Previous research using immersive virtual reality (VR) has shown that after a short period of embodiment of White people in a Black virtual body their implicit racial bias against Black people diminishes. Here we tested the effects of some socio-cognitive variables that could contribute to enhancing or reducing the implicit racial bias. The first aim of the study was to assess the beneficial effects of cooperation within a VR scenario, the second aim was to provide preliminary testing of the hypothesis (...) that empathy and political attitudes could contribute to implicit bias about race, while the third aim was to explore the relationship between political attitudes and empathy. We had (Caucasian) participants embodied in a Black virtual body and engaged either in a cooperative (Coop group) or in a non-cooperative (Neutral group) activity with a confederate experimenter embodying another Black avatar. Before and after VR, we measured participants’ implicit racial bias by means of Implicit Association Test (IAT) and their perceived closeness toward the confederate experimenter. Before VR we also assessed participants’ political attitudes and empathy traits. Results revealed that, as compared to the Neutral group, the Coop group showed lower IAT scores after the social interaction. Interestingly, in the Neutral but not the Coop group the perceived closeness toward the confederate experimenter was associated with the initial racial bias: the more the participants reduced their distance, the more they reduced their IAT score. Moreover, reported traits of empathy and political attitudes significantly explained the variance observed in the initial implicit bias, with perspective-taking, empathic concern, and personal distress being significant predictors of the IAT scores. Finally, there was a relationship between political attitudes and empathy: the more participants considered themselves as left-wing voters, the higher their perspective-taking and empathic concern scores. We discuss these findings within the neuroscientific and social cognition field and encourage scholars from different domains to further explore whether and under which conditions a given manipulation for reducing racial bias could be efficiently transposed in VR. (shrink)

Jean-Paul Sartre, in describing the realization of his freedom, was often inclined to say mysterious things like ‘I am what I am not’, ‘I am not what I am’ (‘as I am already what I will be …, I am the self which I will be, in the mode of not being it’, ‘I make myself not to be the past … which I am’.) He was therefore plainly contradicting himself, but was this merely a playful literary figure (paradox), or (...) was he really being incoherent? By the latter judgment I do not mean to reject his statements entirely (like many of his Anglo-Saxon contemporaries); for I believe there is an intimate link between contradiction and freedom, as I shall explain in this paper. But a minor thing we must first have out of the way is the suggestion that Sartre's language was just a rhetorical trope, designed merely to express some banal platitude in a bemusing way: ‘I am not yet what I will be’, ‘I am no longer what I was’ are sane and sensible, for instance, but cannot be the meant content of Sartre's sayings, since, while they would indeed describe the reform of some character, they would be appropriate only before or after some metamorphosis, not, as Sartre clearly intended, in the midst of some process of riddance and conversion, whether radical or otherwise. Yet, in the turmoil of such a change, ‘I am not what I am’ (or the everyday ‘I am not myself’) still, surely, cannot be true, and if that is the case, Sartre must be being inocherent, and therefore, obfuscating and deliberately obscure, and hence, it seems, must properly be rejected by all right and clear thinking men. (shrink)

In this paper, I present the conjunction between a) a new history and philosophy of science, which, under the banner of a renewed historical epistemology, articulate a new relation between conceptual history and situated history; and b) new narratives in the history of philosophy that integrate women philosophers by showing the displacements this causes in terms of corpus, objects of research, and forms of writing. By questioning the philosophical canon, new focal points are brought to light.. Then I briefly present (...) the tools of feminist epistemology as methodological instruments to, in act, proceed to these decenterings. I conclude with two examples from the Modern Age: Margaret Cavendish and Emilie du Châtelet. Until recently, these two women philosophers were mocked and little considered, but today they are part of the canon, have become mainstream in many Anglo-Saxon universities. I show how this shift changes the landscape of history and philosophy of science. (shrink)

Jean-Paul Sartre, in describing the realization of his freedom, was often inclined to say mysterious things like ‘I am what I am not’, ‘I am not what I am’ (‘as I am already what I will be …, I am the self which I will be, in the mode of not being it’, ‘I make myself not to be the past … which I am’.) He was therefore plainly contradicting himself, but was this merely a playful literary figure (paradox), or (...) was he really being incoherent? By the latter judgment I do not mean to reject his statements entirely (like many of his Anglo-Saxon contemporaries); for I believe there is an intimate link between contradiction and freedom, as I shall explain in this paper. But a minor thing we must first have out of the way is the suggestion that Sartre's language was just a rhetorical trope, designed merely to express some banal platitude in a bemusing way: ‘I am not yet what I will be’, ‘I am no longer what I was’ are sane and sensible, for instance, but cannot be the meant content of Sartre's sayings, since, while they would indeed describe the reform of some character, they would be appropriate only before or after some metamorphosis, not, as Sartre clearly intended, in the midst of some process of riddance and conversion, whether radical or otherwise. Yet, in the turmoil of such a change, ‘I am not what I am’ (or the everyday ‘I am not myself’) still, surely, cannot be true, and if that is the case, Sartre must be being inocherent, and therefore, obfuscating and deliberately obscure, and hence, it seems, must properly be rejected by all right and clear thinking men. (shrink)

L’article part d’un constat élémentaire : les phénomènes de patrimonialisation se démultiplient et recouvrent toute sorte de réalités. Dans ce contexte, à côté de la recherche traditionnelle sur les questions de patrimoine, ils invitent à développer ce que dans le monde anglo-saxon de la recherche, on dénomme les heritage studies en mettant tout particulièrement l’accent sur la dimension critique de la recherche. Cette dernière ne doit plus chercher à établir, à consolider ou à préserver des patrimoines existants mais à (...) interroger ce qui fait patrimoine et les raisons pour lesquelles des acteurs se mobilisent et tendent à imposer une valeur symbolique à un objet, à une pratique ou à une coutume, non sans en tirer profit. (shrink)

L’article part d’un constat élémentaire : les phénomènes de patrimonialisation se démultiplient et recouvrent toute sorte de réalités. Dans ce contexte, à côté de la recherche traditionnelle sur les questions de patrimoine, ils invitent à développer ce que dans le monde anglo-saxon de la recherche, on dénomme les heritage studies en mettant tout particulièrement l’accent sur la dimension critique de la recherche. Cette dernière ne doit plus chercher à établir, à consolider ou à préserver des patrimoines existants mais à (...) interroger ce qui fait patrimoine et les raisons pour lesquelles des acteurs se mobilisent et tendent à imposer une valeur symbolique à un objet, à une pratique ou à une coutume, non sans en tirer profit. (shrink)

"Publié en 1994, traduit chez Vrin en 2007, L'esprit et le monde de John McDowell n'a cessé de susciter des débats dans le monde philosophique anglo-saxon, sur l'esprit, la connaissance, le langage et la nature, contribuant à définir de nouvelles questions. Pour la première fois, cette oeuvre, qui emprunte aussi bien à Wittgenstein, Strawson et Davidson qu'à Kant et Hegel, et tente de dépasser l'opposition traditionnelle entre la philosophie dite "continentale" et la philosophie dite "analytique", fait l'objet d'une lecture (...) critique en France. Les contributions ici rassemblées, ainsi que les réponses de John McDowell, font suite à une "première vague" de commentaires critiques qui lui furent adressés et qui le conduisirent à s'expliquer sur ses thèses et à en modifier légèrement quelques-unes (comme la thèse du contenu conceptuel de la perception). On trouvera ici, dans les différentes contributions, un éclairage sur les raisons et les portées de cette critique, et, dans les réponses, des formulations pour la plupart tout à fait inédites de McDowell."--Page 4 de la couverture. (shrink)

In this book, Michael R. Slater provides a new assessment of pragmatist views in the philosophy of religion. Focusing on the tension between naturalist and anti-naturalist versions of pragmatism, he argues that the anti-naturalist religious views of philosophers such as William James and Charles Peirce provide a powerful alternative to the naturalism and secularism of later pragmatists such as John Dewey and Richard Rorty. Slater first examines the writings of the 'classical pragmatists' - James, Peirce, and Dewey - (...) and argues for the relevance of their views for thinking about such topics as the nature of religion and the viability of natural theology. His final three chapters engage with the religious views of later pragmatists such as Rorty and Philip Kitcher, and with current philosophical debates over metaphysical realism, naturalism, and evidentialism. His book will be of particular interest to philosophers of religion, theologians, and specialists in American philosophy. (shrink)

The COVID-19 pandemic and global climate change crisis remind us that widespread trust in the products of the scientific enterprise is vital to the health and safety of the global community. Insofar as appropriate responses to these crises require us to trust that enterprise, cultivating a healthier trust relationship between science and the public may be considered as a collective public good. While it might appear that scientists can contribute to this good by taking more initiative to communicate their work (...) to public audiences, we raise a concern about unintended consequences of an individualistic approach to such communication. (shrink)

Do the laws of nature supervene on ordinary, non-nomic matters of fact? Lange's criticism of Humean supervenience (HS) plays a key role in his account of natural laws. Though we are sympathetic to his account, we remain unconvinced by his criticism. We focus on his thought experiment involving a world containing nothing but a lone proton and argue that it does not cast sufficient doubt on HS. In addition, we express some concern about locating the lawmakers in an ontology of (...) primitive subjunctive facts and suggest that a 'mixed' metaphysics to the lawmaker question might be attractive. (shrink)

This article focuses on the ethical implications of so-called ‘collateral damage’. It develops a moral typology of collateral harm to innocents, which occurs as a side effect of military or quasi-military action. Distinguishing between accidental and incidental collateral damage, it introduces four categories of such damage: negligent, oblivious, knowing and reckless collateral damage. Objecting mainstream versions of the doctrine of double effect, the article argues that in order for any collateral damage to be morally permissible, violent agents must comply with (...) high standards of care. In order for incidental harm to be permissible, an agent must take pains to avoid such harm even at higher cost to him- or herself. It is argued that accidentally but negligently caused collateral damage may be just as difficult to excuse as incidental harm. Only if high precautionary standards of care are met, can unintended harm to innocents – incidental or accidental – be permissible. In practice, such a strong commitment to avoiding harm to civilians may well lead us to question more generally and rethink more radically how violent conflicts ought to be fought, how military violence ought to be used and whether there are better ways of achieving those aims that we think are legitimate than those we are currently using. (shrink)

A fallibilist theory of knowledge is employed to make sense of the idea that agents know what they are doing 'without observation' (as on Anscombe's theory of practical knowledge).

WINNER BEST SOCIAL PHILOSOPHY BOOK IN 2021 / NASSP BOOK AWARD 2022 -/- Together we can often achieve things that are impossible to do on our own. We can prevent something bad from happening or we can produce something good, even if none of us could do it by herself. But when are we morally required to do something of moral importance together with others? This book develops an original theory of collective moral obligations. These are obligations that individual moral (...) agents hold jointly, but not as unified collective agents. To think of some of our obligations as joint or collective is the best way of making sense of our intuitions regarding collective moral action problems. Where we have reason to believe that our efforts are most efficient as part of a collective endeavor we may incur collective obligations together with others who are similarly placed as long as we are able to establish compossible individual contributory strategies towards that goal. The book concludes with a discussion of “massively shared obligations” to large-scale moral problems such as global poverty. (shrink)

The standard view of ignorance is that it consists in the mere lack of knowledge or true belief. Duncan Pritchard has recently argued, against the standard view, that ignorance is the lack of knowledge/true belief that is due to an improper inquiry. I shall call, Pritchard’s alternative account the Normative Account. The purpose of this article is to strengthen the Normative Account by providing an independent vargument supporting it.

COVID-19 vaccine refusal seems like a paradigm case of irrationality. Vaccines are supposed to be the best way to get us out of the COVID-19 pandemic. And yet many people believe that they should not be vaccinated even though they are dissatisfied with the current situation. In this paper, we analyze COVID-19 vaccine refusal with the tools of contemporary philosophical theories of responsibility and rationality. The main outcome of this analysis is that many vaccine-refusers are responsible for the belief that (...) they should not be vaccinated and epistemically rational in holding it. This is an important result because it provides insights into the legitimacy of certain public health policies. In particular, this result shows that a public health policy that would abandon the project of convincing certain vaccine-refusers with reasons – e.g., by simply making vaccination compulsory – is prima facie illegitimate. (shrink)

Together we can achieve things that we could never do on our own. In fact, there are sheer endless opportunities for producing morally desirable outcomes together with others. Unsurprisingly, scholars have been finding the idea of collective moral obligations intriguing. Yet, there is little agreement among scholars on the nature of such obligations and on the extent to which their existence might force us to adjust existing theories of moral obligation. What interests me in this paper is the perspective of (...) the moral deliberating agent who faces a collective action problem, i.e. the type of reasoning she employs when deciding how to act. I hope to show that agents have collective obligations precisely when they are required to employ ‘we-reasoning’, a type of reasoning that differs from I-mode, best response reasoning, as I shall explain below. More precisely, two (or more) individual agents have a collective moral obligation to do x if x is an option for action that is only collectively available (more on that later) and each has sufficient reason to rank x highest out of the options available to them. (shrink)

Local opposition to infrastructure projects implementing renewable energy (RE) such as wind farms is often strong even if state-wide support for RE is strikingly high. The slogan “Not In My BackYard” (NIMBY) has become synonymous for this kind of protest. This paper revisits the question of what is wrong with NIMBYs about RE projects and how to best address them. I will argue that local opponents to wind farm (and other RE) developments do not necessarily fail to contribute their fair (...) share to producing a desirable public good (clean energy). In fact, with landscape concerns being at the heart of much protest, the question of fair burden distribution becomes sidelined: landscape impacts cannot be distributed nor compensated for. Protests may be attempts to express a true conflict of (incommensurable) values. Understanding them as such will help us better address NIMBY concerns and overcome such opposition through ensuring procedural justice. (shrink)

Humans are prone to producing morally suboptimal and even disastrous outcomes out of ignorance. Ignorance is generally thought to excuse agents from wrongdoing, but little attention has been paid to group-based ignorance as the reason for some of our collective failings. I distinguish between different types of first-order and higher order group-based ignorance and examine how these can variously lead to problematic inaction. I will make two suggestions regarding our epistemic obligations vis-a-vis collective (in)action problems: (1) that our epistemic obligations (...) concern not just our own knowledge and beliefs but those of others, too and (2) that our epistemic obligations can be held collectively where the epistemic tasks cannot be performed by individuals acting in isolation, for example, when we are required to produce joint epistemic goods. (shrink)

"Deleuze plonge la critique kantienne transcendantale dans le bain dissolvant d'un empirisme renouvelé. Ce livre se propose de restituer cette entreprise, et d'analyser l'étonnante création de ce concept, que Deleuze mène depuis ses premières monographies jusqu'à Différence et Répétition dans un dialogue fécond avec l'histoire de la philosophie. Par quelles opérations de distorsion et de collage, Deleuze compose-t-il l'empirisme de Hume, la théorie du signe comme force de Nietzsche, le virtuel et les multiplicités de Bergson, les modes de Spinoza, les (...) individualisations impersonnelles de Simondon pour renouveler la théorie kantienne du transcendantal? C'est tout l'objet de cette enquête, qui permet d'entrer dans le laboratoire du penseur, pour saisir la philosophie se faisant, mais qui permet également d'expliquer l'insistance du transcendantal dans toute son oeuvre"--P. [4] of cover. (shrink)

This article explores the themes of trust and ethical conduct in social research, with particular attention to the trust that can develop between the members of a research team as well as between researchers and the researched. The authors draw upon a three-year empirical study of destinations and outcomes for young people excluded from alternative educational provision. They also make reference to a contemporary exposition of Aristotle's writing on friendship in order to explore two sets of relevant distinctions that have (...) a bearing upon our understanding of relationships that emerge in the context of social research projects. These distinctions are between impartiality and selectivity on the one hand, and between universality and particularity on the other. The authors attempt to demonstrate that these distinctions influence the development of trust and the conduct of ethical research, arguing that the latter is not synonymous with compliance to ethical guidelines. (shrink)

It is often argued that our obligations to address structural injustice are collective in character. But what exactly does it mean for ‘ordinary citizens’ to have collective obligations visà- vis large-scale injustice? In this paper, I propose to pay closer attention to the different kinds of collective action needed in addressing some of these structural injustices and the extent to which these are available to large, unorganised groups of people. I argue that large, dispersed and unorganised groups of people are (...) often in a position to perform distributive collective actions. As such, ordinary citizens can have massively shared obligations to address structural injustice through distributive action, but, ultimately, such obligations are ‘collective’ only in a fairly weak sense. (shrink)

Joe Campbell has identified an apparent flaw in van Inwagen’s Consequence Argument. It apparently derives a metaphysically necessary conclusion from what Campbell argues is a contingent premise: that the past is in some sense necessary. I criticise Campbell’s examples attempting to show that this is not the case (in the requisite sense) and suggest some directions along which an incompatibilist could reconstruct her argument so as to remain immune to Campbell’s worries.

This chapter provides a high-level introduction to the topic of propaganda. We survey a number of the most influential accounts of propaganda, from the earliest institutional studies in the 1920s to contemporary academic work. We propose that these accounts, as well as the various examples of propaganda which we discuss, all converge around a key feature: persuasion which bypasses audiences’ rational faculties. In practice, propaganda can take different forms, serve various interests, and produce a variety of effects. Propaganda can aim (...) to affect not only audiences’ beliefs and attitudes, but also their emotions and moods, and in turn how audiences subsequently reason or act. While propaganda is often thought of as false or misinformation, it can instead involve framing effects (“The war on drugs”), covert messaging (“There are Muslims among us”), emotionally charged slogans (“Make America Great Again”), or myths (“The American dream”). These forms of propaganda mislead audiences, not by introducing false information, but by making some beliefs and values, rather than others, salient. In fact, propaganda can even employ straightforwardly true claims (again, as in “There are Muslims among us”) and seemingly objective bureaucratic reports (“Crime has risen 4.2%”). To understand how these and other mechanisms enable propaganda to persuade by arational means, further study is needed. To that end, throughout the chapter we identify a number of places where the study of meaning and communication can help elucidate propaganda, as well as the places where propaganda issues challenges for the study of meaning. (shrink)

The challenges facing us today require practical wisdom to allow us to react appropriately. In this paper, we argue that at a group level, we will make better decisions if we respect and take into account the moral judgment of agents with diverse styles of cognition and moral reasoning. We show this by focusing on the example of autism, highlighting different strengths and weaknesses of moral reasoning found in autistic and non-autistic persons respectively.

Die vorliegende Schrift unternimmt eine Revision des vorherrschenden Bildes der Rolle und der Konzeptionen von Moral und Ethik im Wiener Kreis. Dieses Bild wird als zu einseitig und undifferenziert zurückgewiesen. Die Ansicht, die Mitglieder des Wiener Kreises hätten kein Interesse an Moral und Ethik gezeigt, wird widerlegt. Viele Mitglieder waren nicht nur moralisch und politisch interessiert, sondern auch engagiert. Des Weiteren vertraten nicht alle die Standardauffassung logisch-empiristischer Ethik, die neben der Anerkennung deskriptiv-empirischer Untersuchungen durch die Ablehnung jeglicher normativer und inhaltlicher (...) Ethik und der Verfechtung eines extremen Nonkognitivismus geprägt ist. Am meisten entspricht die Standardauffassung den Ansichten Rudolf Carnaps, weniger bereits jenen Karl Mengers, Otto Neuraths oder Philipp Franks. Am weitesten weichen Moritz Schlick, Victor Kraft sowie Herbert Feigl von der Standardauffassung ab. Entgegen dem herkömmlichen Bild weltabgewandter Logiker und Metaethiker wurde im Wiener Kreis sogar Angewandte Ethik betrieben, und dies bereits unter diesem Namen. Neben den ethischen Hauptthemen und Ansichten der jeweiligen Philosophen in ihrer Entwicklung im Rahmen ihres persönlichen und kulturellen Kontextes zeigt die Untersuchung, dass allen Ansätzen eine aufgeklärte und humanistische Version von Moral und Ethik gemeinsam ist. Dieser wissenschaftliche Humanismus, der sich schon in der Programmschrift Wissenschaftliche Weltauffassung. Der Wiener Kreis findet, liegt jedoch in verschiedenen Ausprägungen vor. Was die Abweichungen von der Standardauffassung wesentlich betrifft, ist ihre unterschiedliche Auffassung von Moral als gemeinsames oder individuelles Unternehmen. Carnap führt ein extremer Individualismus zu einem extremen Nonkognitivismus, in dem ihm Menger folgt. Bei Schlick ist die Lage zweideutig, was sich in unterschiedlichen Moralbegriffen widerspiegelt. Bei Kraft und Feigl tritt das Verständnis von Moral als gemeinschaftlich geteilte Praxisform klar hervor. Auf der Basis eines gemeinsamen Begriffs des moralisch Guten, der auch eine Sachkomponente enthält, ist eine Verständigung über moralische Fragen möglich. Von einem extremen Nonkognitivismus kann dort nicht mehr die Rede sein. Mit diesen Ergebnissen verbietet es sich, dem Wiener Kreis allgemein eine Ablehnung normativer Ethik und einen extremen Nonkognitivismus zuzuschreiben. Eine systematische Ethik, die Moral als Gemeinschaftspraxis begreift, steht einigen im Wiener Kreis näher, als das vorherrschende Bild suggerieren möge. Wer meint, mit engem Bezug zur Tradition des Wiener Kreises nur Carnap folgen zu können und Ethik als suspektes Unternehmen betrachten zu müssen, irrt. Ethik war in der Tradition Analytischer Philosophie nicht immer so marginalisiert, wie sie es in manchen ihrer Teilrichtungen heute noch ist und Gegner(innen) der Analytischen Philosophie vorwerfen. Die vorliegende Untersuchung liefert die nötige Revision einer verfänglichen Fehlentwicklung. (shrink)

The book presents a new conceptual framework and a set of research principles with which to study and interpret technology from a phenomenological perspective.

Review of extant research on the corporate environmental performance (CEP) and corporate financial performance (CFP) link generally demonstrates a positive relationship. However, some arguments and empirical results have demonstrated otherwise. As a result, researchers have called for a contingency approach to this research stream, which moves beyond the basic question “does it pay to be green?” and instead asks “when does it pay to be green?” In answering this call, we provide a meta-analytic review of CEP–CFP literature in which we (...) identify potential moderators to the CEP–CFP relationship including environmental performance type (e.g., reactive vs. proactive performance), firm characteristics (e.g., large vs. small firms), and methodological issues (e.g., self-report measures). By analyzing these contingencies, this study attempts to provide a basis on which to draw conclusions regarding some inconsistencies and debates in the CEP–CFP research. Some of the results of the moderator analysis suggest that small firms benefit from environmental performance as much or more than large firms, US firms seem to benefit more than international counterparts, and environmental performance seems to have the strongest influence on market-measures of financial performance. (shrink)

In this article, I will consider whether, and in what way, doxastic states can harm. I’ll first consider whether, and in what way, a person’s doxastic state can harm her, before turning to the question of whether, and in what way, it can harm someone else.

Many philosophers have defended the view that we are subject to the following evidential ought: “One ought to believe in accordance with one's evidence.” Although they agree on this, a more fundamental question keeps dividing them: from where does the evidential ought derive its normative force? The instrinsicalist answer to this question is sometimes described as the claim that "there is a brute epistemic value in believing in accordance with one's evidence" (Cowie, 2014, 4005). But what does this really mean? (...) Intrinsicalists' negative claim is that the normative source of the evidential ought has nothing to do with the fulfilment of our epistemic purposes. But what is their positive claim exactly? This paper aims at improving our understanding of intrinsicalism. Its conclusion is that there is only one possible way of being an intrinsicalist. Intrinsicalists need to be constitutivists. (shrink)

In a previous issue of Philosophical Investigations Professor Radford provides a counterexample to the equation1: a word is on the tip of a man's tongue IFF (a) he can recognize the word and (b1) he believes he may be able to produce It (fairly soon).

Two uses of ‘if are discussed which do not involve conditions. The first is illustrated in the example ‘If he's here, I don't see him’, the second in ‘He's not a dunce, if a trifle stupid’. A third non‐conditional use, cognate with the first is also mentioned: it would be illustrated in the example ‘If he's a Dutchman, I'll eat my hat’. It is argued that recent attempts to formulate a logic of conditionals have distorted our understanding of ‘if, by (...) ignoring these uses, sometimes deliberately. Specifically, as a result, many arguments involving ‘if have been misjudged as invalid, because the expectation has been that ‘if expresses a condition. It is suggested that the traditional analysis of ‘necessary and sufficient conditions’ in terms of ‘if and only if, is partly to blame for these misunderstandings. And the proper understanding of ‘if’ which emerges shows it is quite fully captured in the propositional calculus. (shrink)

One of the claims made for C. S. Peirce's existential graphs has been that they are a deductively complete formulation of first-order logic with identity. As Peirce presented them, this is true only for certain versions of first-order logic :those which do not include terms for individuals. I amend Peirce's rules here, showing, in particular, how they are capable of demonstrating that, for instance, ?Jack is in the kitchen? contradicts ?Jack is not in the kitchen?