A criticism of Dorothy Edgington's attempt to make Gibbard's problem for indicative conditionals apply to counterfactuals.

Allan Gibbard () argues that the term ‘meaning’ expresses a normative concept, primarily on the basis of arguments that parallel Moore's famous Open Question Argument. In this paper I argue that Gibbard's evidence for normativity rests on idiosyncrasies of the Open Question Argument, and that when we use related thought experiments designed to bring out unusual semantic intuitions associated with normative terms we fail to find such evidence. These thought experiments, moreover, strongly suggest there are basic requirements (...) for a theory of meaning incompatible with Gibbard's ultimate goal of providing an expressivist account of meaning-related concepts. I conclude by considering a possible way in which meaning could be normative, consistent with the intuitions about disagreement; but this form of normativism about meaning appears incompatible with Gibbard's expressivism. (shrink)

This paper aims to investigate Allan Gibbard’s norm-expressivist account of normativity. In particular, the aim is to see whether Gibbard’s theory is able to account for the normativity of reason-claims. For this purpose, I first describe how I come to targeting Gibbard’s theory by setting out the main tenets of quasi-realism cum expressivism. After this, I provide a detailed interpretation of the relevant parts of Gibbard’s theory. I argue that the best reading of his account (...) is the one that takes normativity to be carried by a controlled, coherent, comprehensive set of norms. Finally, I present a potential obstacle to Gibbard’s approach: the regress problem. The idea is to examine the structure of the non-cognitive state expressed and find it inadequate due to the possibility of an infinite regress in the justification of the norms whose acceptance it contains. I then end the paper with some concluding remarks. (shrink)

I tried to tease out what Gilbert means by "normative". It isn't obvious. I conclude that assumptions about ideal agents – not just ideal in the sense of error-free but also ideal in the sense of unlimited – and assumptions about ideal placement of oneself in another person's situation, are essential to what he means. I conclude that what he says is very plausible given these assumptions, though they themselves are very problematic. Especially problematic is the idea of an unlimited (...) simulation of a limited agent's perspective. (shrink)

In this paper I develop an objection to the version of expressivism found in Allan Gibbard’s book Thinking How to Live, and I suggest that the difficulty faced by Gibbard’s analysis is symptomatic of a problem for expressivism more generally. The central claim is that Gibbard’s expressivism is unable to account for certain normative judgments that arise in the process of evaluating cases of innocent mistakes. I begin by considering a type of innocent mistake that (...) class='Hi'>Gibbard’s view is able to capture, one that can occur in situations in which our judgments of what it makes sense to do come apart from our judgments of what it makes sense to plan to do. Whether or not such mistakes are possible is a normative question, and I argue against Gibbard that we should adopt a normative stance that rules out such mistakes. This leads me to consider a second type of innocent mistake, one that can arise when an agent is constituted in such a way as to be incapable of recognizing the appropriate course of action. I argue here that our full normative assessment of the situation incorporates judgments that cannot be captured by Gibbard’s expressivism. I conclude by suggesting that any form of expressivism that shares Gibbard’s commitment to account for an intimate tie between normative judgments and action will face a similar problem. (shrink)

I resolve the major challenge to an Expressivist theory of the meaning of normative discourse: the Frege–Geach Problem. Drawing on considerations from the semantics of directive language (e.g., imperatives), I argue that, although certain forms of Expressivism (like Gibbard’s) do run into at least one version of the Problem, it is reasonably clear that there is a version of Expressivism that does not.

The existence of evil, pain and suffering is considered by many philosophers to be the most vexed question concerning the existence of an omnipotent, omniscient and morally perfect deity. Why would a loving God permit wanton acts of cruelty and misery on the scale witnessed throughout human history? In this essay, Leslie Allan evaluates four common theistic responses to this problem, highlighting the benefits and challenges faced by each approach. He concludes with a critical examination of a theistic defence (...) designed to show that the problem of evil is not a problem at all. (shrink)

The soul-making theodicy seeks to explain how belief in the existence of God is compatible with the evil, pain and suffering we experience in our world. It purports to meet the problem of evil posed by non-theists by articulating a divine plan in which the occurrence of evil is necessary for enabling the greater good of character building of free moral agents. Many philosophers of religion have levelled strong objections against this theodicy. In this essay, Leslie Allan considers the (...) effectiveness of the counterarguments advanced by theist philosopher, Clement Dore, to two key objections to the soul-making theodicy. (shrink)

Absolutist systems of ethics have come in for harsh criticism on a number of fronts. The Principle of Double Effect was formulated by Catholic ethicists to overcome such objections. In this essay, Leslie Allan addresses four of the most prominent problems faced by an absolutist ethic and evaluates the extent to which the Principle of Double Effect is successful in avoiding or mitigating these criticisms.

Enlightenment philosopher, René Descartes, set out to establish what could be known with certainty, untainted by a deceiving demon. With his method of doubt, he rejected all previous beliefs, allowing only those that survived rigorous scrutiny. In this essay, Leslie Allan examines whether Descartes's program of skeptical enquiry was successful in laying a firm foundation for our manifold beliefs. He subjects Descartes's conclusions to Descartes's own uncompromising methodology to determine whether Descartes escaped from a self-imposed radical skepticism.

Meta-ethics is the area of philosophy in which thinkers explore the language and nature of moral discourse and its relations to other non-moral areas of life. In this introduction to the discipline written explicitly for novices, Leslie Allan outlines the key questions and areas of analysis in contemporary meta-ethics. In clear, tabular format, he summarizes the core concepts integral to each of the major meta-ethical positions and the strengths of each view. To prompt further thinking and reading, Allan (...) explains briefly the major objections to each theory and lists each view's best known advocates. (shrink)

As a non-cognitivist analysis of moral language, Charles Stevenson's sophisticated emotivism is widely regarded by moral philosophers as a substantial improvement over its historical antecedent, radical emotivism. None the less, it has come in for its share of criticism. In this essay, Leslie Allan responds to the key philosophical objections to Stevenson's thesis, arguing that the criticisms levelled against his meta-ethical theory rest largely on a too hasty reading of his works.

In his seminal essay, Harry Frankfurt argued that our exercise of free will and allocation of moral responsibility do not depend on us being able to do other than we did. Leslie Allan defends this moral maxim from Frankfurt's attack. Applying his character-based counterfactual conditional analysis of free acts to Frankfurt's counterexamples, Allan unpacks the confusions that lie at the heart of Frankfurt's argument. The author also explores how his 4C compatibilist theory measures up against Frankfurt’s conclusions.

Leslie Allan defends his thesis that ethics is objective in the sense of requiring moral agents to offer impartial reasons for acting. Radical subjectivists have attacked this requirement for impartiality on a number of grounds. Some critics make the charge that Allan's thesis is simply a version of subjectivism in disguise. He responds by showing how a broadly naturalist view of ethics accommodates objective moral constraints. Allan also counters cases in which impartiality is purportedly not morally required (...) and considers the subjectivists' response to the problem of demarcating moral from non-moral judgements. (shrink)

Imre Lakatos holds a well-deserved primary place in current philosophy of science. In this essay, Leslie Allan critically examines Lakatos' theory of knowledge in two key areas. The first area of consideration is Lakatos' notion that knowledge is gained through a process of competition between rival scientific research programmes. Allan identifies and discusses four problems with Lakatos' characterization of a research programme. Next, Allan considers Lakatos' proposed test of adequacy for theories of rationality using his methodology of (...) historiographical research programmes. Allan discovers tensions within Lakatos' criteria and suggests ways of strengthening his test. (shrink)

In this comprehensive work on theories of rationality, Leslie Allan builds on the seminal insights of Imre Lakatos. Allan begins by critically reviewing Lakatos' theory of rationality (MSRP) and his meta-theory of rationality (MHRP) and suggesting improvements to his scheme. Allan's main task is developing a theory of rationality that avoids Lakatos' Achilles' heel; the presupposition that science is a rational enterprise. To achieve this, he attempts to draw out from the general demands of an objectivist epistemology (...) the various criteria of dependence and independence applying to evidence-statements. He concludes by considering two serious objections to his framework. (shrink)

Some atheistic philosophers have argued that God could have created a world with free moral agents and yet absent of moral evil. Using possible world semantics, Alvin Plantinga sought to defuse this logical form of the problem of evil. In this critical note, Leslie Allan examines the adequacy of Plantinga's argument that the existence of God is logically compatible with the existence of moral evil. The veracity of Plantinga's argument turns on whether his essential use of counterfactual conditionals preserves (...) the logic of this type of conditional. (shrink)

Drawing on insights from Imre Lakatos' seminal work on theories of rationality, Leslie Allan develops seven criteria for rational theory choice that avoid presuming the rationality of the scientific enterprise. He shows how his axioms of rationality follow from the general demands of an objectivist epistemology. Allan concludes by considering two weighty objections to his framework.

The standard view says that epistemic normativity is normativity of belief. If you’re an evidentialist, for example, you’ll think that all epistemic reasons are reasons to believe what your evidence supports. Here we present a line of argument that pushes back against this standard view. If the argument is right, there are epistemic reasons for things other than belief. The argument starts with evidentialist commitments and proceeds by a series of cases, each containing a reason. As the cases progress, the (...) reasons change from counting in favor of things like having a belief to things like performing ordinary actions. We argue that each of those reasons is epistemic. If the argument succeeds, we should think there are epistemic reasons to consider hypotheses, conduct thought and physical experiments, extend one’s evidence, and perform mundane tasks like eating a sandwich, just as there are epistemic reasons to believe what one’s evidence supports. (shrink)

Analyses of moral value judgements must meet a practicality requirement: moral speech acts characteristically express pro- or con-attitudes, indicate that speakers are motivated in certain ways, and exert influence on others' motivations. Nondescriptivists including Simon Blackburn and Allan Gibbard claim that no descriptivist analysis can satisfy this requirement. I argue first that while the practicality requirement is defeasible, it indeed demands a connection between value judgement and motivation that resembles a semantic or conceptual rather than merely contingent psychological (...) link. I then show how a form of descriptivism, the interest-relational theory, satisfies the requirement as a pragmatic and conversational feature of value judgement – thereby also accommodating its defeasibility. The word ``good'' is always indexed to some set of motivations: when this index is unarticulated in many contexts the speaker conversationally implicates possession of those motivations. (shrink)

The paper explores the much-neglected but crucial topic of the capacity of art to transcend time.

This paper develops an account of the meaning of `ought', and the distinction between weak necessity modals (`ought', `should') and strong necessity modals (`must', `have to'). I argue that there is nothing specially ``strong'' about strong necessity modals per se: uses of `Must p' predicate the (deontic/epistemic/etc.) necessity of the prejacent p of the actual world (evaluation world). The apparent ``weakness'' of weak necessity modals derives from their bracketing whether the necessity of the prejacent is verified in the actual world. (...) `Ought p' can be accepted without needing to settle that the relevant considerations (norms, expectations, etc.) that actually apply verify the necessity of p. I call the basic account a modal-past approach to the weak/strong necessity modal distinction (for reasons that become evident). Several ways of implementing the approach in the formal semantics/pragmatics are critically examined. The account systematizes a wide range of linguistic phenomena: it generalizes across flavors of modality; it elucidates a special role that weak necessity modals play in discourse and planning; it captures contrasting logical, expressive, and illocutionary properties of weak and strong necessity modals; and it sheds light on how a notion of `ought' is often expressed in other languages. These phenomena have resisted systematic explanation. In closing I briefly consider how linguistic inquiry into differences among necessity modals may improve theorizing on broader philosophical issues. (shrink)

The conventional view that all Enlightenment thinkers believed that the fruits of Reason could only be beneficial is not necessarily accurate. Laclos, whose celebrated novel "Les Liaisons dangereueses" was published in 1782, provides a perspective on the world of Reason that does not square with that view. Working at the level of individual psychology, Reason in Laclos's novel divides the world into the strong and the weak – more specifically, the astute and the naive. It defines human worth in terms (...) of a capacity to outwit and control others, a capacity that can only be fully expressed by the complete defeat and humiliation of one’s adversary. (shrink)

This paper is a concise survey of recent expressivist theories of discourse, focusing on the ethical case. For each topic discussed recent trends are summarised and suggestions for further reading provided. Issues covered include: the nature of the moral attitude; ‘hybrid’ views according to which moral judgements express both beliefs and attitudes; the quasi-realist programmes of Simon Blackburn and Allan Gibbard; the problem of creeping minimalism; the nature of the ‘expression’ relation; the Frege-Geach problem; the problem of wishful (...) thinking; the role of moral intuitions; expressivism in aesthetics. (shrink)

Examines (1) the birth of art-as-beauty in Western art and the concomitant birth of the idea of art itself; (2) the death of art-of-beauty from Manet onwards. Also looks briefly at some major implications for aesthetics (the philosophy of art). Paper includes some relevant reproductions.

Can novels, plays and poetry tell us something important and true about who we are, about others, and about life generally? The question seems to be of interest not only to writers on literary theory and aesthetics, but to people generally. This paper considers the issues involved.

Allan Gibbard maintains that his plan-based expressivism allows for a particular type of innocent mistake: I can agree that your plan to X makes sense (say, because it was based on advice from someone you trust), while nonetheless insisting that it is incorrect (e.g., because you chose a bad advisor). However, Steve Daskal has recently argued that there are significant limitations in Gibbard’s account of how we can be mistaken about the normative judgments we make. This essay (...) refines Gibbard’s account in order to show--contra Daskal--that expressivists can deliver a surprisingly robust form of normative objectivity. (shrink)

I discuss a strategy for grounding ethical naturalism propounded by Frank Jackson and more recently by Allan Gibbard: that the undisputed supervenience of the moral upon the natural (or descriptive) entails that moral properties are natural (or descriptive) properties. I show that this strategy falls foul of certain indubitable constraints governing natural kinds; and I then rebut some objections. The upshot is that no viable strategy for supporting ethical naturalism is to be found along these lines. This result (...) has additional consequences, both for Jackson's attempt to accommodate ethical discourse into the natural world, and for Gibbard's purported 'meta-ethical synthesis'. (shrink)

The question of whether or not art is essentially a representation of reality has long been a bone of contention among philosophers of art – especially in the major branch of that discipline called the analytic philosophy of art, or analytic aesthetics. This paper argues that art - visual art, literature or music - is never essentially representation. The argument is based on the thinking of André Malraux in "The Voices of Silence".

The author mounts a case against the libertarian and hard determinist's thesis that free will is impossible in a deterministic world. He charges incompatibilists with misconstruing ordinary 'free will' talk by overlaying common language with their own metaphysical presuppositions. Through a review of ordinary discourse and recent developments in jurisprudence and the sciences, he draws together the four key factors required for an act to be free. He then puts his 4C theory to work in giving a credible account of (...) how caused human agents 'could have done otherwise'. (shrink)

One might naturally suppose that philosophers of art would take a strong interest in the idea of creation in the context of art. In fact, this has often not been the case. In analytic aesthetics, the issue tends to dwell on the sidelines and in continental aesthetics a shadow has sometimes been cast over the topic by the notion of the “death of the author” and by the claim, as Roland Barthes put it, that the author is only ever able (...) to “imitate a gesture that is always anterior, never original”. This paper explains the understanding of artistic creation developed by the French art theorist André Malraux in his well-known book The Voices of Silence. Malraux argues that the true artist is involved in a creative act in the full sense of the term – creation ex nihilo – despite the debt he or she often owes to other artists. The paper also comments briefly on possible reasons why traditional post-Enlightenment aesthetics has said so little about the topic in question. (shrink)

It’s common knowledge that those objects we regard as great works of art have a capacity to survive across time. But that observation is only a half-truth: it tells us nothing about the nature of this power of survival – about how art endures. -/- This question was once at the heart of Western thinking about art. The Renaissance solved it by claiming that great art is “timeless”, “eternal” – impervious to time, a belief that exerted a powerful influence on (...) Enlightenment philosophers and, later, on modern aesthetics. -/- The notion that art is timeless was contradicted by nineteenth century thinkers such as Hegel, Marx, and Taine who stressed the historical embeddedness of art. The conflict of these two ideas, together with other major factors discussed in this paper, has left us today without a viable account of the nature of art’s capacity to transcend time. -/- This paper proposes an alternative solution: the proposition that art survives by a process of metamorphosis. But the principal emphasis of the paper is on the question itself: how does art transcend time? (a question that has nothing to do with the so-called “test of time”). If modern aesthetics is to remain relevant to our modern world of art, in which the art of the past – stretching back to Lascaux and beyond – is as important as Picasso and contemporary art, it urgently needs to address this neglected question. (shrink)

From the Renaissance onwards, the Western tradition singled out the term beauty for a unique and highly prestigious role. As Christian belief began its gradual decline, Renaissance art invented a rival transcendence in the form of an exalted world of nobility, harmony and beauty – the world exemplified by the works of painters such as Raphael, Titian and Poussin. Beauty in this sense quickly became the ruling ideal of Western art, subsequently underpinning the explanations of the nature and function of (...) art (the aesthetics) developed by Enlightenment thinkers such as Hume and Kant – explanations that continue to be influential among contemporary philosophers of art. Today, however, there are fundamental questions to be asked: Is beauty still the ruling ideal of art? If not, what becomes of traditional, post-Enlightenment aesthetics which continues to shape much modern thinking about art? (shrink)

One important but infrequently discussed difficulty with expressivism is the attitude type individuation problem.1 Expressivist theories purport to provide a unified account of normative states. Judgments of moral goodness, beauty, humor, prudence, and the like, are all explicated in the same way: as expressions of attitudes, what Allan Gibbard calls “states of norm-acceptance”. However, expressivism also needs to explain the difference between these different sorts of attitude. It is possible to judge that a thing is both aesthetically good (...) and morally bad. While the realist can explain the difference by suggesting that each judgment makes reference to a different property (or set of properties), the expressivist cannot. She must show that what is expressed by the speaker is different in each case. This has proven to be difficult to do. (shrink)

A conference paper examining the relationship between art and what is loosely termed the “real world”.

The paper highlights analytic aesthetics’ unacknowledged assumption that art is timeless, a view it inherited from Enlightenment thinkers such as Hume and Kant, who in turn inherited it from the Renaissance. This view, I contend, is no longer tenable because it is at odds with our experience of the art of the past. Analytic aesthetics avoids this key problem because it confines its attention to issues such as the nature of aesthetic pleasure, whether the appreciation of art should be disinterested (...) and so on, which can be partitioned off from historical change and encased in a world where time stands still and where, by consequence, the temporal nature of art, including art’s capacity to transcend time, is ignored. (shrink)

Os tópicos e problemas filosóficos discutidos no volume são de natureza bastante variada: a natureza da complexidade computacional no processamento de uma língua natural; a relação entre o significado linguístico e o sentido Fregeano; as conexões entre a a agência e o poder; o conteúdo semântico da ficção; a explicação dos impasses éticos; a natureza dos argumentos cépticos; as conexões entre as dissociações cognitivas e o carácter modular da mente; a relação entre a referência e o significado. Estes tópicos deixam-se (...) subsumir num tema mais geral, o tema das ligações múltiplas entre a cognição e o conteúdo, mental ou linguístico. O tópico do conteúdo, a questão de determinar como é que muitas das nossas elocuções e muitos dos nossos estados mentais são dotados de conteúdo, representam algo (correcta ou incorrectamente), e o tópico da cognição, a investigação da natureza e dos mecanismos envolvidos na cognição humana, no processamento de informação tipicamente proveniente do exterior, são inegavelmente tópicos centrais da investigação filosófica, presente ou passada.Dado o carácter inclusivo e pluridisciplinar dos tópicos cobertos, não é surpreendente que os ramos da Filosofia representados no presente volume sejam igualmente diversificados: a Filosofia Moral, a Filosofia da Linguagem, a Teoria do Conhecimento, a Filosofia da Mente, os Fundamentos da Ciência Cognitiva. E também não é surpreendente que nele também estejam representados outros ramos do conhecimento cuja relevância para o estudo do conteúdo e da cognição é conspícua: a Psicologia Cognitiva; a Linguística Computacional e a Inteligência Artificial. Os autores dos ensaios são de proveniências diversas. De um lado, há um conjunto de especialistas nacionais a trabalhar na tradição analítica em Filosofia, como João Branquinho, ou a trabalhar em algumas áreas filosoficamente importantes da Ciência Cognitiva, como António Branco (Processamento da Língua Natural), José Frederico Marques (Psicologia Cognitiva) e Helder Coelho (Inteligência Artificial). Do outro lado, há um conjunto de especialistas estrangeiros de elevada reputação internacional: Allan Gibbard, da Universidade de Michigan, autor de livros influentes na área da Ética e Filosofia Moral; Stephen Schiffer, da New York University, uma das principais figuras actuais da Filosofia da Linguagem e da Semântica Geral; Paolo Leonardi, da Universidade de Bolonha, um especialista nas áreas da Filosofia da Linguagem e Filosofia da Comunicação; e Manuel García-Carpintero, da Universidade de Barcelona, um dos grandes vultos da Filosofia Analítica praticada em Espanha e na Europa Continental. (shrink)

The ontological argument for the existence of God has enjoyed a recent renaissance among philosophers of religion. Alvin Plantinga's modal version is perhaps the most notable example. This essay critically examines Plantinga's rendition, uncovering both its strengths and weaknesses. The author concludes that while the argument is probably formally valid, it is ultimately unsound. Nonetheless, Plantinga's version has generated much interest and discussion. The author spends some time uncovering the reasons for the argument's powerful intuitive appeal. He concludes his essay (...) by appraising Pruss's recent defence of Plantinga's argument. (shrink)

Conservative and liberal approaches to the problem of abortion are oversimplified and deeply flawed. Accepting that the moral status of the conceptus changes during gestation, the author advances a more nuanced perspective. Through applying a form of rules in practice utilitarianism within the context of overall population policy, he provides a compelling ethical and legal framework for regulating contraception and abortion practices.

The author contends that classifying theories in the field of meta-ethics along a single dimension misses important nuances in each theory. With the increased sophistication and complexity of meta-ethical analyses in the modern era, the traditional cognitivist–non-cognitivist and realist–anti-realist categories no longer function adequately. The author categorizes the various meta-ethical theories along three dimensions. These dimensions focus on the linguistic analysis offered by each theory, its metaphysical commitments and its degree of normative tolerance.

The materialist version of the mind/brain identity theory has met with considerable challenges from philosophers of mind. The author first dispenses with a popular objection to the theory based on the law of indiscernibility of identicals. By means of discussing the vexatious problem of phenomenal qualities, he explores how the debate may be advanced by seeing each dualist and monist ontology through the lens of an evolutionary epistemology. The author suggests that by regarding each ontology as the core of a (...) scientific research programme, each of these logically irrefutable hypotheses can be tested rationally. (shrink)

The author challenges both the eliminative idealist's contention that physical objects do not exist and the phenomenalist idealist's view that statements about physical objects are translatable into statements about private mental experiences. Firstly, he details how phenomenalist translations are parasitic on the realist assumption that physical objects exist independently of experience. Secondly, the author confronts eliminative idealism head on by exposing its heuristic sterility in contrast with realism's predictive success.

This essay explores the moral reasoning underpinning the common view that it is worse to kill a human compared with killing an animal. After examining the serious deficiencies of traditional approaches, the author develops an alternative utilitarian-based framework that proportions the seriousness of killing to levels of sentience. He demonstrates how this new approach avoids the problems faced by the application of standard utilitarian formulae in weighing the seriousness of killing many low-sentience animals vis-á-vis killing a single human. The author (...) concludes with a discussion of how this new approach overcomes the difficulties faced by Peter Singer’s dualist form of utilitarianism. (shrink)

Explores the failure of analytic aesthetics to examine the question of the capacity of art to transcend time, and its own commitment – seldom explicitly acknowledged – to the assumption that this capacity functions through the traditional, but no longer viable, notion of timelessness inherited from Enlightenment aesthetics.

This is a very useful sourcebook of classic experiments, giving enough detail to show what is going on in each of them but discussing enough separate experiments that one can see a variety of experimental virtues. Franklin's attention to detail and his epistemological caution inhibit him from tackling some more adventurous questions. On what range of topics can we hope for evidence that is as convincing as this? Do essential aspects of experiment vary from one discipline to another?

I Racconti di Edgar Allan Poe, tra orrore e ricerca della luce.

In a first investigation, a Lacan-motivated template of the Poe story is fitted to the data. A segmentation of the storyline is used in order to map out the diachrony. Based on this, it will be shown how synchronous aspects, potentially related to Lacanian registers, can be sought. This demonstrates the effectiveness of an approach based on a model template of the storyline narrative. In a second and more Comprehensive investigation, we develop an approach for revealing, that is, uncovering, Lacanian (...) register relationships. Objectives of this work include the wide and general application of our methodology. This methodology is strongly based on the “letting the data speak” Correspondence Analysis analytics Platform of Jean-Paul Benzécri, that is also the geometric data analysis, both qualitative and quantitative analytics, developed by Pierre Bourdieu. (shrink)

Which rules for aggregating judgments on logically connected propositions are manipulable and which not? In this paper, we introduce a preference-free concept of non-manipulability and contrast it with a preference-theoretic concept of strategy-proofness. We characterize all non-manipulable and all strategy-proof judgment aggregation rules and prove an impossibility theorem similar to the Gibbard--Satterthwaite theorem. We also discuss weaker forms of non-manipulability and strategy-proofness. Comparing two frequently discussed aggregation rules, we show that “conclusion-based voting” is less vulnerable to manipulation than “premise-based (...) voting”, which is strategy-proof only for “reason-oriented” individuals. Surprisingly, for “outcome-oriented” individuals, the two rules are strategically equivalent, generating identical judgments in equilibrium. Our results introduce game-theoretic considerations into judgment aggregation and have implications for debates on deliberative democracy. (shrink)