A study is reported testing two hypotheses about a close parallel relation between indicative conditionals, if A then B , and conditional bets, I bet you that if A then B . The first is that both the indicative conditional and the conditional bet are related to the conditional probability, P(B|A). The second is that de Finetti's three-valued truth table has psychological reality for both types of conditional— true , false , or void for indicative conditionals and win , lose (...) , or void for conditional bets. The participants were presented with an array of chips in two different colours and two different shapes, and an indicative conditional or a conditional bet about a random chip. They had to make judgements in two conditions: either about the chances of making the indicative conditional true or false or about the chances of winning or losing the conditional bet. The observed distributions of responses in the two conditions were generally related to the conditional probability, supporting the first hypothesis. In addition, a majority of participants in further conditions chose the third option, “void”, when the antecedent of the conditional was false, supporting the second hypothesis. (shrink)

The new paradigm in the psychology of reasoning adopts a Bayesian, or prob- abilistic, model for studying human reasoning. Contrary to the traditional binary approach based on truth functional logic, with its binary values of truth and falsity, a third value that represents uncertainty can be introduced in the new paradigm. A variety of three-valued truth table systems are available in the formal literature, including one proposed by de Finetti. We examine the descriptive adequacy of these systems for natural language (...) indicative condi- tionals and bets on conditionals. Within our framework the so-called “defective” truth table, in which participants choose a third value when the antecedent of the indicative conditional is false, becomes a coherent response. We show that only de Finetti’s system has a good descriptive fit when uncer- tainty is the third value. (shrink)

This paper aims to make explicit the methodological conditions that should be satisfied for the Bayesian model to be used as a normative model of human probability judgment. After noticing the lack of a clear definition of Bayesianism in the psychological literature and the lack of justification for using it, a classic definition of subjective Bayesianism is recalled, based on the following three criteria: an epistemic criterion, a static coherence criterion and a dynamic coherence criterion. Then it is shown that (...) the adoption of this framework has two kinds of implications. The first one regards the methodology of the experimental study of probability judgment. The Bayesian framework creates pragmatic constraints on the methodology that are linked to the interpretation of, and the belief in, the information presented, or referred to, by an experimenter in order for it to be the basis of a probability judgment by individual participants. It is shown that these constraints have not been satisfied in the past, and the question of whether they can be satisfied in principle is raised and answered negatively. The second kind of implications consists of two limitations in the scope of the Bayesian model. They regard (1) the background of revision (the Bayesian model considers only revising situations but not updating situations), and (2) the notorious case of the null priors. In both cases Lewis’ rule is an appropriate alternative to Bayes’ rule, but its use faces the same operational difficulties. (shrink)

Psychological research on people’s understanding of natural language connectives has traditionally used truth table tasks, in which participants evaluate the truth or falsity of a compound sentence given the truth or falsity of its components in the framework of propositional logic. One perplexing result concerned the indicative conditional if A then C which was often evaluated as true when A and C are true, false when A is true and C is false but irrelevant“ (devoid of value) when A is (...) false (whatever the value of C). This was called the “psychological defective table of the conditional.” Here we show that far from being anomalous the “defective” table pattern reveals a coherent semantics for the basic connectives of natural language in a trivalent framework. This was done by establishing participants’ truth tables for negation, conjunction, disjunction, conditional, and biconditional, when they were presented with statements that could be certainly true, certainly false, or neither. We review systems of three-valued tables from logic, linguistics, foundations of quantum mechanics, philosophical logic, and artificial intelligence, to see whether one of these systems adequately describes people’s interpretations of natural language connectives. We find that de Finetti’s (1936/1995) three-valued system is the best approximation to participants’ truth tables. (shrink)

The Bayesian model has been used in psychology as the standard reference for the study of probability revision. In the first part of this paper we show that this traditional choice restricts the scope of the experimental investigation of revision to a stable universe. This is the case of a situation that, technically, is known as focusing. We argue that it is essential for a better understanding of human probability revision to consider another situation called updating (Katsuno & Mendelzon, 1992), (...) in which the universe is evolving. In that case the structure of the universe has definitely been transformed and the revision message conveys information on the resulting universe. The second part of the paper presents four experiments based on the Monty Hall puzzle that aim to show that updating is a natural frame for individuals to revise their beliefs. (shrink)

The Bayesian model is used in psychology as the reference for the study of dynamic probability judgment. The main limit induced by this model is that it confines the study of revision of degrees of belief to the sole situations of revision in which the universe is static (revising situations). However, it may happen that individuals have to revise their degrees of belief when the message they learn specifies a change of direction in the universe, which is considered as changing (...) with time (updating situations). We analyze the main results of the experimental literature with regard to elementary qualitative properties of these two situations of revision. First, the order effect phenomenon is confronted with the commutative property. Second, an apparent new phenomenon is presented: the redundancy effect that is confronted with the idempotence property. Finally, results obtained in this kind of experimental situations are reinterpreted in the light of pragmatic analysis. (shrink)

The Monty-Hall Problem ($MHP$) has been used to argue against a subjectivist view of Bayesianism in two ways. First, psychologists have used it to illustrate that people do not revise their degrees of belief in line with experimenters' application of Bayes' rule. Second, philosophers view $MHP$ and its two-player extension ($MHP2$) as evidence that probabilities cannot be applied to single cases. Both arguments neglect the Bayesian standpoint, which requires that $MHP2$ (studied here) be described in different terms than usually applied (...) and that the initial set of possibilities be stable (i.e., a focusing situation). This article corrects these errors and reasserts the Bayesian standpoint; namely, that the subjective probability of an event is always conditional on a belief reviser's specific current state of knowledge. (shrink)

The poor performances of typically developing children younger than 4 in the first-order false-belief task “Maxi and the chocolate” is analyzed from the perspective of conversational pragmatics. An ambiguous question asked by an adult experimenter (perceived as a teacher) can receive different interpretations based on a search for relevance, by which children according to their age attribute different intentions to the questioner, within the limits of their own meta-cognitive knowledge. The adult experimenter tells the child the following story of object-transfer: (...) “Maxi puts his chocolate into the green cupboard before going out to play. In his absence, his mother moves the chocolate from the green cupboard to the blue one.” The child must then predict where Maxi will pick up the chocolate when he returns. To the child, the question from an adult (a knowledgeable person) may seem surprising and can be understood as a question of his own knowledge of the world, rather than on Maxi's mental representations. In our study, without any modification of the initial task, we disambiguate the context of the question by (1) replacing the adult experimenter with a humanoid robot presented as “ignorant” and “slow” but trying to learn and (2) placing the child in the role of a “mentor” (the knowledgeable person). Sixty-two typical children of 3 years-old completed the first-order false belief task “Maxi and the chocolate,” either with a human or with a robot. Results revealed a significantly higher success rate in the robot condition than in the human condition. Thus, young children seem to fail because of the pragmatic difficulty of the first-order task, which causes a difference of interpretation between the young child and the experimenter. (shrink)

The Sleeping Beauty problem is presented in a formalized framework which summarizes the underlying probability structure. The two rival solutions proposed by Elga and Lewis differ by a single parameter concerning her prior probability. They can be supported by considering, respectively, that Sleeping Beauty is “fuzzy-minded” and “blank-minded”, the first interpretation being more natural than the second. The traditional absent -minded driver problem is reinterpreted in this framework and sustains Elga’s solution.

There is a new Bayesian, or probabilistic, paradigm in the psychology of reasoning, with new psychological accounts of the indicative conditional of natural language. In psychological experiments in this new paradigm, people judge that the probability of the indicative conditional, P(if A then C), is the conditional probability of C given A, P(C | A). In other experiments, participants respond with what has been called the 'de- fective' truth table: they judge that if A then C is true when A (...) holds and C holds, is false when A holds and C does not, and is neither true nor false when A does not hold. We argue that these responses are not 'defective' in any negative sense, as many psychologists have implied. We point out that a number of normative researchers, including de Finetti, have proposed such a table for various coherent interpretations of the third value. We review the relevant general tables in the normative literature, in which there is a third value for A and C and the logically compound forms of the natural language conditional, negation, conjunction, disjunction, and the material conditional. We describe the results of an experiment on which of these tables best describes ordinary people's judgements when the third value is interpreted as indicating uncertainty. (shrink)

ABSTRACTThe new paradigm in the psychology of reasoning redirects the investigation of deduction conceptually and methodologically because the premises and the conclusion of the inferences are assumed to be uncertain. A probabilistic counterpart of the concept of logical validity and a method to assess whether individuals comply with it must be defined. Conceptually, we used de Finetti's coherence as a normative framework to assess individuals' performance. Methodologically, we presented inference schemas whose premises had various levels of probability that contained non-numerical (...) expressions and, as a control, sure levels. Depending on the inference schemas, from 60% to 80% of the participants produced coherent conclusions when the premises were uncertain. The data also show that except for schemas involving conjunction, performance was consistently lower with certain than uncertain premises, the rate of conjunction fallacy was consistently low (not exceeding 20%,.. (shrink)

In this paper, Knetsch's exchange paradigm is analyzed from the perspective of pragmatics and social norms. In this paradigm the participant, at the beginning of the experiment, receives an object from the experimenter and at the end, the same experimenter offers to exchange the received object for an equivalent object. The observed refusal to exchange is called the endowment effect. We argue that this effect comes from an implicature made by the participant about the experimenter's own expectations. The participant perceives (...) the received item as a gift, or as a present, from the experimenter that cannot be exchanged as stipulated by the social norms of western politeness common to both the experimenter and the participant. This implicature, however, should not be produced by participants from Kanak culture for whom the perceived gift of a good will be interpreted as a first act of exchange based on gift and counter-gift. This exchange is a natural, frequent, balanced, and indispensable act for all Kanak social bonds whether private or public. Kanak people also know the French social norms that they apply in their interactions with French people living in New Caledonia. In our experiment, we show that when the exchange paradigm takes place in a French context, with a French experimenter and in French, the Kanak participant is subject to the endowment effect in the same way as a French participant. On the other hand, when the paradigm is carried out in a Kanak context, with a Kanak experimenter and in the vernacular language, or in a Kanak context that approaches the ceremonial of the custom, the endowment effect is no longer observed. The same number of Kanak participants accept or refuse to exchange the endowed item. These results, in addition to providing a new explanation for the endowment effect, highlight the great flexibility of decisions according to social-cultural context. (shrink)

Thought: A Journal of Philosophy, Volume 10, Issue 1, Page 42-52, March 2021.

The pigeonhole principle is a well-known mathematical principle and is quite simple to understand. It goes as follows: If n items are placed into m containers, and if m (...) an identifier (nominal). They suggest quantities first need to be turned into categories. We believe this difference can instead be explained by pragmatic factors not taken into account in their study. We disambiguate the problems given to participants and study the effects of their disambiguation and the influence of different kinds of quantities: countable and mass. We show that using a problem with countable quantities instead of hair, usually understood as non-countable, increase the performance of participants, no longer distinguishable from that of the nominal problem. (shrink)

A conceptual and mathematical model of a social community behavior in a choice situation under a veil of ignorance, where two alternative policies—Rawlsian maximin and Harsanyian utilitarianism—can be implemented through the aggregation of individual preferences over these two policies, is constructed and investigated. We first incorporate in our conceptual model psychological features such as risk-aversion and prosocial preferences that likely underlie choices of welfare policies. We secondly develop and select the mathematical model presented it by means of an autonomous system (...) of ordinary differential equations. A qualitative analysis of this system global phase-plane behavior shows possible tendencies of community development under social choices over Rawlsian or utilitarian societies depending on psychological parameters such as risk aversion and prosocial preferences. (shrink)

Causal induction in the real world often has to be quick and efficient as well as accurate. We propose that people use two different frames to achieve these goals. The A-frame consists of heuristic processes that presuppose rarity and can detect causally relevant factors quickly. The B-frame consists of analytic processes that can be highly accurate in detecting actual causes. Our dual frame theory implies that several factors affect whether people use the A-frame or the B-frame in causal induction: among (...) these are symmetrical negation, intervention and commitment. This theory is tested and sustained in two experiments. The results also provide broad support for dual process accounts of human thinking in general. (shrink)

According to the weak version of linguistic relativity, also called the Sapir-Whorf hypothesis, the features of an individual’s native language influence his worldview and perception. We decided to test this hypothesis on the sufficient conditional and the necessary conditional, expressed differently in Chinese and French. In Chinese, connectors for both conditionals exist and are used in everyday life, while there is only a connector for the sufficient conditional in French. A first hypothesis follows from linguistic relativity: for the necessary conditional, (...) better logic performance is expected in Chinese participants rather than French participants. As a second hypothesis, for all participants, we expect performance on the sufficient conditional to be better than on the necessary conditional. Indeed, despite the isomorphism of the two conditionals, they differ in how information is processed for reasoning. We decided to study reasoning under uncertainty as it reflects reality more accurately. To do so, we analyzed the coherence of participants using de Finetti’s theory for deduction under uncertainty. The results of our study show no significant difference in performance between Chinese and French participants, neither on the sufficient conditional nor on the necessary conditional. Thus, our first hypothesis derived from the weak version of linguistic relativity is not confirmed. In contrast, our results confirm the second hypothesis in two out of three inference schemas. (shrink)

The possible and revelation -- The saturated phenomenon -- Metaphysics and phenomenology: a relief for theology -- "Christian philosophy": hermeneutic or heuristic? -- Sketch of a phenomenological concept of the gift -- What cannot be said: Apophasis and the discourse of love -- The banality of saturation -- Faith and reason.

This collection of writings by Jean-Luc Nancy, the renowned French critic and poet, delves into the history of philosophy to locate a fundamentally poetic modus operandi there. The book represents a daring mixture of Nancy’s philosophical essays, writings about artworks, and artwork of his own. With theoretical rigor, Nancy elaborates on the intrinsic multiplicity of art as a concept of “making,” and outlines the tensions inherent in the faire, the “making” that characterizes the very process of production and thereby (...) the structure of poetry in all its forms. Nancy shows that this multiplication that belongs to the notion of art makes every single work communicate with every other, all material in the artwork appeal to some other material, and art the singular plural of a praxis of the finite imparting of an infinity which is actually there in every utterance. In the collection, Nancy engages with the work of, among others, François Martin, Maurice Blanchot, and On Kawara. (shrink)

Le XXe siècle a été celui d'un éclatement sans précédent des formes traditionnelles de l'art, et donc aussi de son essence ou de son "idée". Est-ce à dire qu'un héritage entier de sens et de culture a été dilapidé en cet âge qu'on a dit être celui de la "fin de l'art"? Doit-on au contraire penser qu'héritage il y a bel et bien eu, sur un mode critique et selon des logiques qui ne firent peut-être pas sans raison? Loin d'être (...) dépourvus de sens, les signes contemporains de l'art - restes, bribes, traces, "symptômes" divers - sollicitent en fait plus que jamais les interprétations. C'est pourquoi nous avons estimé pouvoir, et même devoir, poser les questions suivantes : - Que fait donc l'art, de lui-même et de son histoire, à l'époque de son an-archie eidétique? - Que peuvent en dire aujourd'hui les théories esthétiques et philosophiques? - Sous quelle forme de fidélité critique à leur tradition respective le peuvent-elles? (shrink)

La philosophie consiste à donner un autre nom à ce qui a été longtemps cristallisé sous le nom de Dieu » : quel sort réserver à cet énoncé de Merleau-Ponty? Ces Leçons, qui se focalisent sur quelques désignations emblématiques de l’absolu dans la philosophie moderne, débutent avec le « non-autre » forgé par Nicolas de Cues dans le dernier de ses dialogues philosophiques. En interrogeant successivement la façon dont Descartes, Spinoza, Kant et Schelling ont redéfini l’absolu et les conséquences qu’ils (...) en ont tirées pour la formulation de la question de Dieu, il s’agit de problématiser la notion du « tout autre », décliné de différentes manières dans les Miettes philosophiques de Kierkegaard, la théologie dialectique de Karl Barth, la phénoménologie du sacré de Rudolf Otto et, plus près de nous, chez Heidegger et Derrida. En analysant quelques nœuds remarquables de l’arc historique qui relie ces deux désignations, il s’agit de mieux comprendre le projet de la théologie philosophique moderne et de donner une profondeur de champ historique aux débats contemporains relatifs à l’« onto-théologie », l’« idolâtrie conceptuelle » et les « théologies négatives ». (shrink)

On a l’habitude de lire dans Antigone l’histoire d’un conflit entre d’un côté l’expression des liens affectifs et de la piété, et de l’autre les prérogatives de l’État dont le but premier serait le maintien des institutions. D’un côté Antigone fidèle à son frère, de l’autre Créon attaché à sa Cité. D’un côté la morale de l’affectivité ou de la conviction (Gesinnungsethik), de l’autre la morale de la responsabilité (Verantwortungsethik), pour parler comme Max Weber. Cette lecture classique de la tragédie (...) demeure sans doute pertinente à bien des égards, mais traduit-elle l’essentiel? Et si l’intention du poète n’avait pas été d’en rester à cette confrontation mais de suggérer, par-delà l’affrontement ruineux, une troisième voie possible? Il n’y aurait plus alors deux termes seulement, le privé et le public que tout sépare, mais deux manières pour l’ordre public lui-même de se rapporter au privé, l’une conflictuelle et tyrannique, celle de Créon, l’autre conciliatrice et délibérative – démocratique en ce sens –, celle défendue par Hémon, par Tirésias, et finalement peut-être par Sophocle lui-même qui, par l’emploi d’un vocabulaire tiré de l’expérience politique athénienne, dénoue d’une main l’intrigue qu’il noue de l’autre. Éclairée entre autres par Aristote, une interprétation nouvelle de la pièce en découle, celle d’un poète qui surjoue les conflits pour mieux insinuer les moyens politiques de les résoudre ou de les atténuer. (shrink)

L’édition critique des œuvres de Moïse ben Sabbataï, philosophe juif actif (à Rome?) vers 1340, avait signalé, parmi d’autres sources latines lues dans les traductions en hébreu de son contemporain Juda de Rome, un exemplum présentant le sage athénien Solon sur son lit de mort en champion de la doctrine de l’élévation intellectuelle en vue de la vie éternelle. Cette note identifie comme sa source un chapitre d’Albert le Grand, De natura et origine animae II, 13, dont la traduction en (...) hébreu se trouve dans un ouvrage inédit de Juda de Rome, son Commentaire du Qaddīš et de la Qeduššāh. La traduction du chapitre est éditée, l’histoire de l’ exemplum reconstituée et son emploi par les trois auteurs, remis en contexte et interprété. (shrink)

If anything marks the image, it is a deep ambivalence. Denounced as superficial, illusory, and groundless, images are at the same time attributed with exorbitant power and assigned a privileged relation to truth. In this collection of writings on images and visual art, the author explores this through an extraordinary range of references.

The new Bayesian paradigm in the psychology of reasoning aims to integrate the study of human reasoning, decision making, and rationality. It is supported by two findings. One, most people judge the probability of the indicative conditional, P(if A then B), to be the conditional probability, P(B|A), as implied by the Ramsey test. Two, they judge if A then B to be void when A is false. Their three-valued response table used to be called ‘defective’, but should be termed the (...) de Finetti table. We show how to study general de Finetti truth tables for negations, conjunctions, disjunctions, and conditionals. (shrink)

Contractarianism in some form has been at the center of recent debates in moral and political philosophy. Jean Hampton was one of the most gifted philosophers involved in these debates and provided both important criticisms of prominent contractarian theories plus powerful defenses and applications of the core ideas of contractarianism. In these essays, she brought her distinctive approach, animated by concern for the intrinsic worth of persons, to bear on topics such as guilt, punishment, self-respect, family relations, and the (...) maintenance and justification of the state. Edited by Daniel Farnham, this collection is an essential contribution to understanding the problems and prospectus of contractarianism in moral, legal and political philosophy. (shrink)

One of the strongest strands in Nancy's philosophy is an attempt to rethink community and the very idea of the social in a way that does not ground these ideas in some individual subject or subjectivity. The fundamental argument of this book is that being is always 'being with', that 'I' is not prior to 'we', that existence is essentially co-existence. He thinks this being together, not as a comfortable enclosure in a pre-existing group, but as a mutual abandonment and (...) exposure to each other, one that would preserve the 'I' and its freedom in a mode of imagining community as neither a 'society of spectacle' nor via some form of 'authenticity'. (shrink)

Along with Husserl's Ideas and Heidegger's Being and Time, Being Given is one of the classic works of phenomenology in the twentieth century. Through readings of Kant, Husserl, Heidegger, Derrida, and twentieth-century French phenomenology (e.g., Merleau-Ponty, Levinas, and Henry), it ventures a bold and decisive reappraisal of phenomenology and its possibilities. Its author's most original work to date, the book pushes phenomenology to its limits in an attempt to redefine and recover the phenomenological ideal, which the author argues has never (...) been realized in any of the historical phenomenologies. Against Husserl's reduction to consciousness and Heidegger's reduction to Dasein, the author proposes a third reduction to givenness, wherein phenomena appear unconditionally and show themselves from themselves at their own initiative. Being Given is the clearest, most systematic response to questions that have occupied its author for the better part of two decades. The book articulates a powerful set of concepts that should provoke new research in philosophy, religion, and art, as well as at the intersection of these disciplines. Some of the significant issues it treats include the phenomenological definition of the phenomenon, the redefinition of the gift in terms not of economy but of givenness, the nature of saturated phenomena, and the question “Who comes after the subject?” Throughout his consideration of these issues, the author carefully notes their significance for the increasingly popular fields of religious studies and philosophy of religion. Being Given is therefore indispensable reading for anyone interested in the question of the relation between the phenomenological and the theological in Marion and emergent French phenomenology. (shrink)

The new Bayesian paradigm in the psychology of reasoning aims to integrate the study of human reasoning, decision making, and rationality. It is supported by two findings. One, most people judge the probability of the indicative conditional, P, to be the conditional probability, P, as implied by the Ramsey test. Two, they judge if A then B to be void when A is false. Their three‐valued response table used to be called ‘defective’, but should be termed the de Finetti table. (...) We show how to study general de Finetti truth tables for negations, conjunctions, disjunctions, and conditionals. (shrink)

This major study of Hobbes's political philosophy draws on recent developments in game and decision theory to explore whether the thrust of the argument in Leviathan, that it is in the interests of the people to create a ruler with absolute power, can be shown to be cogent. Professor Hampton has written a book of vital importance to political philosophers, political and social scientists, and intellectual historians.

Jean Greisch a soixante ans. A l'occasion de cet anniversaire, trente de ses collègues et amis de divers continents ont souhaité unir leurs réflexions à ce que son œuvre, désormais considérable, inspire sur les différentes scènes de la pensée. La thématique générale, qui constitue l'intitulé du présent volume, est emblématique d'une production singulière : passage entre les deux langues de son Luxembourg natal, entre la phénoménologie et la philosophie de la religion, entre la métaphysique et la théologie, entre les (...) sciences humaines et l'herméneutique, entre la poésie et l'éthique. Enseignant, traducteur, conférencier international et auteur, il continue de frayer différents types de passages : dresser des ponts, ouvrir des brèches, risquer des percées, souffrir des traversées, ménager des transitions, inventer des tracés. (shrink)

Le comte Joseph de Maistre fut un ennemi radical des Lumières.

Dans les sociétés démocratiques contemporaines, les individus revendiquent le droit d'aimer librement. Ils sont attachés à la réussite de leur vie sentimentale et à l'épanouissement de leur sexualité. Mais le corps épris nous permet-il d'accéder à l'existence heureuse que nous désirons? Dans ce livre, Jean-Marie Frey met au jour les ressorts de l'inquiétude suscitée par l'amour charnel. Il montre comment la pudibonderie et le libertinage expriment, chacun à leur manière, une tentative pour se rassurer. Les prudes désireux de voiler (...) les femmes et les libertins exhibant un corps morcelé dans l'imagerie pornographique, n'éprouvent-ils pas les uns et les autres une crainte devant la chair désirable? L'auteur oppose les figures du pudibond et du libertin à celle d'un amant disposé à jouer le jeu d'une passion amoureuse à la fois inquiétante et joyeuse. (shrink)

In this book it explores science and technology, makes connections between these epistemic, cultural, and political trends, and develops profound insights into the nature of our postmodernity.

The last and most poignant of these essays is The Intruder, Nancys philosophical meditation on his heart transplant.

Ce recueil vise à interroger un versant moins connu, mais essentiel, de la pensée de Gadamer, sa méditation des philosophes grecs, des Présocratiques à Plotin, qui occupe un tiers de ses œuvres complètes.