge and perception. The problem is that of how one knows what one immediately perceives. The everyday belief that an object of perception is known to be a material object on grounds of perception is demonstrated as unreliable. It is possible that directly perceived sensible particulars are mind-internal images, shapes, sounds, (...) touches, tastes and smells. According to the appearance/reality distinction, the world of perception is the apparent realm, not the real external world. However, the distinction does not necessarily refute the existence of the external world. We have a causal connection with the external world via mind-internal particulars, and therefore we have indirect knowledge about the external world through perceptual experience. The research especially concerns the reasons for George Berkeley’s claim that material things are mind-dependent ideas that really are perceived. The necessity of a perceiver’s own qualities for perceptual experience, such as mind, consciousness, and the brain, supports the causal theory of perception. Finally, it is asked why mind-internal entities are present when perceiving an object. Perception would not directly discern material objects without the presupposition of extra entities located between a perceiver and the external world. Nevertheless, the results show that perception is not sufficient to know what a perceptual object is, and that the existence of appearances is necessary to know that the external world is being perceived. However, the impossibility of matter does not follow from Berkeley’s theory. The main result of the research is that singular knowledge claims about the external world never refer directly and immediately to the objects of the external world. A perceiver’s own qualities affect how perceptual objects appear in a perceptual situation. (shrink)

Questions concerning perception are as old as the field of philosophy itself. Using the first-person perspective as a starting point and philosophical documents, the study examines the relationship between knowledge and perception. The problem is that of how one knows what one immediately perceives. The everyday belief that an object of perception is known to be a material object on grounds of perception is demonstrated as unreliable. It is possible that directly perceived sensible particulars are mind-internal images, shapes, sounds, (...) touches, tastes and smells. According to the appearance/reality distinction, the world of perception is the apparent realm, not the real external world. However, the distinction does not necessarily refute the existence of the external world. We have a causal connection with the external world via mind-internal particulars, and therefore we have indirect knowledge about the external world through perceptual experience. The research especially concerns the reasons for George Berkeley’s claim that material things are mind-dependent ideas that really are perceived. The necessity of a perceiver’s own qualities for perceptual experience, such as mind, consciousness, and the brain, supports the causal theory of perception. Finally, it is asked why mind-internal entities are present when perceiving an object. Perception would not directly discern material objects without the presupposition of extra entities located between a perceiver and the external world. Nevertheless, the results show that perception is not sufficient to know what a perceptual object is, and that the existence of appearances is necessary to know that the external world is being perceived. However, the impossibility of matter does not follow from Berkeley’s theory. The main result of the research is that singular knowledge claims about the external world never refer directly and immediately to the objects of the external world. A perceiver’s own qualities affect how perceptual objects appear in a perceptual situation. (shrink)

McDermid clarifies the nature of Santayana’s scepticism by examining his response to the traditional sceptical problem of the external world. The chapter explains in what sense we can regard Santayana as a sceptic and in what sense Santayana is a critic of the sceptical method promulgated by Descartes.

Contextualist responses to skepticism about the external world are inadequate, and we should prefer an invariantist response to skepticism. There are two kinds of contextualism---anti-theoretical and theoretical. Anti-theoretical contextualists argue that the principles on which skepticism depends are absent from our ordinary epistemic ways of thinking. So anti-theoretical contextualists conclude that the burden of proof is on the skeptic. But some argue that the principles on which skepticism depends are not absent from our ordinary ways of thinking. The (...) existence of this unresolved dispute suggests that anti-theoretical contextualists have not shifted the burden of proof to the skeptic. Anti-theoretical contextualists also fail to refute skepticism outright. Their primary argument here is one in which the notion of certainty plays a key role. But their argument is unsound on all significant uses of the word 'certain.' Thus, anti-theoretical contextualists have neither refuted skepticism nor shifted the burden of proof to the skeptic. ;Theoretical contextualism claims that the solution to skeptical puzzles lies in the fact that the standards for knowledge shift from context to context. Yet if theoretical contextualist solutions are to be adequate, they must explain how those standards shift. Unfortunately, theoretical contextualism fails to provide this explanation. This explanatory failure, along with the problems that face individual theoretical contextualist accounts, shows that theoretical contextualist responses to skepticism are inadequate. ;Even though contextualism fails, a Moorean invariantism---according to which the standards for knowledge are always low---allows us to know across contexts the things we ordinarily take ourselves to know. We should prefer this Moorean invariantism over contextualism. It stands on the same theoretical ground as the dominant contextualisms while still allowing us to explain how we know that certain skeptical hypotheses are false. Also, contextualism raises questions---for example, questions concerning how the standards for knowledge shift---that receive only inadequate answers. The Moorean invariantist account does not raise such questions. All of this suggests that the Moorean invariantist response to skepticism is better than any of its contextualist counterparts. (shrink)

_ Source: _Volume 7, Issue 3, pp 147 - 172 The Indian Buddhist philosopher Vasubandhu has seldom been considered in conjunction with the problem of external-world skepticism despite the fact that his text, _Twenty Verses_, presents arguments from ignorance based on dreams. In this article, an epistemological phenomenalist interpretation of Vasubandhu is supported in opposition to a metaphysical idealist interpretation. On either interpretation, Vasubandhu gives an invitation to the problem of external-world skepticism, although his (...) final conclusion is closer to skepticism on the epistemological phenomenalist interpretation. The article ends with reflections on what light Vasubandhu might shed on the issue of whether skepticism is a natural problem in epistemology as well as why, despite Vasubandhu, the skeptical problem was not a central issue in the later Indian tradition. (shrink)