Responding to recent concerns about the reliability of the published literature in psychology and other disciplines, we formed the X-Phi Replicability Project to estimate the reproducibility of experimental philosophy. Drawing on a representative sample of 40 x-phi studies published between 2003 and 2015, we enlisted 20 research teams across 8 countries to conduct a high-quality replication of each study in order to compare the results to the original published findings. We found that x-phi studies – as represented in our sample (...) – successfully replicated about 70% of the time. We discuss possible reasons for this relatively high replication rate in the field of experimental philosophy and offer suggestions for best research practices going forward. (shrink)

Over the past two decades, the study of moral reasoning has been heavily influenced by Joshua Greene’s dual-process model of moral judgment, according to which deontological judgments are typically supported by intuitive, automatic processes while utilitarian judgments are typically supported by reflective, conscious processes. However, most of the evidence gathered in support of this model comes from the study of people’s judgments about sacrificial dilemmas, such as Trolley Problems. To which extent does this model generalize to other debates in which (...) deontological and utilitarian judgments conflict, such as the existence of harmless moral violations, the difference between actions and omissions, the extent of our duties of assistance, and the appropriate justification for punishment? To find out, we conducted a series of five studies on the role of reflection in these kinds of moral conundrums. In Study 1, participants were asked to answer under cognitive load. In Study 2, participants had to answer under a strict time constraint. In Studies 3 to 5, we sought to promote reflection through exposure to counter-intuitive reasoning problems or direct instruction. Overall, our results offer strong support to the extension of Greene’s dual-process model to moral debates on the existence of harmless violations and partial support to its extension to moral debates on the extent of our duties of assistance. (shrink)

Many people believe that human interests matter much more than the like interests of non-human animals, and this “speciesist belief” plays a crucial role in the philosophical debate over the moral status of animals. In this paper, I develop a debunking argument against it. My contention is that this belief is unjustified because it is largely due to an off-track process: our attempt to reduce the cognitive dissonance generated by the “meat paradox”. Most meat-eaters believe that it is wrong to (...) harm animals unnecessarily, yet they routinely and deliberately behave in ways that cause great unnecessary suffering to animals. As recent research suggests, this practical inconsistency puts them in an unpleasant state of dissonance, which they try to escape by resolving the paradox. And they do so in part by adopting the speciesist belief—if animal suffering matters much less than human suffering, then harming animals cannot be so wrong after all. Since this belief-forming process does not track moral truth, I conclude that we are not justified in believing that human interests matter more than the similar interests of non-humans. (shrink)

Oscar Horta has argued that speciesism is wrong by definition. In his view, there can be no more substantive debate about the justification of speciesism than there can be about the legality of murder, for it stems from the definition of “speciesism” that speciesism is unjustified just as it stems from the definition of “murder” that murder is illegal. The present paper is a case against this conception. I distinguish two issues: one is descriptive and the other normative. Relying on (...) philosophers’ use of the term, I first answer the descriptive question negatively: speciesism is a purely descriptive concept. Then, based on both its main functions in the philosophical and public debates and an analogy with racism, I answer the normative question negatively: speciesism should remain a purely descriptive concept. If I am correct, then speciesism neither is nor should be wrong by definition. (shrink)

Appendix 1 was incomplete in the initial online publication. The original article has been corrected.

Moral error theorists face the so-called “now-what problem”: what should we do with our moral judgments from a prudential point of view if these judgments are uniformly false? On top of abolitionism and conservationism, which respectively advise us to get rid of our moral judgments and to keep them, three revisionary solutions have been proposed in the literature: expressivism, naturalism, and fictionalism. In this paper, I argue that expressivism and naturalism do not constitute genuine alternatives to abolitionism, of which they (...) are in the end mere variants—and, even less conveniently, variants that are conform to the very spirit of abolitionism as formulated by its proponents. The main version of fictionalism, by contrast, provides us with a recommendation to which abolitionists cannot consistently subscribe. This leaves us with only one revisionary solution to the now-what problem. (shrink)

Katarzyna de Lazari-Radek and Peter Singer have recently provided an evolutionary argument for utilitarianism. They argue that most of our deontological beliefs were shaped by evolution, from which they conclude that these beliefs are unjustified. By contrast, they maintain that the utilitarian belief that everyone’s well-being matters equally is immune to such debunking arguments because it wasn’t similarly influenced. However, Guy Kahane remarks that this belief lacks substantial content unless it is paired with an account of well-being, and he adds (...) that utilitarian beliefs about wellbeing—e.g. the belief that pleasure is good and pain is bad—were probably shaped by evolution. Logically, de Lazari-Radek and Singer should therefore reject these beliefs along with the deontological beliefs that evolved. The present paper is a defense of their argument. After considering a number of unsuccessful replies to Kahane’s objection, I put forward a more promising solution: de Lazari-Radek and Singer should combine their objectivist view in metaethics with a subjectivist account of well-being, such as the desire theory. Such a hybrid account would tackle Kahane’s challenge because subjective accounts of value are immune from evolutionary debunking arguments. And it would be compatible with utilitarianism, which doesn’t fit very well with metaethical subjectivism. Before concluding, I deal with two concerns that this solution might raise: I argue that the desire theory is actually subjective enough to escape Kahane’s objection, and I deny that retreating to the combination of ethical objectivism and prudential subjectivism is ad hoc. (shrink)

Vous pensez peut-être que la peine de mort est injuste ? Ou que l’avortement est moralement acceptable ? Se pourrait-il alors que vous vous trompiez ? C’est en tout cas l’avis des théoriciens de l’erreur. D’après ces philosophes, tous les jugements moraux sont faux parce qu’ils présupposent à tort l’existence de faits moraux à la fois objectifs et non naturels. Organisé autour de ce défi nihiliste, le présent ouvrage aborde les principales théories métaéthiques comme autant de tentatives, plus ou moins (...) fructueuses, de sauver la morale. Les théories qu’on y rencontre combinent invariablement une thèse psychologique (sur la nature des jugements moraux) et une thèse ontologique (sur l’existence d’une réalité morale conforme auxdits présupposés). Dans le style argumentatif sobre et précis qui caractérise la philosophie analytique, ce manuel de métaéthique – le premier en langue française – entreprend d’évaluer minutieusement un ensemble de théories sur la morale. Bien que destiné en premier lieu aux enseignants de philosophie et à leurs étudiants, il se veut accessible à tous ceux qu’intéresse l’éthique. (shrink)

The moral error theory holds that moral claims and beliefs, because they commit us to the existence of illusory entities, are systematically false or untrue. It is an open question what we should do with moral thought and discourse once we have become convinced by this view. Until recently, this question had received two main answers. The abolitionist proposed that we should get rid of moral thought altogether. The fictionalist, though he agreed we should eliminate moral beliefs, enjoined us to (...) replace them with attitudes that resemble to some extent the attitudes we have towards pieces of fiction. But there is now a third theory on the market: conservationism, the view that we should keep holding moral beliefs, even though we know them to be false. (According to a fourth theory, ‘substitutionism’, we should modify the content of our moral claims in such a way that they become true.) Putting abolitionism (and substitutionism) aside, our aim is to assess the plausibility of conservationism as an alternative to the – relatively dominant – fictionalism that we find in the literature. Given the difficulty of finding a conservationist view that is both (i) plausible and (ii) not merely a terminological variant of fictionalism, we will argue that conservationism fails to constitute a plausible alternative to fictionalism, at least insofar as it purports to be an alternative view as to what we should do with our moral thoughts. (shrink)

La philosophie morale est traditionnellement divisée en trois sous-disciplines : l’éthique appliquée, qui, comme son nom l’indique, s’intéresse aux positions à adopter sur des sujets pratiques ; l’éthique normative, où s’opposent un ensemble de théories sur ce qui devrait être, sur ce qui est bon/mauvais, etc. ; et la méta-éthique, qui étudie des questions non morales, mais relatives à la morale 1 . Cette dernière définition peut paraître floue, mais c’est un flou que rend nécessaire l’hétérogénéité propre à la discipline. (...) En effet, celle-ci est elle-même divisée en plusieurs domaines : l’épistémologie morale, l’ontologie morale, la psychologie morale, la phénoménologie morale et la logique morale (l’analyse des concepts moraux). Il n’est pas impossible de croiser les domaines, à l’instar de David McNaughton qui oppose une théorie ontologique – le réalisme – à une théorie épistémologique – le non-cognitivisme. Le réalisme moral affirme l’existence de propriétés morales non réductibles à des propriétés non morales : un acte est condamnable si et seulement s’il possède, à côté de ses propriétés non morales (il s’agit d’un acte délibéré, prémédité, etc.), la propriété d’être condamnable. Et, quant à lui, le cognitivisme soutient qu’une opinion morale n’est rien de plus qu’un état cognitif, qu’une croyance. Ce que nie le non-cognitivisme. Ainsi, selon McNaughton, le principal argument contre le réalisme moral est non cognitiviste. (shrink)

The moral error theory has become increasingly popular in recent decades. So much so indeed that a new issue emerged, the so-called “now-what problem”: if all our moral beliefs are false, then what should we do with them? So far, philosophers who are interested in this problem have focused their attention on the mode of the attitudes we should have with respect to moral propositions. Some have argued that we should keep holding proper moral beliefs; others that we should replace (...) our moral beliefs with fictional attitudes, beliefs in natural facts, or conative attitudes. But all these philosophers have set aside an important question about the content of these attitudes: which moral propositions, and more generally which moral theory, should we accept? The present paper addresses this neglected issue, arguing that moral error theorists should adopt a utilitarian moral fiction. In other words, they should accept the set of moral principles whose general acceptance would maximize overall well-being. (shrink)

The prevalent view in animal ethics is that speciesism is wrong: we should weigh the interests of humans and non-humans equally. Shelly Kagan has recently questioned this claim, defending speciesism against Peter Singer’s seminal argument based on the principle of equal consideration of interests. This critique is most charitably construed as a dilemma. The principle of equal consideration can be interpreted in either of two ways. While it faces counterexamples on the first reading, it makes Singer’s argument question-begging on the (...) second. In response, Singer has grasped the first horn of this dilemma and tried to accommodate Kagan’s apparent counterexamples. In my opinion, this attempt is unpersuasive: the principle of equal consideration is inconsistent with common-sense intuitions on Kagan’s cases. Worse, Singer’s argument begs the question anyway. It therefore faces two serious objections. This is not to say that there is nothing wrong with speciesism, however. In the second half of the paper, I propose another, better argument against speciesism, which I argue is immune to both objections. According to this other argument, speciesism is wrong because it involves discriminating on the basis of a merely biological property. (shrink)