Horgan and Timmons have argued that our intuitions about the semantics of non-moral language and moral language differ, and that while twin-earth semantic intuitions generate one result in Putnam´s twater case, moral twin-earth fails to generate comparable results for moral terms. Horgan and Timmon´s conclude from this that the semantic norms governing the use of natural kind terms differ from the semantic norms governing the use of moral terms. I will argue that Horgan and Timmons’ (...) intuitive moral twin-earth argument fails to derail the new moral realism. Further, I will discuss Boyd’s semantic theory and raise problems for it that do not rely on the use of moral twin-earth. (shrink)

Horgan and Timmons, with their Moral Twin Earth arguments, argue that the new moral realism falls prey to either objectionable relativism or referential indeterminacy. The Moral Twin Earth thought experiment on which the arguments are based relies in crucial ways on the use of intuitions. First, it builds on Putnam’s well-known Twin Earth example and the conclusions drawn from that about the meaning of kind names. Further, it relies on the intuition that were Earthers and Twin Earthers (...) to meet, they would be able to have genuine moral disagreements. I will argue that the similarities with Putnam’s thought experiment are questionable and so the reliance on Putnam-like intuitions is questionable. I will then further argue that even if we accept the intuitions that Horgan and Timmons rely on, the anti-realist conclusion is not warranted due to there being more to the meaning of kind terms than the argument assumes. Once we develop the meaning of kind terms further we can acknowledge both that Earthers and Twin Earthers refer to different properties with their moral terms, and that in spite of that they can have a substantive disagreement due to a shared meaning component. (shrink)

This paper offers a simple response to the Moral Twin Earth (MTE) objection to Naturalist Moral Realism (NMR). NMR typically relies on an externalist metasemantics such as a causal theory of reference. The MTE objection is that such a theory predicts that terms like ‘good’ and ‘right’ have a different reference in certain twin communities where it’s intuitively clear that the twins are talking about the same thing when using ‘good’. I argue that Boyd’s causal regulation theory, the (...) original target of the MTE objection, was never vulnerable to this objection. The theory contains an epistemic constraint on reference which implies that either the property that causally regulates uses of ‘good’ isn’t different for the twin communities or, in scenarios where the reference is different, the communities diverge in ways where it’s not intuitively clear that ‘good’ has the same reference for them. (shrink)

Terence Horgan and Mark Timmons? Moral Twin Earth thought experiment shows that realist ethical naturalism entails a kind of conceptual relativism about moral predicates. This conceptual relativism implies, further, that Earthlings and Twin Earthlings do not express substantive disagreement with one another. Because this latter implication clashes with considered linguistic intuitions, Horgan and Timmons conclude that we should reject realist ethical naturalism. Against this, several critics recommend that realists ?bite the bullet? with respect to Moral Twin Earth: (...) despite our intuitions, we should accept that the speakers do not disagree. These critics argue that the intuitions elicited by the thought experiment are either the result of a failure on the part of readers to appreciate hidden details of the Moral Twin Earth case, or else they are mere artifacts of readers? epistemic limitations. In this paper, I show that the Moral Twin Earth argument prevails against this line of attack. (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)

A key objection to naturalistic versions of moral realism is that the (meta)semantics to which they are committed yields incorrect semantic verdicts about so-called Moral Twin Earth cases. Recently, it has been proposed that the Moral Twin Earth challenge can be answered by adopting a neo-Aristotelian semantics for moral expressions. In this paper, I argue that this proposal fails. First, however attractive the central claims of neo-Aristotelianism are, they do not for us have the status of (...) analytic constraints on the use of ethical expressions, as they must if they are to block Moral Twin Earth counterexamples. Second, even when the neo-Aristotelian’s claims are taken as non-negotiable analytic constraints, the semantics faces a dilemma: if characteristic human functioning is understood in an ethically neutral way, the semantics yields an incorrect intension for ‘good human.’ If human functioning is understood in an ethically partisan way, the semantics fails to avoid problematic Moral Twin Earth counterexamples. (shrink)

The Linguistic Account of Thought holds that thought is the meaning of declarative sentences. According to Linguistic Internalism, two languages can share sentential meanings and hence express the same thought. According to Linguistic Particularism, thought content is relative to languages and is not shared. We can contrast these two accounts of thought with a third: the intension of a thought is a common disciplinary use of differing meaningful claims, and the extension of a thought is the collection of sentences or (...) symbols that share a disciplinary use---a view inspired by Patanjali's Yoga, Linguistic Externalism. Having noted that the Linguistic Account of Thought is the defining feature of the Western tradition, underwriting the European philosophical tradition and work in Indology, I consider whether the competing accounts of thought can be tested. I note that the Moral Twin Earth thought experiment by Horgan and Timmons, assumes Linguistic Internalism and attempts to test competing accounts of moral semantics for their capacity to facilitate cross cultural communication on morals across different languages. I propose testing competing accounts of thought to the same end on Planet Ethics: here the moral semantics of a language simply is its national moral theory. So the literal meaning of “good” for Nation Kant would be “a will determined by the categorical imperative,” but for Nation Expressivism Kant it would an internalist semantics that allows speakers to express their minds. Nation Plato is ruled by a philosopher king, and "good" there means "the form of the forms," and for Nation Positive Utilitarians it means "maximal happiness" while for the Negative Utilitarians it means "minimal suffering." The scenario also contains with in it the Thems: they have their own Them language tied to their own moral tradition, but they also participate in the linguistic culture of their adopted homes. Can the citizens of Planet Ethics have a conversation about morals, and can they avoid Anti Thematism? I note that the two Linguistic Accounts of Thought cannot explain how moral conversations occur across languages on Planet Ethics. Each culture will try to use its own language as a frame to understand others, who will be incomprehensible in so far as they depart from the assumed linguistic frame: each culture will view itself as having the moral frame work. Worse, the linguistic accounts of thought render right answers to moral questions analytically true, and criticisms of the dominant moral theory a contradiction in terms. A community who cannot get along with each other can separate and make separate moral communities, each with its own national ethos and corresponding moral semantics, but then they will not be able to conceptualize their prior disagreement especially if both new languages are departures from the earlier shared moral semantics. Also, the Thems will be viewed with suspicion for not wholly and univocally supporting the national ethos of their adopted homes. Linguistic externalism has no problem accounting for moral discourse here or in allowing for intra cultural moral criticism: the common philosophical use of the diverse philosophical sentences is the common proposition on which speakers of the various languages can agree or disagree to. On Planet Ethics it becomes clear there is "right" moral semantics: all will do as well as each other. Whereas the Linguistic Account of Thought leads to an inflationary approach to linguistic meaning, the linguistic externalist option is deflationary with respect to linguistic meaning. Finally I note that the linguistic approach to thought underwrites Indological investigations into Indian ethics and I consider two Davidson inspired tweaks to save the linguistic approach. The upshot is that Orthodox Indologists, in practice, adopt the procedure that Davidson recommends for understanding malopropers, such as Archie Bunker. In short, Orthodox Indologists, in being wedded to the linguistic approach to thought, treat Indian philosophers like malapropers who can't speak Sanskrit, like Bunker cannot speak English without erring. All can be avoided by Linguistic Externalism. This means that the conceptual content of moral vocabulary is not their linguistic meaning, but their philosophical purpose. (shrink)

In this paper I revisit an important response to the Moral Twin Earth (MTE) challenge: The Common Functional Role strategy (CFR). I argue that CFR is open to a revenge problem. MTE-cases allegedly show that two linguistic communities can be in genuine disagreement even when they are regulated by distinct families of properties. CFR provides a way to reconcile the intuition that the two communities are in genuine disagreement with the claim that the use of moral terms by (...) both communities is causally regulated by different families of properties. This is done by identifying a functional role that those families of properties both fulfill. Still, even if CFR is successful, its proponents need to face a serious revenge problem. Roughly, it could be that the families of properties that regulate each community are equally perfect realizers of the relevant higher-order functional state. I suggest that the proponent of CFR faces a dilemma: either CFR has controversial implications about first-order moral theory, or CFR needs to be coupled with substantive and parochial empirical/metaphysical assumptions to avoid those implications. (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)

Terence Horgan and Mark Timmons have written a number of articles where they use their Moral Twin Earth thought experiment to attack the new moral realism. The new moral realism is based on advances made in the philosophy of language that allows us to introduce synthetic definitions of moral terms. The Moral Twin Earth thought experiment relies in crucial ways on the use of intuitions. Specifically, it relies on the intuitions that were Earthers and Twin (...) Earthers to meet, they would be able to have genuine moral disagreements. Horgan and Timmons rely on that intuition when they argue that the meaning of the relevant terms on Earth and Twin Earth must be the same. I will argue that we can accept that Earthers and Twin Earthers can have genuine moral disagreement while at the same time claim that the terms they use have different referents and so different semantic meaning. That is, having genuine disagreements does not require that the semantic meaning or the reference of the terms used in the debate being the same. (shrink)

What considerations place genuine constraints on an adequate semantics for normative and evaluative expressions? Linguists recognize facts about ordinary uses of such expressions and competent speakers’ judgments about which uses are appropriate. The contemporary literature reflects the widespread assumption that linguists don’t rely upon an additional source of data—competent speakers’ judgments about possible disagreement with hypothetical speech communities. We have several good reasons to think that such judgments are not probative for semantic theorizing. Therefore, we should accord these judgments no (...) probative value for the development of a semantics for our moral terms. Such judgments can no longer be presumed to put pressure on theories according to which our moral expressions share a semantics with ordinary, descriptive terms. Many rivals to pure, Descriptivist theories count among their advantages the ability to accommodate these judgments. If these judgments have no probative value, such theories lose an important source of support. (shrink)

What considerations place genuine constraints on an adequate semantics for normative and evaluative expressions? Linguists recognize facts about ordinary uses of such expressions and competent speakers’ judgments about which uses are appropriate. The contemporary literature reflects the widespread assumption that linguists don’t rely upon an additional source of data—competent speakers’ judgments about possible disagreement with hypothetical speech communities. We have several good reasons to think that such judgments are not probative for semantic theorizing. Therefore, we should accord these judgments no (...) probative value for the development of a semantics for our moral terms. Such judgments can no longer be presumed to put pressure on theories according to which our moral expressions share a semantics with ordinary, descriptive terms. Many rivals to pure, Descriptivist theories count among their advantages the ability to accommodate these judgments. If these judgments have no probative value, such theories lose an important source of support. (shrink)

This paper presents two cases demonstrating that theories allowing the environment to partially determine the content of moral concepts provide incorrect truth-conditions for moral terms. While typical Moral Twin Earth cases seek to establish that these theories fail to account formoral disagreement, neither case here essentially involves interpersonal disagreement. Both involve a single person retaining moral beliefs despite recognizing actual or potential mismatches with the purportedly content-determining facts. This lets opponents of such theories grant objections that (...) standard Moral Twin Earth cases fail to demonstrate disagreement, and argue more straightforwardly that they generate implausible truth-conditions for moral claims. (shrink)

In his 2013 Theoria article, “Unreliable Intuitions: A New Reply to the Moral Twin-Earth Argument,” Jorn Sonderholm attempts to undermine our moral twin earth argument against Richard Boyd's moral semantics by debunking the semantic intuitions that are prompted by reflection on the thought experiment featured in the MTE argument. We divide our reply into three main sections. In section 1, we briefly review Boyd's moral semantics and our MTE argument against this view. In section 2, we (...) set forth what we take to be Sonderholm's master debunking argument, along with his proposed Boydian explanation of the semantic intuitions he seeks to debunk. Then in section 3, we mount our defence of the semantic intuitions under scrutiny, arguing on abductive grounds that, contrary to Sonderholm, the semantic intuitions generated by reflection on MTE scenarios are to be trusted in evaluating the plausibility of Boydian moral semantics. Section 4 is our summary and conclusion. (shrink)

Terence Horgan and Mark Timmons's ' moral twin earth argument' raises doubts about the naturalistic realist's ability to make sense of genuine disagreement. I offer three arguments the realist's behalf. First, I argue that the example at the heart of their argument is underdescribed; when fully developed, it loses its intuitive force. Second, I suggest that taking the stipulations of the Horgan-Timmons example seriously gives us reason to revise our initial judgments. Third, I propose combining naturalistic realism about (...) class='Hi'>moral judgments with expressivism about the last ought before action in order to preserve the conflict between moralists and twin -moralists. (shrink)

In "Milk, Honey, and the Good Life on Moral Twin Earth", David Copp explores some ways in which a defender of synthetic moral naturalism might attempt to get around our Moral Twin Earth argument. Copp nicely brings out the force of our argument, not only through his exposition of it, but through his attempt to defeat it, since his efforts, we think, only help to make manifest the deep difficulties the Moral Twin Earth argument poses for (...) the synthetic moral naturalist. (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)

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)

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)

Richard Boyd and Robert Adams have both developed semantic accounts of moral terms based on Hilary Putnam's causal regulation theory for natural kind terms, according to which the terms in question refer to the properties which predominantly causally regulated the terms. However, Terence Horgan and Mark Timmons have mounted an objection to Boyd's semantics—their Moral Twin Earth argument. If this argument is successful against Boyd then it might be thought that it should also be successful against Adams, given (...) the similarity between their semantic accounts. I will argue in this essay that Adams's semantics is sufficiently different from Boyd's to enable him to survive Moral Twin Earth, but that he is vulnerable to a modified version of Moral Twin Earth that I describe. (shrink)

Terry Horgan and Mark Timmons’s “Moral Twin Earth” thought experiment allegedly undercuts virtually any form of naturalist moral realism. I argue that a neo-Aristotelian conception of moral properties defeats Moral Twin Earth. Developing themes in the work of Peter Geach, Philippa Foot, and Rosalind Hursthouse, I sketch an Aristotelian moral semantics that is unique in construing terms like ‘right’ and ‘good’ exclusively as attributive adjectives that denote relational properties. On this view, moral goodness is (...) a relational property predicated of those human beings that satisfy kind-relative criteria of goodness; i.e., morally good human beings are good qua human being. The reference of moral terms is therefore fixed by the natural properties of human beings. This account ensures that moral facts cannot differ across worlds in which the relevant natural facts do not differ and thus defeats 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)

이 논문은 메타윤리학의 대표적인 문제들 가운데 하나인 도덕적 쌍둥이 지구 논증에 대한 응답을 제시한다. 통상적으로 그것은 자연주의적 도덕 실재론의 의미론적 측면인 인과적 지시 이론에 대해 제기된 것으로, 도덕적 용어가 과연 자연종 용어와 같이 취급될 수 있는지를 묻는 것으로 알려져 있다. 이곳에서 나는 그 논증이 가정하는 직관적 자명성을 의문시하는 기존의 몇몇 답변들이 그럴듯하지만, 그 문제를 제기함으로써 드러나는, 배후에 있는 보다 근본적인 문제에 대해서는 별로 알려주는 바가 없다는 점을 지적할 것이다. 그 문제는 자연주의적 입장을 취한다고 할 때, 자연 과학 이론에 비견될 수 (...) 있는 도덕 이론은 무엇인가라는 문제이다. 내가 보기에, 이는 관련 논의 당사자들이 명시적 혹은 암묵적으로 가정하듯, 우리가 흔히 떠올릴 수 있는 규범 윤리학 이론들 가운데 하나가 아니며, 그런 가정이 오히려 도덕적 쌍둥이 지구 논증의 진짜 문제를 발생시키는 원천이 된다. 나는 경험적 인간학의 일종으로 볼 수 있는, “덕 이론”이 자연주의적 도덕 실재론에 부합하는 도덕 이론에 가까울 것이라는 견해를 제안할 것이다. (shrink)

The Moral Twin Earth challenge to ethical naturalism threatens to undermine an otherwise promising metaethical view by showing that typical, naturalist-friendly theories of reference determination predict diverging reference in Twin Earth scenarios, making it difficult to account for substantive moral disagreement. Several theorists have recently invoked David Lewis’s doctrine of reference magnetism as a solution, claiming that a highly elite moral property—a moral “joint in nature”—could secure shared reference between ourselves and our twins on Twin Earth, (...) despite our diverging usages of moral terms. This paper argues that this move has significant methodological implications: namely, it entails that a certain sort of simplicity is truth-conducive. Consequently, when applied to moral theories, this gives certain views, specifically monist ones like utilitarianism and contractualism, an advantage over their more complicated rivals, forms of pluralism and particularism. Thus, ethical naturalists cannot invoke reference magnetism without a substantial impact on first-order theorizing. (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)

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)

Nearly 30 years ago, Terry Horgan and Mark Timmons published a now- popular article that combines Hilary Putnam’s Twin Earth scenario with G.E. Moore’s open question argument in an effort to show that moral naturalism – the view that moral facts are at bottom ordinary, natural facts of some sort – is probably false. Responses to Horgan and Timmons’s “revised open question argument” have been legion, but surprisingly, no one has attempted to test the core assumption upon which (...) the argument is based; namely, that competent language users univocally treat natural kind-terms as rigid designators. Here, I present evidence that the intuitions of competent English speakers are not as univocal as Horgan and Timmons need them to be to ground their argument against moral naturalism. I also briefly sketch a way that the moral naturalist can respond even if competent language speakers do treat natural-kind terms in the way that Horgan and Timmons suggest. (shrink)

Nearly 30 years ago, Terry Horgan and Mark Timmons published a now- popular article that combines Hilary Putnam’s Twin Earth scenario with G.E. Moore’s open question argument in an effort to show that moral naturalism – the view that moral facts are at bottom ordinary, natural facts of some sort – is probably false. Responses to Horgan and Timmons’s “revised open question argument” have been legion, but surprisingly, no one has attempted to test the core assumption upon which (...) the argument is based; namely, that competent language users univocally treat natural kind-terms as rigid designators. Here, I present evidence that the intuitions of competent English speakers are not as univocal as Horgan and Timmons need them to be to ground their argument against moral naturalism. I also briefly sketch a way that the moral naturalist can respond even if competent language speakers do treat natural-kind terms in the way that Horgan and Timmons suggest. (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)

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)

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 properties. Thus Moore and others concluded that moral properties such as goodness were irreducible sui generis properties, not identical to natural. (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)

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)

A brief account of Putnam's Twin Earth thought experiment and its significance, written for a general audience. Sadly, I can't include Helen De Cruz's drawing of it - check out the beautiful book!

In this dissertation, I attempt to provide some new evidence in favour of the claim that meaning is normative—specifically, for the claim that semantic judgments or ascriptions of meaning are action-guiding. I attempt to achieve this by developing an analogue of the Moral Twin Earth argument advanced by Horgan and Timmons which I call the ‘Meaning Twin Earth’ argument. In the course of the dissertation, I outline Kripke’s 1982 sceptical argument for the thesis that there are no meaning facts (...) in virtue of which ascriptions of meaning are true or false and highlight how the claim that meaning is normative is necessary for that argument to succeed with the kind of generality that Kripke intends. I then explain how one of Kripke’s main arguments against dispositionalist accounts of meaning can be viewed as a kind of open question argument. This argument is ultimately a failure, but nonetheless, I argue that the argument can be revised in a way that does pose a genuine threat to dispositionalist accounts of meaning by using an analogue of Horgan and Timmons’ Moral Twin Earth argument. I claim that a Meaning Twin Earth scenario yields linguistic intuitions that, in my view, are best explained by invoking the claim that meaning is normative. These intuitions constitute evidence against both reductive dispositionalism and anti-normativism about meaning. I forestall several potential objections to the Meaning Twin Earth argument drawn from Plunkett and Sundell, Copp, Merli, and Baker. In closing, I consider two broad options for a normativist account of semantic judgment: an expressivist form and a rationalist form. I argue that, provisionally, McDowell’s rationalist version of factualism about meaning faces a less serious challenge than Gibbard’s expressivist alternative. (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)

According to many philosophers, the notion of belief is constitutively normative ; Shah ; Shah and Velleman (); Gibbard (); Wedgwood ). In a series of widely discussed papers, Terence Horgan and Mark Timmons have developed an ingenious ‘Moral Twin Earth’ argument against ‘Cornell Realist’ metaethical views which hold that moral terms have synthetic natural definitions in the manner of natural kind terms. In this paper we shall suggest that an adaptation of the Moral Twin Earth argument (...) to the doxastic case – Doxastic Twin Earth – provides new evidence for the normativity of belief. (shrink)

This paper proposes that there is a kind of moral luck that hasn’t been recognized in the philosophical literature: luck in the ‘wide’ contents of one’s concepts. We will treat moral luck as occurring when an agent is morally responsible for X—when X is a matter of luck for that agent. If moral luck is possible and content externalism is true, then there is a heretofore unrecognized kind of moral luck. We call it “conceptual moral (...) luck.” This new kind of moral luck poses significant problems for two major theories of morally responsible agency, Agent-Causal Libertarianism and the Real Self View. (shrink)

Twin Earth thought experiments are a standard philosophical tool for those offering, or criticizing, metasemantic theories: theories that attempt explain why referring words have the particular referents they have. The general recipe for Twin Earth thought experiments centrally features the description of a planet and population just like Earth and Earthlings, but with some single crucial differeence. In Hilary Putnam’s original version of the experiment, the difference is that the chemical composition of the stuff that looks and behaves like (our) (...) water is XYZ rather than H2O. Such cases show how variation in the physical environment can induce a corresponding variation in reference. In other versions, variations in the linguistic dispositions of speakers are shown to induce corresponding variations in reference. The extension of the word ‘red’ depends on how the linguistic community is disposed to apply that word, as against ‘purple’ or ‘orange’. Perhaps most interestingly, basic normative terms like ‘ought’ or ‘immoral’ seem to vary in neither of these ways. Even if Earthlings and Normative Twin Earthlings consistently made moral judgments in line with two quite distinct moral theories, they might still be talking about the very same property: moral wrongness. The present paper describes and applies a general metasemantic view that yields plausible claims about all three sorts of cases. The view I will defend—neopragmatism—is a fully generalized version of the sort of local expressivism defended in the past by people like Simon Blackburn and Allan Gibbard. Throughout the paper, a contrast is made with a rival approach to the same phenomena: an appeal to reference magnetism. (shrink)

Are moral terms semantically plastic—that is, would very slight changes in our patterns of use have shifted their meanings? This is a delicate question for moral realists. A 'yes' answer seems to conflict with the sorts of intuitions that support realism; but a 'no' answer seems to require a semantics that involves hefty metaphysical commitments. This tension can be illustrated by thinking about how standard accounts of vagueness can be applied to the case of moral terms, and (...) also by considering how realists should respond to the Moral Twin Earth problem. After presenting the puzzle, I will argue that moral realists can accept the semantic plasticity of moral expressions while accounting for contrary intuitions in a way that is nearly cost-free. (shrink)

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 significant challenges remain. (shrink)

The central philosophical challenge of metaethics is to account for the normativity of moral judgment without abandoning or seriously compromising moral realism. In Morality in a Natural World, David Copp defends a version of naturalistic moral realism that can accommodate the normativity of morality. Moral naturalism is often thought to face special metaphysical, epistemological, and semantic problems as well as the difficulty in accounting for normativity. In the ten essays included in this volume, Copp defends solutions (...) to these problems. Three of the essays are new, while seven have previously been published. All of them are concerned with the viability of naturalistic and realistic accounts of the nature of morality, or, more generally, with the viability of naturalistic accounts of reasons. (shrink)

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)