Online research in philosophy

Jonathan Weinberg (2007) has argued that we should not appeal to intuition as evidence because it cannot be externally corroborated. This paper argues for the normative claim that Weinberg’s demand for external corroboration is misguided. The idea is that Weinberg goes wrong in treating philosophical appeal to intuition analogous to the appeal to evidence in the sciences. Traditional practice is defended against Weinberg’s critique with the argument that some intuitions are true simply in virtue of being intuited by the majority (...) of people. The argument proceeds by way of examining a paradigm case, Putnam’s Twin Earth. (shrink)

In this paper I argue against Twin-Earth externalism. The mistake that Twin Earth arguments rest on is the failure to appreciate the force of the following dilemma. Some features of things around us do matter for the purposes of conceptual classification, and others do not. The most plausible way to draw this distinction is to see whether a certain feature enters the cognitive perspective of the experiencing subject in relation to the kind in question or not. (...) If it does, we can trace conceptual differences to internal differences. If it doesn’t, we do not have a case of conceptual difference. Neither case supports Twin Earth externalism. (shrink)

A number of philosophers defend naturalistic moral realism by appeal to an externalist semantics for moral predicates. The application of semantic externalism to moral predicates has been attacked by Terence Horgan and Mark Timmons in a series of papers that make use of their “Moral Twin Earth” thought experiment. In response, several defenders of naturalistic moral realism have claimed that the Moral Twin Earth thought experiment is misleading and yields distorted and inaccurate semantic intuitions. If they (...) are right, the intuitions generated by Moral Twin Earth cannot be appealed to in arguments against externalist moral semantics. The most developed case against the Moral Twin Earth argument that follows this strategy is found in a paper by Stephen Laurence, Eric Margolis and Angus Dawson. Here I argue that their attack on the Moral Twin Earth thought experiment fails. Laurence, Margolis and Dawson have not shown that we have reason to distrust the semantic intuitions it generates. (shrink)

This article is concerned with Mark Timmons and Terence Horgan's influential twin-earth argument against the semantic views of that school of thought in metaethics that has come to be known as “Cornell realism”. The semantic views of Cornell realism have been developed in greatest detail by Richard Boyd, and it is Boyd's view that is targeted by Timmons and Horgan. In the first part of the article, the twin-earth argument is introduced and two versions of it (...) are disentangled. Thereafter, a defensive strategy is developed against the most powerful version of the argument. The conclusion of the article is that Timmons and Horgan's argument does not succeed in showing that the semantic views associated with Cornell realism are false. (shrink)

Terence Horgan and Mark Timmons's Moral Twin Earth thought experiment poses a serious challenge for an influential kind of moral realism. It presents us with a case in which it is intuitive that two speakers are expressing a substantive disagreement with one another. However, the meta-semantics associated with this relevant form of moral realism entails that the speakers' moral predicates express different semantic contents, and thus, the moral sentences they utter do not express conflicting propositions. Consequently, this variety (...) of moral realism implies, wrongly, that the speakers do not express substantive disagreement after all. Some philosophers have objected to the Moral Twin Earth argument on the grounds that is possible for two speakers to express disagreement with one another, even if the moral sentences they utter do not express conflicting propositions. Heimer Geirsson supports this claim by appeal to the distinction between semantic reference and speaker reference. David Merli supports the same claim by noting that speakers whose moral sentences do not express conflicting propositions may nevertheless express a non-moral, practical disagreement over what to do. In this article, I argue that neither Geirsson nor Merli provides moral realists with a satisfying response to the Moral Twin Earth argument. (shrink)

Intentional states represent. Belief represents how we take things to be; desire represents how we would like things to be; and so on. To represent is to make a division among possibilities; it is to divide the possibilities into those that are consistent with how things are being represented to be and those that are not. I will call the possibilities consistent with how some intentional state represents things to be, its content. There is no suggestion that this is the (...) only legitimate notion of content, but for anyone who takes seriously the representational nature of intentional states, it must be one legitimate and central notion of content. To discover that DNA has a double helix structure is to make a selection from the various possible structures. (shrink)

In Chapters 4 and 5 of his 1998 book From Metaphysics to Ethics: A Defence of Conceptual Analysis, Frank Jackson propounds and defends a form of moral realism that he calls both ‘moral functionalism’ and ‘analytical descriptivism’. Here we argue that this metaethical position, which we will henceforth call ‘analytical moral functionalism’, is untenable. We do so by applying a generic thought-experimental deconstructive recipe that we have used before against other views that posit moral properties and identify them with certain (...) natural properties, a recipe that we believe is applicable to virtually any metaphysically naturalist version of moral realism. The recipe deploys a scenario we call Moral Twin Earth. (shrink)

In order to rebut G. E. Moore’s open question argument, ethical naturalists adopt a theory of direct reference for our moral terms. T. Horgan and M. Timmons have argued that this theory cannot be applied to moral terms, on the ground that it clashes with competent speakers’ linguistic intuitions. While Putnam’s Twin Earth thought experiment shows that our linguistic intuitions confirm the theory of direct reference, as applied to ‘water’, Horgan and Timmons devise a parallel thought experiment about (...) moral terms, in order to show that this theory runs against our linguistic intuitions about such terms. My claim is that the Horgan–Timmons argument does not work. I concede that their thought experiment is a good way to test the applicability of the theory of direct reference to moral terms, and argue that the upshot of their experiment is not what they claim it is: our linguistic intuitions about Moral Twin Earth are parallel to, not different from, our intuitions about Twin Earth. (shrink)

I say that it’s philosophically inexpensive because I think it is more convincing than any other Twin-Earth thought experiment in that it sidesteps many of the standard objections to the usual thought experiments. I also briefly discuss narrow contents and give an analysis of Putnam’s original argument.

It is widely believed that Twin-Earth-style thought experiments show that the contents of a person's thoughts fail to supervene on her intrinsic properties. Several recent philosophers have made the further claim that Twin-Earth-style thought experiments produce metaphysically necessary conditions for the possession of certain concepts. I argue that the latter view is false, and produce counterexamples to several proposed conditions. My thesis is of particular interest because it undermines some attempts to show that externalism is incompatible (...) with privileged access. (shrink)

In a series of articles, Terry Horgan and Mark Timmons have argued that Richard Boyd’s defence of moral realism, utilizing a causal theory of reference, fails. Horgan and Timmons construct a twin Earth-style thought experiment which, they claim, generates intuitions inconsistent with the realist account. In their thought experiment, the use of (allegedly) moral terms at a world is causally regulated by some property distinct from that regulating their use here on Earth; nevertheless, Horgan and Timmons claim, (...) it is intuitive that the inhabitants of this world disagree with us in their moral claims. Since any disagreement would be merely verbal were the alleged moral facts identical to or constituted by different natural facts, the identity or constitution claim must be false. I argue that their argument fails. Horgan and Timmons’ thought experiment is underdescribed; when we fill out the details, I claim, we shall see that the challenge to moral realism fades away. I sketch two possible interpretations of the (apparently) moral claims of the inhabitants of moral Twin Earth. On one interpretation, they fail to disagree with us because they actually agree with us; on the other, they fail to disagree with us because they are not moralizers at all. Which interpretation is true, I argue, will depend on the facts that explain the differences between us and the inhabitants of moral twin Earth. (shrink)

A popular form of virtue epistemology—defended by such figures as Ernest Sosa, Linda Zagzebski and John Greco—holds that knowledge can be exclusively understood in virtue-theoretic terms. In particular, it holds that there isn't any need for an additional epistemic condition to deal with the problem posed by knowledge-undermining epistemic luck. It is argued that the sustainability of such a proposal is called into question by the possibility of epistemic twin earth cases. In particular, it is argued that such (...) cases demonstrate the need for virtue-theoretic accounts of knowledge to appeal to an independent epistemic condition which excludes knowledge-undermining epistemic luck. (shrink)

Hilary Putnam's Twin Earth thought experiment has come to have an enormous impact on contemporary philosophical thought. But while most of the discussion has taken place within the context of the philosophy of mind and language, Terence Horgan and Mark Timmons (H8cT) have defended the intriguing suggestion that a variation on the original thought experiment has important consequences for ethics.' In a series of papers, they' ve developed the idea of a Moral Twin Earth and have (...) argued that its significance is that it has the resources to undermine naturalistic versions of moral realism.' H8t T don't hold back in their assessment. "Moral Twin.. (shrink)

This paper is structured as follows. First, it offers a brief presentation of the Twin Earth thought experiment. Second, it offers an interpretation of Putnam'santi-realism. Third, it argues for the incompatibility of anti-realism and the semantic role of extension that Twin Earth is supposed to establish.

In his recent book Physicalism, Daniel Stoljar argues that there is no version of physicalism that is both true and deserving of the name. His argument employs a variation of Hilary Putnam’s famous twin-earth story, which Stoljar calls “the twin-physics world.” In this paper, I challenge Stoljar’s use of the twin-physics world. The upshot of that challenge, I argue, is that Stoljar fails to show, concerning the versions of physicalism for which he grants the possibility of (...) being true, that none of them is deserving of the name. (shrink)

Suppose that you had always had a physical twin, Chris, who on a different planet went through life having physical characteristics, sensory experiences, utterances, and brain processes exactly the same as yours in every physical and sensory respect. Chris.

Scientific essentialism is the view that some necessities (e.g., water = H2O) can be known only with the aid of empirical science. The thesis of the paper is that scientific essentialism does not extend to the central questions of philosophy and that these questions can be answered a priori. The argument is that the evidence required for the defense of scientific essentialism (e.g., twin earth intuitions) is reliable only if the intuitions required by philosophy to answer its central (...) questions is also reliable. Included is an outline of a modal reliabilist theory of basic evidence and a concept-possession account of the reliability of a priori intuition. (shrink)

J. L. Mackie argued that if there were objective moral properties or facts, then the supervenience relation linking the nonmoral to the moral would be metaphysically queer. Moral realists reply that objective supervenience relations are ubiquitous according to contemporary versions of metaphysical naturalism and, hence, that there is nothing especially queer about moral supervenience. In this paper we revive Mackie's challenge to moral realism. We argue: (i) that objective supervenience relations of any kind, moral or otherwise, should be explainable rather (...) than sui generis; (ii) that this explanatory burden can be successfully met vis-à-vis the supervenience of the mental upon the physical, and in other related cases; and (iii) that the burden cannot be met for (putative) objective moral supervenience relations. (shrink)

In “The Meaning of ‘Meaning’” Putnam argues, among other things, that “‘meanings’ just ain’t in the head”. Putnam’s central arguments in favor of this conclusion are unsound. The arguments in question are the famous intra‐world Twin Earth arguments, given on pages 223‐ 227 of the article in question.

The aim of this paper is to assess the relationship between anti-physicalist arguments in the philosophy of mind and anti-naturalist arguments in metaethics, and to show how the literature on the mind-body problem can inform metaethics. Among the questions we will consider are: (1) whether a moral parallel of the knowledge argument can be constructed to create trouble for naturalists, (2) the relationship between such a "Moral Knowledge Argument" and the familiar Open Question Argument, and (3) how naturalists can respond (...) to the Moral Twin Earth argument. We will give particular attention to recent arguments in the philosophy of mind that aim to show that anti-physicalist arguments can be defused by acknowledging a distinctive kind of conceptual dualism between the phenomenal and the physical. This tactic for evading anti-physicalist arguments has come to be known as the Phenomenal Concept Strategy. We will propose a metaethical version of this strategy, which we shall call the `Moral Concept Strategy'. We suggest that the Moral Concept Strategy offers the most promising way out of these anti-naturalist arguments,though signi cant challenges remain. (shrink)

There have been times in the history of ethical theory, especially in this century, when moral realism was down, but it was never out. The appeal of this doctrine for many moral philosophers is apparently so strong that there are always supporters in its corner who seek to resuscitate the view. The attraction is obvious: moral realism purports to provide a precious philosophical good, viz., objectivity and all that this involves, including right answers to (most) moral questions, and the possibility (...) of knowing those answers. In the last decade, moral realism has re-entered the philosophical ring in powerful-looking naturalistic form. ln this paper we provide a dialectical overview: we situate the new wave position itself, and also our objections to it, in the context of the evolving program of philosophical naturalism in 20th century analytic philosophy. We seek to show that although this new contender might initially look like championship material, it succumbs to punches surprisingly similar to those that knocked out the old-fashioned versions of naturalist moral realism. (shrink)

Many still seem confident that the kind of semantic theory Putnam once proposed for natural kind terms is right. This paper seeks to show that this confidence is misplaced because the general idea underlying the theory is incoherent. Consequently, the theory must be rejected prior to any consideration of its epistemological, ontological or metaphysical acceptability. Part I sets the stage by showing that falsehoods, indeed absurdities, follow from the theory when one deliberately suspends certain devices Putnam built into it , (...) presumably in order to block such entailments. Part II then raises the decisive issue of at what cost these devices do the job they need to do. It argues that - apart from possessing no other motivation than their capacity to block the consequences derived in Part I - they only fulfil this blocking function if they render the theory unable to deal with fiction and related 'make-believe' activities. Part III indicates the affinity Putnam's account has with the classically 'denotative' view of meaning, and thus how its weaknesses may be seen as a variant of the classical weakness of 'denotative' approaches. It concludes that the theory is a conceptual muddle. (shrink)

Terry Horgan and Mark Timmons have recently presented a series of papers in which they argue against what has come to be called the ‘new wave’ moral realism and moral semantics of David Brink, Richard Boyd, Peter Railton, and a number of other philosophers. The central idea behind Horgan and Timmons’s criticism of these ‘new wave’ theories has been extended by Sean Holland to include the sort of realism that drops out of response-dependent accounts that make use of an analogy (...) between moral properties and secondary qualities. This paper argues that Holland’s extension depends crucially on the fact that his target is a direct response-dependent account of moral value. His argument does not work against such accounts of more basic normative notions such as ‘harm’ or ‘benefit’. And these more basic notions may then serve as the basic normative building blocks for an indirectly response-dependent moral theory. (shrink)

At the beginning of the twentieth century, G. E. Moore’s open question argument convinced many philosophers that moral statements were not equivalent to statements made using non-moral or descriptive terms. For any non-moral description of an object or object it seemed that competent speakers could without confusion doubt that the action or object was appropriately characterized using moral terms such as ‘good’ or ‘right’. The question of whether the action or object so described was good or right was always open, (...) even to competent speakers. In the absence of any systematic theory to explain the possibility of synthetic as opposed to analytic identities, many were convinced this demonstrated that moral properties could not be identified with any natural (or supernatural) properties. Thus Moore and others concluded that moral properties such as goodness were irreducible sui generis properties, not identical to natural.. (shrink)

Mark Timmons and Terry Horgan have argued that the new moral realism, which rests on the causal theory of reference, is untenable. While I do agree that the new moral realism is untenable, I do not think that Timmons and Horgan have succeeded in showing that it is. I will lay out the case for new moral realism and Horgan and Timmons’ argument against it, and then argue that their argument fails. Further, I will discuss Boyd’s semantic theory as well (...) as attempts to improve upon it, raise serious problems for these semantic accounts, and suggest an alternative view that accounts for our use of moral terms. (shrink)

This volume will acquaint novice philosophers with one of the most important debates in twentieth-century philosophy, and will provide seasoned readers with a ...

A content of a subject's mental state is narrow when it is determined by the subject's intrinsic properties: that is, when any possible intrinsic duplicate of the subject has a corresponding mental state with the same content. A content of a subject's mental state is..

It is argued that, because of scientific essentialism, two currently popular arguments against the mind-body identity thesis -- the multiple-realizability argument and the Nagel-Jackson knowledge argument -- are unsatisfactory as they stand and that their problems are incurable. It is then argued that a refutation of the identity thesis in its full generality can be achieved by weaving together two traditional Cartesian arguments -- the modal argument and the certainty argument. This argument establishes, not just the falsity of the identity (...) thesis, but also the metaphysical possibility of disembodiment. (shrink)

One type of deflationism about metaphysical modality suggests that it can be analysed strictly in terms of linguistic or conceptual content and that there is nothing particularly metaphysical about modality. Scott Soames is explicitly opposed to this trend. However, a detailed study of Soames’s own account of modality reveals that it has striking similarities with the deflationary account. In this paper I will compare Soames’s account of a posteriori necessities concerning natural kinds with the deflationary one, specifically Alan Sidelle’s account, (...) and suggest that Soames’s account is vulnerable to the deflatonist’s critique. Furthermore, I conjecture that both the deflationary account and Soames’s account fail to fully explicate the metaphysical content of a posteriori necessities. Although I will focus on Soames, my argument may have more general implications towards the prospects of providing a meaning-based account of metaphysical modality. (shrink)

This paper considers the problem of assigning meanings to empty natural kind terms. It does so in the context of the Twin-Earth externalist-internalist debate about whether the meanings of natural kind terms are individuated by the external physical environment of the speakers using these terms. The paper clarifies and outlines the different ways in which meanings could be assigned to empty natural kind terms. And it argues that externalists do not have the semantic resources to assign them meanings. (...) The paper ends on a sceptical note concerning the fruitfulness of using the Twin-Earth setting in debates about the semantics of empty natural kind terms. (shrink)

This is my expository and critical review of Jerry Fodor's Psychosemantics. See also Callaway 1992, Meaning Holism and Semantic Realism.

Moral non-cognitivists hope to explain the nature of moral agreement and disagreement as agreement and disagreement in non-cognitive attitudes. In doing so, they take on the task of identifying the relevant attitudes, distinguishing the non-cognitive attitudes corresponding to judgments of moral wrongness, for example from attitudes involved in aesthetic disapproval or the sports fan’s disapproval of her team’s performance. We begin this paper by showing that there is a simple recipe for generating apparent counterexamples to any informative specification of the (...) moral attitudes. This may appear to be a lethal objection to non-cognitivism, but a similar recipe challenges attempts by non-cognitivism’s competitors to specify the conditions underwriting the contrast between genuine and merely apparent moral disagreement. Because of its generality, this specification problem requires a systematic response, which, we argue, is most easily available for the non-cognitivist. Building on premisses congenial to the non-cognitivist tradition, we make the following claims: (1) In paradigmatic cases, wrongness-judgements constitute a certain complex but functionally unified state, and paradigmatic wrongness-judgments form a functional kind, preserved by homeostatic mechanisms. (2) Because of the practical function of such judgements, we should expect judges’ intuitive understanding of agreement and disagreement to be accommodating, treating states departing from the paradigm in various ways as wrongness-judgements. (3) This explains the intuitive judgements required by the counterexample-generating recipe, and more generally why various kinds of amoralists are seen as making genuine wrongness-judgements. (shrink)

The present paper has three aims. The first and foremost aim is to introduce into philosophy of mind and related areas (philosophy of language, etc) a discussion of Slow Earth, an analogue to the classic Twin Earth scenario that features a difference from aboriginal Earth that hinges on time instead of the distribution of natural kinds. The second aim is to use Slow Earth to call into question the central lessons often alleged to flow from (...) consideration of Twin Earth, lessons having to do with relations of minds to spatially definable boundaries of bodies such as skin or skull. The third aim is to suggest a puzzle for adherents of cognitive content externalism having to do with the metaphysical requirements on slow-switching, a hypothetical process whereby changes in the relations between subjects and their environments are followed by gradual changes in cognitive contents. (shrink)

Introduction: Middle-Earth, The lord of the rings, and international relations -- Order, justice, and Middle-Earth -- Thinking about international relations and Middle-Earth -- Middle-Earth and three great debates in international relations -- Middle-Earth, levels of analysis, and war -- Middle-Earth and feminist theory -- Middle-Earth and feminist analysis of conflict -- Middle-Earth as a source of inspiration and enrichment -- Conclusion: international relations and our many worlds.

Anthills and aardvarks -- The illusion of independence -- The myth of the master species -- Why law and jurisprudence matter -- The conceit of law -- Respecting the great law -- Remembering who we are -- The question of rights -- Elements of Earth governance -- Seeking Earth jurisprudence -- The rhythms of life -- The law of the land -- A communion of communities -- Transforming law and governance -- The mountain path.

The first of my works about a New Copernican Revolution, the shift from matter, and matter/energy to consciousness, and I go on to spell out a new Heaven, a new Universe, a new Earth, and a new Humanity.

Metaethics is a perennially popular subject, but one that can be challenging to study and teach. As it consists in an array of questions about ethics, it is really a mix of (at least) applied metaphysics, epistemology, philosophy of language, and mind. The seminal texts therefore arise out of, and often assume competence with, a variety of different literatures. It can be taught thematically, but this sample syllabus offers a dialectical approach, focused on metaphysical debate over moral realism, which spans (...) the century of debate launched and framed by G. E. Moore's Principia Ethica. The territory and literature are, however, vast. So, this syllabus is highly selective. A thorough metaethics course might also include more topical examination of moral supervenience, moral motivation, moral epistemology, and the rational authority of morality. Authors Recommend: Alexander Miller, An Introduction to Contemporary Metaethics (Cambridge: Polity Press, 2003). This is one of the few clear, accessible, and comprehensive surveys of the subject, written by someone sympathetic with moral naturalism. David Brink, Moral Realism and the Foundations of Ethics (Cambridge: Cambridge University Press, 1989). Brink rehabilitates naturalism about moral facts by employing a causal semantics and natural kinds model of moral thought and discourse. Michael Smith, The Moral Problem (Oxford: Blackwell, 1994). Smith's book frames the debate as driven by a tension between the objectivity of morality and its practical role, offering a solution in terms of a response-dependent account of practical rationality. Gilbert Harman and Judith Jarvis Thomson, Moral Relativism & Moral Objectivity (Cambridge, MA: Blackwell, 1996). Harman argues against the objectivity of moral value, while Thomson defends it. Each then responds to the other. Frank Jackson, From Metaphysics to Ethics (Oxford: Clarendon Press, 1998). Jackson argues that reductive conceptual analysis is possible in ethics, offering a unique naturalistic account of moral properties and facts. Mark Timmons, Morality without Foundations (Oxford: Oxford University Press, 1999). Timmons distinguishes moral cognitivism from moral realism, interpreting moral judgments as beliefs that have cognitive content but do not describe moral reality. He also provides a particularly illuminating discussion of nonanalytic naturalism. Philippa Foot, Natural Goodness (New York, NY: Oxford University Press, 2001). A Neo-Aristotelian perspective: moral facts are natural facts about the proper functioning of human beings. Russ Shafer-Landau, Moral Realism: A Defence (New York, NY: Oxford University Press, 2003). In this recent defense of a Moorean, nonnaturalist position, Shafer-Landau engages rival positions in a remarkably thorough manner. Terence Cuneo, The Normative Web (New York, NY: Oxford University Press, 2007). Cuneo argues for a robust version of moral realism, developing a parity argument based on the similarities between epistemic and moral facts. Mark Schroeder, Slaves of the Passions (New York, NY: Oxford University Press, 2007). Schroeder defends a reductive form of naturalism in the tradition of Hume, identifying moral and normative facts with natural facts about agents' desires. Online Materials: PEA Soup: http://peasoup.typepad.com A blog devoted to philosophy, ethics, and academia. Its contributors include many active and prominent metaethicists, who regularly post about the moral realism and naturalism debates. Metaethics Bibliography: http://www.lenmanethicsbibliography.group.shef.ac.uk/Bib.htm Maintained by James Lenman, professor of philosophy at the University of Sheffield, this online resource provides a selective list of published research in metaethics. Stanford Encyclopedia of Philosophy: http://plato.stanford.edu See especially the entries under 'metaethics'. Sample Syllabus: Topics for Lecture & Discussion Note: unless indicated otherwise, all the readings are found in R. Shafer-Landau and T. Cuneo, eds., Foundations of Ethics: An Anthology (Malden: Blackwell, 2007). (FE) Week 1: Realism I (Classic Nonnaturalism) G. E. Moore, Principia Ethica, 2nd ed. (FE ch. 35). W. K. Frankena, 'The Naturalistic Fallacy,'Mind 48 (1939): 464–77. S. Finlay, 'Four Faces of Moral Realism', Philosophy Compass 2/6 (2007): 820–49 [DOI: [DOI link]]. Week 2: Antirealism I (Classic Expressivism) A. J. Ayer, 'Critique of Ethics and Theology' (1952) (FE ch. 3). C. Stevenson, 'The Nature of Ethical Disagreement' (1963) (FE ch. 28). Week 3: Antirealism II (Error Theory) J. L. Mackie, 'The Subjectivity of Values' (1977) (FE ch. 1). R. Joyce, Excerpt from The Myth of Morality (2001) (FE ch. 2). Week 4: Realism II (Nonanalytic Naturalism) R. Boyd, 'How to be a Moral Realist' (1988) (FE ch. 13). P. Railton, 'Moral Realism' (1986) (FE ch. 14). T. Horgan and M. Timmons, 'New Wave Moral Realism Meets Moral Twin Earth' (1991) (FE ch. 38). Week 5: Antirealism III (Contemporary Expressivism) A. Gibbard, 'The Reasons of a Living Being' (2002) (FE ch. 6). S. Blackburn, 'How To Be an Ethical Anti-Realist' (1993) (FE ch. 4). T. Horgan and M. Timmons, 'Nondescriptivist Cognitivism' (2000) (FE ch. 5). W. Sinnott-Armstrong, 'Expressivism and Embedding' (2000) (FE ch. 37). Week 6: Realism III (Sensibility Theory) J. McDowell, 'Values and Secondary Qualities' (1985) (FE ch. 11). D. Wiggins, 'A Sensible Subjectivism' (1991) (FE ch. 12). Week 7: Realism IV (Subjectivism) & Antirealism IV (Constructivism) R. Firth, 'Ethical Absolutism and the Ideal Observer' (1952) (FE ch. 9). G. Harman, 'Moral Relativism Defended' (1975) (FE ch. 7). C. Korsgaard, 'The Authority of Reflection' (1996) (FE ch. 8). Week 8: Realism V (Contemporary Nonnaturalism) R. Shafer-Landau, 'Ethics as Philosophy' (2006) (FE ch. 16). T. M. Scanlon, What We Owe to Each Other (Cambridge, MA: Harvard University Press, 1998), ch. 1. T, Cuneo, 'Recent Faces of Moral Nonnaturalism', Philosophy Compass 2/6 (2007): 850–79 [DOI: [DOI link]]. (shrink)

Since Twin Earth was discovered by American philosophical-space explorers in the 1970s, the domain of.

Moral realists can, and should, allow that the truth-conditional content of moral judgments is in part attitudinal. I develop a two-dimensional semantics that embraces attitudinal content while preserving realist convictions about the independence of moral facts from our attitudes. Relative to worlds “considered as counterfactual,” moral terms rigidly track objective, response-independent properties. But relative to different ways the actual world turns out to be, they nonrigidly track whatever properties turn out to be the objects of our relevant attitudes. This theory (...) provides realists with a satisfactory account of Moral Twin Earth cases and an improved response to Blackburn’s supervenience argument. (shrink)

‘Water is H2O’ is one of the most frequently cited sentences in analytic philosophy, thanks to the seminal work of Saul Kripke and Hilary Putnam in the 1970s on the semantics of natural kind terms. Both of these philosophers owe an intellectual debt to the empiricist metaphysics of John Locke's Essay Concerning Human Understanding, while disagreeing profoundly with Locke about the reality of natural kinds. Locke employs an intriguing example involving water to support his view that kinds (or ‘species’), such (...) as water and gold, are the workmanship of the human mind. This is the point of his story about a winter visitor to England from Jamaica, who is astonished to find that the water in his basin has turned solid overnight, and proceeds to call it ‘hardened water’. Locke criticizes this judgement, maintaining that it is more consonant with common sense to regard water and ice as different kinds of substance. Putnam, by implication, disagrees. Deploying his imaginary example of Twin Earth—a distant planet where a watery-looking substance, XYZ, rather than H2O, fills the oceans and rivers—he maintains that common sense supports the judgement that XYZ and H2O, despite their superficial similarity, are not the same kind of substance, precisely because their molecular compositions are different. Here it will be argued that both views are mistaken, but that, in this dispute, Locke has more right on his side than his modern opponents do. (shrink)

(1) Is content in the head? I believe that water is wet. My twin on Twin Earth, which is just like Earth except that H2O is replaced by the superficially identical XYZ, does not. His thoughts concern not water but twin water: I believe that water is wet, but he believes that twin water is wet. It follows that that what a subject believes is not wholly determined by the internal state of the believer. (...) Nevertheless, the cognitive similarities between me and my twin are striking. Is there some wholly internal aspect of content that we might share? (shrink)

Twin-earth thought experiments, standardly construed, support the externalist doctrine that the content of propositional attitudes involving natural-kind terms supervenes upon properties external to those who entertain them. But this doctrine in conjunction with a common view of self-knowledge might have the intolerable consequence that substantial propositions concerning the environment could be knowable a priori. Since both doctrines, externalism and privileged self-knowledge, appear independently plausible, there is then a paradox facing the attempt to hold them concurrently. I shall argue, (...) however, that externalist claims about the dependence of content on environmental factors presuppose certain theses about the semantics of natural-kind terms that, if sound, would make those claims eligible for empirical justification instead. In fact, that is the only interpretation of their epistemic status that could square with the standard conclusion from twin-earth cases. Furthermore, it can be shown to solve the paradox of externalism and self-knowledge in a more doxastically conservative way--accommodating precisely each of the well-accepted intuitions about knowledge, closure and the individuation of content given up by available competitors. (shrink)

The issue of methodological solipsism in the philosophy of mind and psychology has received enormous attention and discussion in the decade since the appearance Jerry Fodor's "Methodological Solipsism" [Fodor 1980]. But most of this discussion has focused on the consideration of the now infamous "Twin Earth" type examples and the problems they present for Fodor's notion of "narrow content". I think there is deeper and more general moral to be found in this issue, particularly in light of Fodor's (...) more recent defense of his view in Psychosemantics [Fodor 1987]. Underlying this discussion are questions about the nature and plausibility of the claim that scientific explanation should observe a constraint of methodological individualism . My goal in what follows is to bring out this more general problem in Fodor's "internalist" account of the mental. (shrink)

In response to Kripke's modal argument contemporary descriptivists suggest that referring terms, e.g., ‘water’, are synonymous with actually-rigidified definite descriptions, e.g., ‘the actual watery stuff’. Following Scott Soames, this strategy has the counterintuitive consequence that possible speakers on Perfect Earth cannot be ascribed water-beliefs without beliefs about the actual world. Co-indexing the actuality and possibility operators has the equally untoward result that possible speakers on Twin Earth are ascribed water-beliefs. So, Soames's dilemma is that the descriptivist can (...) account for either Twin Earth or Perfect Earth but not both. In response, this paper argues that since ‘actual’ is an indexical, the content of water-beliefs is egocentric, and so if the descriptivist avails herself of relativized propositions as the content of such beliefs, she is able to account for both Twin Earth and Perfect Earth. The lesson is that we have to tread carefully when making inferences about the contents of beliefs from the semantics of belief-reporting sentences that contain actually-rigidified expressions. (shrink)

ONE way t0 defend narrow content is to produce a sentence 0f the form ‘S believes that P’, and show that this sentence is true 0f S if and 0nly if it is true 0f any duplicate from the skin in, any doppclgangcr, of S. N0toriously, this is hard to d0. Twin Earth examples are pervasivc.1 Another way to defend narrow content; is t0 show that Only 2. narrow notion can play thc causal explanatory r01c we require 0f (...) contcnt in 2. properly scicntiicm psychology 0r cognitive science. Notoriously, this is hard t0 d0. The considerations—mcthod010gicaI solipsism, the principle 0f autonomy, 0r what:cvcr—invokcd to show that a broad notion 0f content cannot.. (shrink)

In his latest book, The Elm and the Expert (1994), Fodor notoriously rejects the notion of narrow content as superfluous. He envisions a scientific intentional psychology that adverts only to broad content properties in its explanations. I argue that Fodor's change in view is only apparent and that his previous position (1985-1991) is extensionally equivalent to his "new" position (1994). I show that, despite what he says narrow content is for in his (1994), Fodor himself has previously never appealed to (...) the notion of narrow content in explaining Frege cases and cases involving the so-called deferential concepts. And for good reason: his notion of narrow content (1985-91) couldn't explain them. The only apparent change concerns his treatment of Twin Earth cases. However, I argue that the notion of broad content that his purely informational semantics delivers is, in some interesting sense, equivalent to the mapping notion of narrow content he officially gave up. For his pure informational semantics fails to avoid assigning disjunctive content to twins, since nomic covariations take care not only actual but also counterfactual contexts into account. I show that none of the attempts made by Fodor to block this consequence of his theory works. The present notion of broad content he now operates with is therefore in a position to take over all the important jobs that his previous notion of narrow content could do. (shrink)

The role of content in computational accounts of cognition is a matter of some controversy. An early prominent view held that the explanatory relevance of content consists in its supervenience on the the formal properties of computational states (see, e.g., Fodor 1980). For reasons that derive from the familiar Twin Earth thought experiments, it is usually thought that if content is to supervene on formal properties, it must be narrow; that is, it must not be the sort of (...) content that determines reference and truth-conditions. An interesting alternative to this view has recently been proposed by Egan (1995). According to Egan, the explanatory role of content is such that contents must in general be broad to be explanatorily relevant. But Egan’s view involves a non-realist interpretation of content assignments. I will argue here that this non-realism about contents is undermotivated. A realist variation on her view of the explanatory role of content, however, would survive this criticism. This realist variation, I suggest, shares with the views of other commentators on Marr’s theory (e.g., Burge 1986; Shapiro 1993; forthcoming) certain commitments concerning the supervenience base of visual contents and processes. I will argue, however, that these commitments beg important questions regarding the individuation of cognitive states and processes. I conclude, contrary to Burge and Shapiro, that Marr’s theory does not favor anti-individualism. (shrink)

Externalism about content is the view that the social and / or the physical environment contributes to determining the content of the beliefs of a person. The strongest argument for social externalism derives from the rule-following considerations that motivate a social theory of conceptual content. The best argument for physical externalism goes back to Putnam’s twin earth thought experiment. The aim of this paper is to point out that these two sorts of externalism give contradictory accounts of what (...) determines the conceptual content of our beliefs and individuates them. According to physical externalism, the physical environment is sufficient to perform that task owing to suitable causal relations. According to social externalism, the conceptual content of our beliefs is determined by us owing to certain social practices. Possible strategies to reconcile both these accounts are considered. (shrink)

In this paper I try to make as much sense aspossible of, first, the extensive philosophicalliterature concerned with the status of `Wateris H2O' and, second, the implications ofPutnam's invention of Twin Earth, anotherpossible world stipulated to be just like Earth, except that water is XYZ, notH2O.

Mental content and the problem of De Se belief -- Cognitive attitudes and content -- The doctrine of propositions -- The problem of De Se belief -- The property theory of content -- In favor of the property theory -- Perry's messy shopper and the argument from explanation -- Lewis's case of the two Gods -- Arguments from internalism and physicalism -- An inference to the best explanation -- Alternatives to the property theory -- The triadic view of belief -- (...) How the property theory and the triadic view are rivals -- Dyadic propositionalism reconsidered -- Arguments against the property theory -- Self-ascription and self-awareness -- Nonexistence and impossible contents -- Stalnaker's argument -- Propositionalist arguments from inference -- The property theory and De Re belief -- Lewis's account of De Re belief -- McKay's objection to Lewis -- Mistaken identity and the case of the shy secret admirer -- Some other worries and concluding remarks -- The property theory, rationality, and Kripke's puzzle about belief -- Kripke's puzzle about belief -- The puzzle argument -- A solution to the puzzle -- Puzzles with empty names and kind terms -- The property theory, twin earth, and belief about kinds -- Twin earth and two kinds of internalism -- The twin earth argument -- An internalist response (stage one) -- An internalist response (stage two) -- Self-ascription and belief about kinds. (shrink)

[Michael Tye] Externalism about thought contents has received enormous attention in the philosophical literature over the past fifteen years or so, and it is now the established view. There has been very little discussion, however, of whether memory contents are themselves susceptible to an externalist treatment. In this paper, I argue that anyone who is sympathetic to Twin Earth thought experiments for externalism with respect to certain thoughts should endorse externalism with respect to certain memories. /// [Jane Heal] (...) Tye claims that an externalist should say that memory content invoking natural kind concepts floats free of the setting where the memory is laid down and is at later times determined by the context in which the memory is revived. His argument assumes the existence of 'slow switching' of the meaning of natural kind terms when a person is transported from Earth to Twin Earth. But proper understanding of natural kind terms suggests that slow switching (contrary to what is often presupposed) is likely never to be completed. Hence the situation of a person unknowingly transported to Twin Earth is not that his memories switch content but rather that he gets two natural kinds confused. (shrink)

Abstract: This paper introduces and analyses the doctrine of externalism about semantic content; discusses the Twin Earth argument for externalism and the assumptions behind it, and examines the question of whether externalism about content is compatible with a privileged knowledge of meanings and mental contents.

Abstract: Two important thought-experiments are associated with the work of Hilary Putnam, one designed to establish multiple realizability for mental kinds, the other designed to establish essentialism for natural kinds. Comparing the thought-experiments with each other reveals that the scenarios in both are structurally analogous to each other, though his intuitions in both are greatly at variance, intuitions that have been simultaneously well received. The intuition in the former implies a thesis that prioritizes pre-scientific over scientific indicators for identifying mental (...) kinds in certain circumstances, while his intuition in the latter implies a converse thesis, prioritizing scientific over pre-scientific indicators for identifying natural kinds in analogous circumstances. In this paper I question whether we can consistently endorse both of these intuitions. A consideration is presented to attempt to justify the common intuition found in the multiple realization thought-experiment. Then it is argued that this same consideration has application in the structurally analogous Twin-Earth thought-experiment. This recommends a kind of multiple realization thesis for natural kinds, in opposition to a scientific essentialist approach. The various respects in which mental kinds like pain and natural kinds like water are similar to each other, such that similar philosophical treatments are warranted for both, are enumerated. (shrink)

: For quite some time now there has been an ongoing debate whether authoritative self-knowledge is compatible with anti-individualism.1 One influential line of argument against compatibilism is due to Paul Boghossian (1998). I argue that Boghossian misconstrues what the anti-individualist really is committed to. This defence of compatibilism is elaborated by showing how the Twin Earth thought experiment is meant to speak in favour of anti-individualism. Partly this will show that Boghossian is wrong in his denial that empirical (...) background knowledge is imported into the Twin Earth experiment. The main points argued are that Boghossian fails to realize, both, (1) that anti-individualism does not involve concept-individuation in terms of reference, and (2) that anti-individualism assumes a core of representational success. In effect, these two points constitute an entirely new way to defend compatibilism, a way that seems to have gone unnoticed in the literature. (shrink)

The contemporary popularity of semantic externalism has arisen from so-called Twin Earth thought experiments which suggest that the representational content of a natural kind term cannot be wholly determined by processes within a speaker's body. Such arguments depend on the intuition that the extensions of natural kind terms cannot have changed as the result of the scientific investigation of natural kinds' constitutions. I demonstrate that this externalist intuition depends on an assumption about the mentality of isomorphic doppelgangers which (...) has never been questioned but which is nonetheless arguably false. I develop an alternative view of the instantiation of mind which entails a revision of our understanding of the constitution of environmental objects. The picture seems to be fully coherent despite its oddity and I can find no good reason to reject it. The conclusion must be that the case for semantic externalism is thus less compelling than is often supposed. (shrink)

This paper argues that Twin Earth twins belong to the same psychological natural kind, but that the reason for this is not that the causal powers of mental states supervene on local neural structure. Fodor’s argument for this latter thesis is criticized and found to rest on a confusion between it and the claim that Putnamian and Burgean type relational psychological properties do not affect the causal powers of the mental states that have them. While it is true (...) that Putnamian and Burgean type relational psychological properties do not affect causal powers, it is false that no relational psychological properties do. Examples of relational psychological properties that do affect causal powers are given and psychological laws are sketched that subsume twins in virtue of them instantiating these relational properties rather than them sharing the narrow contents of their thoughts. (shrink)

According to a classical view in the philosophy of language, the reference of a term is determined by a property of the term which supervenes on the history of its use. A contrasting view is that a term's reference is determined by how it is properly interpreted, in accordance with certain constraints or conditions of adequacy on interpretations. Causal theories of reference of the sort associated with Hilary Putnam, Saul Kripke and Michael Devitt are versions of the first view, while (...) defenders of determination by interpretation theories include Donald Davidson, Daniel Dennett and John Haugeland. I use a variant of Putnam's Twin Earth thought experiment to argue against the first view generally, and causal theories of reference in particular, then go on to argue that properly-formulated version of the principle of charity can account for the intuitions that seem to support causal theories. Finally, I apply my version of interpretationism to the problem of reference to abstract objects and compare it with some of Wittgenstein's and Quine's views about language. (shrink)

The scales across which physical properties exist are vast and subtle in their effects on particular systems placed locally on such scales. For example, human experiential access is restricted only to partial segments of the mass density, size, and temperature scales of the universe. I argue that philosophers must learn to appreciate better the effects of physical scales. Specifically, thought experiments in philosophy should be more sensitive to physical scale effects, because the conclusion of a thought experiment may be undermined (...) by unintentionally ignored scale effects, and the changes required to obtain the foreground state of affairs in a thought experiment might require unacknowledged scale-spanning changes to the contextual background. I discuss four philosophical thought experiments: Putnam's Twin Earth and Brain in a Vat, Searle's Chinese Room, and Chalmers's Zombies Without Qualia. I close by briefly defending the greater interest and importance of physical possibility over logical possibility. (shrink)

Two-Factor conceptual role theories of mental content are often intended to allow mental representations to satisfy two competing requirements. One is the Fregean requirement that two representations, like public language expressions, can have different meanings even though they have the same reference (as in the case of ‘morning star’ and ‘evening star’). The other is Putnam's Twin-earth requirement that two representations or expressions can have the same conceptual role but differ in meaning due to differing references. But I (...) argue that the hidden agenda behind these theories is to make misrepresentation possible. A simple, one-factor conceptual role theory (like the "crude causal theory" Fodor describes) falls prey to the disjunction problem. If every use or application of a concept is meaning-determining, then there can be no misuse of that concept. Each use will partially determine its meaning, and, use which is covered in the meaning cannot be a misuse, error, or misrepresentation. I argue that the referential factor in two-factor conceptual role theories is what is supposed to make misrepresentation possible. But it fails to do so, because when the two factors do not determine the same meaning, there is no non-question-begging way to have one of them take precedence and force meaning to align with one factor and deviate from the other. (shrink)

[Michael Tye] Externalism about thought contents has received enormous attention in the philosophical literature over the past fifteen years or so, and it is now the established view. There has been very little discussion, however, of whether memory contents are themselves susceptible to an externalist treatment. In this paper, I argue that anyone who is sympathetic to Twin Earth thought experiments for externalism with respect to certain thoughts should endorse externalism with respect to certain memories. /// [Jane Heal] (...) Tye claims that an externalist should say that memory content invoking natural kind concepts floats free of the setting where the memory is laid down and is at later times determined by the context in which the memory is revived. His argument assumes the existence of 'slow switching' of the meaning of natural kind terms when a person is transported from Earth to Twin Earth. But proper understanding of natural kind terms suggests that slow switching (contrary to what is often presupposed) is likely never to be completed. Hence the situation of a person unknowingly transported to Twin Earth is not that his memories switch content but rather that he gets two natural kinds confused. (shrink)

Wayne Davis presents a highly original approach to the foundations of semantics, showing how the so-called "expression" theory of meaning can handle names and other problematic cases of nondescriptive meaning. The fact that thoughts have parts ("ideas" or "concepts") is fundamental: Davis argues that like other unstructured words, names mean what they do because they are conventionally used to express atomic or basic ideas. In the process he shows that many pillars of contemporary philosophical semantics, from twin earth (...) arguments to the necessity of identity, are unfounded. (shrink)

The subject of this paper is the debate between externalism and internalism about mental content presented by Tim Crane in Chapter 4 of his book Elements of Mind. Crane’s sympathies in this debate are with internalism. The paper attempts to show that Crane’s argumentation is not refuting the Twin Earth argument and externalism, and that in its basis it does not differ much from externalism itself Crane’s version of the argument for externalism features two key premises: (1) The (...) content of a thought determines what the thought is about/what it refers to (the Content Determines Reference Principle); and (2) Twins are referring to different things when they use the word “water”. From these, in a few simple steps, Crane’s externalist infers: Therefore, their thoughts are not “in their heads”. Crane suggests denying the Content Determines Reference Principle in the light of indexical thoughts. In the first stage, Crane reduces “content” to “some aspect of content”, although he needs all aspects of content to secure identity of thoughts. However, his view then comes close to something acceptable to externalists. In the second stage, Crane makes content relative to context, but then reference still determines content. (shrink)

Normative realists might be assumed to have few worries about semantics. After all, a realist might initially hope to simply adopt the best semantic theory about ordinary descriptive language. However, beginning with the non-cognitivist appropriation of the open question argument, a number of philosophers have posed serious objections to the realist’s ability to offer a plausible semantic theory. This paper introduces the two most influential semantic challenges to normative realism: the open question argument, and the Moral Twin Earth (...) argument. It explains the major replies to these challenges offered by realists, and locates these challenges within the broader debate over what sort of semantic theories might be plausible candidates for a normative realist to adopt. (shrink)

This dissertation is a critique of synthetic ethical naturalism (SEN). SEN is a view in metaethics that comprises three key theses: first, there are moral properties and facts that are independent of the beliefs and attitudes of moral appraisers (moral realism); second, moral properties and facts are identical to (or constituted only by) natural properties and facts (ethical naturalism); and third, sentences used to assert identity or constitution relations between moral and natural properties are expressions of synthetic, a posteriori necessities. (...) The last of these theses, which distinguishes SEN from other forms of ethical naturalism, is supported by a fourth: the semantic contents of the central moral predicates such as 'morally right' and 'morally good' are fixed in part by features external to the minds of speakers (moral semantic externalism). Chapter 1 introduces SEN and discusses the most common motivations for accepting it. The next three chapters discuss the influential "Moral Twin Earth" argument against moral semantic externalism. In Chapter 2, I defend this argument from the charge that the thought experiment upon which it depends is defective. In Chapters 3 and 4, I consider two attempts to amend SEN so as to render it immune to the Moral Twin Earth argument. I show that each of these proposed amendments amounts to an abandonment of SEN. Chapter Five explores Richard Boyd's proposal that moral goodness is a "homeostatic property cluster." If true, Boyd's hypothesis could be used to support several metaphysical, epistemological, and semantic claims made on behalf of SEN. I advance three arguments against this account of moral goodness. In the sixth chapter, I argue that moral facts are not needed in the best a posteriori explanations of our moral beliefs and moral sensibility. Because of this, those who accept a metaphysical naturalism ought to deny the existence of such facts or else accept skepticism about moral knowledge. In Chapter 7, I consider a counterargument on behalf of SEN to the effect that moral facts are needed in order to explain the predictive success of our best moral theories. I show that this argument fails. (shrink)

Owens (1993) argues that one cannot accept the anti-individualistic conclusions of arguments inspired by Twin Earth thought experiments and still maintain that folk psychological states causally explain behavior. Saidel (1994) has argued that Owens' argument illegitimately individuates the contents of folk psychological states widely and causal powers narrowly. He suggests that causal powers may well be wide, and that the conditions that militate in favor of wide content also militate in favor of wide causal powers; mutatis mutandis for (...) narrow content and narrow causal powers. I argue that these suggestions are in error, and hence that Saidel's criticism is ineffective. Owens' original point is therefore likely to stand. (shrink)

Owens (1993) argues that a tension exists between our commonsense view of mental states and the scientific view that psychological explanations not contradict supervenience. He suggests that one cannot accept the anti-individualistic conclusions of Twin-Earth thought experiments and continue to use folk psychological states to explain behavior. I argue that his conclusions are based on individuating content widely and causal powers narrowly, and that such individuation violates consistency assumptions about the terms of his discussion. Thus, I argue, the (...) tension he points to evaporates when we adopt either a consistently wide view or a consistently narrow view. (shrink)

One of the main arguments intended to show that content externalism undermines the privileged access thesis is the ‘slow switching argument’, originally proposed by Boghossian (). In this argument, it is supposed that a subject is unknowingly switched back and forth between Earth and Twin Earth: then it is claimed that, given externalism, when the subject is on Earth thinking that water is wet, he cannot know the content of his thought a priori, for he cannot, (...) by mere reflection, rule out the relevant alternative hypothesis that he is on Twin Earth thinking that twater is wet. One of the controversies surrounding this argument stems from the fact that it is not clear which epistemological principle underlies it. Here, I examine two suggestions made in the literature as to what that underlying principle might be. I argue that neither of these suggested principles is plausible, and thus that the slow switching argument never gets off the ground. (shrink)

Our heads are full of representations, according to cognitive science. It might seem inevitable that conscious states are a type of brain-based representation, but in this paper I argue that representation and consciousness each form conceptually distinct domains. Representational content depends on context, usually causal, as shown by familiar cases in which context varies while brain states do not -- twin earth cases and brains-in-vats, for example. But these same cases show that conscious content does not depend on (...) context. The vatted brain, for example, enjoys the same experiences as its in vivo counterpart. The structure of experience -- its parts and their distinctive characters -- is the dynamic structure of the brain, viewed "from within." I call this position methodological phenomenalism (MP), and consider its prospects as a foundation for a science of consciousness. I close with a consideration of MP on the subjective "character" of conscious states. Turning away from representation dissolves the perplexity of subjectivity, leaving hopeful prospects for the scientific study of consciousness. (shrink)

I defend the view that supervenience relations need not be explained. My view is that some supervenience relations are brute, and explanatorily ultimate. I examine an argument of Terrence Horgan and Mark Timmons. They aim to rehabilitate John Mackie’s metaphysical queerness argument. But the explanations of supervenience that Horgan and Timmons demand are semantic explanations. I criticize their attempt to explain psychophysical supervenience in this fashion. I then turn to their ‘Twin Earth’ argument against naturalist moral realism. I (...) reconstruct their argument in a charitable spirit. But then I show that the argument mutates into an epistemological argument. That is where the real problems for moral realism lie. (shrink)

A certain direction in cognitive science has been to try to “ground” public language statements in some species of mental representation. A central tenet of this trend is that communication – that is, public language – succeeds (when it does) because the elements of this public language are in some way correlated with mental items of both the speaker and the audience so that the mental state evoked in the audience by the use of that piece of public language is (...) the one that the speaker wanted to evoke. The “meaning”, therefore, of an utterance – and of the parts of an utterance, such as individual sentences and their parts, the individual words, etc. – is, in this view, some mental item. Successful communication requires that there be widespread agreement amongst speakers of the same public language as to the mental entities that are correlated with any particular public words. Such a view of meaning is variously called “internalist” or “cognitive” or “subjectivist” or “solipsistic” or (sometimes) “representationalist” (these terms having, however, further connotations which set them apart from one another in other ways), and can be found in a wide variety of writers who do not agree on many other things. It is opposed to views that take the meaning of an utterance to be an item of “reality,” however defined. In different writers this latter view is called “externalist” or “objectivist” or “realist” or (sometimes) “represent-ationalist,” always with the idea that there is something other (or at least, more) than the mental state of speakers and hearers that determines meaning. The literature is rife with arguments between internalists vs. externalists, subjectivists vs. objectivists, cognitivists vs. realists, on such topics as “truth” and “synonymy” and “twin earth” and “arthritis” (to mention only a few).. (shrink)

In a way that is rarely even attempted, and even more rarely actually pulled off, Susan Hurley, in her book Consciousness in Action, brings scientific ideas into contact with mainstream philosophy. It is not at all unusual for empirical results from cognitive science, psychology, and neuroscience to be raised in discussion of issues in philosophy of science and philosophy of mind--Dennett and the Churchlands, for example, have been doing so for years. But Hurley attempts to draw empirical results even closer (...) to the center of philosophy, using them to make points about metaphysics and epistemology more broadly, especially PutnamÂ’s Twin Earth cases. We are very fond of Hurley's book, and we agree with nearly all of her conclusions. We do think, though, that there are two important cases where Hurley has misunderstood scientific work. First, we think she misunderstand dynamical systems theory; second, we think her criticism of ecological psychology is misplaced. In neither case do these misunderstandings derail HurleyÂ’s overall project--indeed, the former of them makes her conclusions all the more plausible. We consider them in order. (shrink)