In this target article we question the assumption that perception is divided into separate domains of vision, hearing, touch, taste, and smell. We review implications of this assumption for theories of perception and for our understanding of ambient energy arrays (e.g., the optic and acoustic arrays) that are available to perceptual systems. We analyze three hypotheses about relations between ambient arrays and physical reality: (1) that there is an ambiguous relation between ambient energy arrays and physical reality, (2) that there (...) is a unique relation between individual energy arrays and physical reality, and (3) that there is a redundant but unambiguous relation, within or across arrays, between energy arrays and physical reality. This is followed by a review of the physics of motion, focusing on the existence and status of referents for physical motion. Our review indicates that it is not possible, in principle, for there to be a unique relation between physical motion and the structure of individual energy arrays. We argue that physical motion relative to different referents is specified only in the global array, which consists of higher-order relations across different forms of energy. The existence of specificity in the global array is consistent with the idea of direct perception, and so poses a challenge to traditional, inference-based theories of perception and cognition. However, it also presents a challenge to much of the ecological approach to perception and action, which has accepted the assumption of separate senses. (shrink)

In human groups performing oscillatory tasks, it has been observed that the frequency of participants' oscillations reduces when compared to that acquired in solo. This experimental observation is not captured by the standard Kuramoto oscillators, often employed to model human synchronization. In this work, we aim at capturing this observed phenomenon by proposing three alternative modifications of the standard Kuramoto model that are based on three different biologically-relevant hypotheses underlying group synchronization. The three models are tuned, validated and compared against (...) experiments on a group synchronization task, which is a multi-agent extension of the so-called mirror game. (shrink)

Bodily expression of felt emotion has been documented in the literature. However, it is often associated with high motor variability between individuals. This study aimed to identify individual motor signature of emotions. IMS is a new method of motion analysis and visualization able to capture the subtle differences in the way each of us moves, seen as a kinematic fingerprint. We hypothesized that the individual motor signature would be different depending on the induced emotional state and that an emotional motor (...) signature of joy and sadness common to all participants would emerge. For that purpose, we elicited these emotions in 26 individuals using an autobiographical memory paradigm, before they performed a motor improvization task. We extracted the individual motor signature under each emotional condition. Participants completed a self-report emotion before and after each trial. Comparing the similarity indexes of intra- and inter-emotional condition signatures, we confirmed our hypothesis and showed the existence of a specific motor signature for joy and sadness, allowing us to introduce the notion of emotional individual motor signature. Our study indicates that EIMS can reinforce emotion discrimination and constitutes the first step in modeling emotional behavior during individual task performances or social interactions. (shrink)

We discuss issues raised by the commentators, such as specification in single-energy arrays, task-specific pickup of information, general principles of the ecological approach to perception and action, and how specification may be constrained by the facts of physical relativity. While the commentaries raise many important issues we conclude that they do not undermine our argument that specification exists solely in the global array.

The new commentaries raise important issues about the target article (Stoffregen & Bardy 2001). The commentaries also highlight some assumptions, often implicit, that underlie traditional interpretations of perception. We argue that evaluation of the global array and its implications for perception requires both analytical research on specification in the global array and new empirical research on the use of information in the global array for the control of action.

Taking regular walks when living with Parkinson’s disease has beneficial effects on movement and quality of life. Yet, patients usually show reduced physical activity compared to healthy older adults. Using auditory stimulation such as music can facilitate walking but patients vary significantly in their response. An individualized approach adapting musical tempo to patients’ gait cadence, and capitalizing on these individual differences, is likely to provide a rewarding experience, increasing motivation for walk-in PD. We aim to evaluate the observance, safety, tolerance, (...) usability, and enjoyment of a new smartphone application. It was coupled with wearable sensors and delivered individualized musical stimulation for gait auto-rehabilitation at home. Forty-five patients with PD underwent a 1-month, outdoor, uncontrolled gait rehabilitation program, using the BeatWalk application. The music tempo was being aligned in real-time to patients’ gait cadence in a way that could foster an increase up to +10% of their spontaneous cadence. Open-label evaluation was based on BeatWalk use measures, questionnaires, and a six-minute walk test. Patients used the application 78.8% of the prescribed duration and enjoyed it throughout the program. The application was considered “easy to use” by 75% of the patients. Pain, fatigue, and falls did not increase. Fear of falling decreased and quality of life improved. After the program, patients improved their gait parameters in the six-minute walk test without musical stimulation. BeatWalk is an easy to use, safe, and enjoyable musical application for individualized gait rehabilitation in PD. It increases “walk for exercise” duration thanks to high observance.Clinical Trial Registration: ClinicalTrials.gov Identifier: NCT02647242. (shrink)

Emotions are a natural vector for acting together with others and are witnessed in human behaviour, perception and body functions. For this reason, studies of human-to-human interaction, such as multi-person motor synchronisation, are a perfect setting to disentangle the linkage of emotion with socio-motor interaction. And yet, the majority of joint action studies aiming at understanding the impact of emotions on multi-person performance resort to enacted emotions, the ones that are emulated based on the previous experience of such emotions, and (...) almost exclusively focus on dyadic interaction. In addition, tasks chosen to study emotion in joint action are frequently characterised by a reduced number of physical dimensions to gain experimental control and subsequent facilitation in data analysis. Therefore, it is not clear how naturalistically induced emotions diffuse in more ecological interactions with other people and how emotions affect the process of interpersonal synchronisation. Here, we show that positive and negative emotions differently alter spontaneous human synchronous behaviour during a multi-person improvisation task. The study involved 39 participants organised in triads who self-reported liking improvisational activities. The task involved producing improvisational movements with the right hand. Participants were emotionally induced by manipulated social feedback involving a personal ranking score. Three-dimensional spatio-temporal data and cardiac activity were extracted and transformed into oscillatory signals to compute behavioural and physiological synchrony. Our results demonstrate that individuals induced with positive emotions, as opposed to negative emotions or a neutral state, maintained behavioural synchrony with other group members for a longer period of time. These findings contribute to the emerging shift of neuroscience of emotion and affective sciences towards the environment of social significance where emotions appear the most—in interaction with others. Our study showcases a method of quantification of synchrony in an improvisational and interactive task based on a well-established Kuramoto model. (shrink)

A mass problem is a set of functions $\omega \to \omega $. For mass problems ${\mathcal {C}}, {\mathcal {D}}$, one says that ${\mathcal {C}}$ is Muchnik reducible to ${\mathcal {D}}$ if each function in ${\mathcal {C}}$ is computed by a function in ${\mathcal {D}}$. In this paper we study some highness properties of Turing oracles, which we view as mass problems. We compare them with respect to Muchnik reducibility and its uniform strengthening, Medvedev reducibility.For $p \in [0,1]$ let ${\mathcal {D}}$ (...) be the mass problem of infinite bit sequences y such that for each computable bit sequence x, the bit sequence $ x {\,\leftrightarrow\,} y$ has asymptotic lower density at most p = y$ ). We show that all members of this family of mass problems parameterized by a real p with $0 p$ for each computable set x. We prove that the Medvedev complexity of the mass problems ${\mathcal {B}}$ is the same for all $p \in $, by showing that they are Medvedev equivalent to the mass problem of functions bounded by ${2^{2}}^{n}$ that are almost everywhere different from each computable function.Next, together with Joseph Miller, we obtain a proper hierarchy of the mass problems of type $\text {IOE}$ : we show that for any order function g there exists a faster growing order function $h $ such that $\text {IOE}$ is strictly above $\text {IOE}$ in the sense of Muchnik reducibility.We study cardinal characteristics in the sense of set theory that are analogous to the highness properties above. For instance, ${\mathfrak {d}} $ is the least size of a set G of bit sequences such that for each bit sequence x there is a bit sequence y in G so that $\underline \rho >p$. We prove within ZFC all the coincidences of cardinal characteristics that are the analogs of the results above. (shrink)

47. Le « linteau » inscrit du « Dioscourion ». Examen de la thèse de G. Roux selon lequel le linteau inscrit ID 2548 est à restituer à la porte du temple A du sanctuaire GD 123. Cette solution s'accorde mal soit aux données du terrain, soit au texte de l'inscription. Autres restitutions possibles. 48. Les portes du Létôon, le péribole du Dôdékathéon et le prétendu débarquement à Skardhana. Chronologie respective de la construction et de la destruction du péribole du (...) Dôdékathéon, des deux portes du Létôon (on envisage l'hypothèse que celle du Sud ait toujours existé) et des étapes successives de la construction de l'Agora des Italiens. Rejet de l'hypothèse d'un débarquement archaïque à Skardhana. 49. Les propylées et autres accès de l'Agora des Italiens. Rien ne permet de prétendre, comme le font ceux qui veulent y voir un marché aux esclaves, que l'Agora des Italiens n'avait pas les larges accès habituels à ce genre d'édifices. 50. Encore les pressoirs. Présentation d'un pressoir aménagé tardivement dans l'Agora des Italiens et le Létôon. Graffite chrétien associable au pressoir de la Maison de Cléopâtre. 51. Sur Vorigine supposée détienne des bronzes du Pirée. Il est gratuit de supposer avec G. Dontas que les grands bronzes du Pirée proviennent d'un pillage de Délos. (shrink)

In this paper, I will be primarily concerned with moral issues regarding future people and the environment. When it comes to the future, we have deontological and epistemic limitations. The closer to the present, the higher the certainty and the knowledge we have about facts. Thus, when we intend to find moral clarity regarding a future scenario, we deal with an inverse relation between certainty and time. The main problem is that most ways of dealing with moral issues about future (...) scenarios do not address this relation, and rather focus on things that seem to simplify and clarify the uncertainties of the future. In response to this, I propose a different approach, one that operates neutrally and timelessly dealing with the uncertainties of the future while providing moral groundings that can help to clarify the future’s state of moral vagueness. (shrink)

Les recompositions familiales touchent l’ensemble des liens familiaux et des liens intergénérationnels. Or, si l’on observe, tant sur le plan juridique que dans les pratiques des familles conjugales, une acception plus complexe et plus riche de la parentalité, les grands-parents restent souvent méconnus. Comment construisent-ils leurs rapports à leurs « beaux-petits-enfants »? Nous avons examiné la littérature et interrogé des « belles-grands-mères » pour tenter d’y voir plus clair. Quelles représentations le champ social offre-t-il des beaux-grands-parents? Et quelles sont concrètement (...) les conditions et les étapes qui rendent possible une identité « beau-grand-parentale »? (shrink)

Mise en rapport de trois écrivains français qu'apparemment tout sépare mais dont les questions récurrentes - Dieu, le néant, le livre, l'histoire- se retrouvent en chacun d'eux.

Si la philosophie du droit a une très longue histoire, le bouleversement des conditions techniques, économiques, sociales et politiques nous impose aujourd'hui de renouveler en profondeur le traitement des questions qu'elle pose traditionnellement ainsi que les réponses qui y sont données. La définition de la justice, le partage des biens et des charges de la vie en société, les rôles respectifs de l'État, du marché et de la société civile, la mission des juges et l'application des lois, ou encore le (...) contenu et l'importance des droits de l'homme, doivent être réexaminés dans une perspective instruite par l'éclairage historique, mais résolument tournée vers les problèmes du présent et les choix qui engagent l'avenir. C'est dans une telle optique qu'a été conçu cet ouvrage. (shrink)

Theories of knowledge as credit for true belief, or as cognitive achievement, have to face the following objection: in the famous Barn façades case, it seems that the truth of Barney's belief that he is in front of a barn is to be explained by the correct functioning of his cognitive capacities, although we are reluctant to say that he knows he is in front of a barn. Duncan Pritchard concludes from this that a safety clause, irreducible to the conditions (...) a true belief must satisfy in order to be credited to the believer, constitutes a necessary condition of knowledge. Because those who define knowledge as a cognitive achievement have not convincingly answered this objection, I intend, in the first section of this paper, to refute it by showing how practical and doxastic achievements differ. Then I defend the idea that we should also distinguish two kinds of environmental epistemic luck, and, correlatively, two kinds of safety, that are not equally incompatible with knowledge. Finally, I argue that this distinction is inevitably vague and I indicate some consequences of this vagueness for our knowledge‐intuitions. (shrink)

La présente étude rassemble les passages de l’Ab Vrbe condita de Tite-Live où un terme lié au rire est associé à un discours ou à une parole rapportée, afin de les confronter aux vues exprimées par Cicéron et Quintilien sur le rire en contexte rhétorique. Si tous les passages étudiés s’insèrent très bien dans la conception rhétorique du rire, l’historien latin s’appuie sur celle-ci pour offrir une répartition originale entre usages acceptables et formes abusives du rire qui participe à la (...) construction des portraits personnages et de l’œuvre. (shrink)

My main aim in this paper is to contribute to the elucidation of the nature of non-religious faith. I start by summarising several well-known arguments that belief is neither necessary nor sufficient for faith. I then try to identify the nature of the positive cognitive attitude towards p that is involved in having faith that p. After dismissing some candidates for the role, I explore the idea that faith and hope are similar attitudes. On this basis, I then advance a (...) new characterisation of faith. Finally, I turn to the question of the rationality of faith. I argue that faith is intrinsically irrational because it is an intrinsically incoherent propositional attitude, but that there is nonetheless a sense in which faith is neither intrinsically epistemically irrational nor intrinsically practically irrational. (shrink)

My main intention in this article is to settle the question whether having the ability to \ is, as Ryleans think, necessary for knowing how to \, and to determine the kind of role played by procedural knowledge in knowing how to \ and in acquiring and possessing the ability to \. I shall argue, in a seemingly anti-Rylean fashion, that when it comes to know-hows that are ordinarily categorised as physical skills, or—to be, for the moment, philosophically neutral—as enabling (...) one to possess such skills, it is necessary to have procedural knowledge of how to \ in order to possess those know-hows. However, I shall contend that this knowledge cannot be acquired without acquiring the kind of ability to \ in which having the skill to \ consists. And that having acquired the ability to \ is not only necessary but also sufficient for having acquired procedural knowledge of how to succeed in \-ing. (shrink)

The reception of René Girard’s work in France deserves book-length treatment to fully describe the heated debates, conflicting expectations, and controversy that it inspired before its lasting importance was eventually recognized. We must keep in mind that, although he lived in the US and became a citizen in 1956, he always kept his sights on his native land. He watched the transformations of French thought from the other side of the ocean; he forged his own writing strategies in response to (...) French thought; and it was within the context of French debates that he chose to formulate, through the conjoined hypotheses concerning mimetic desire, the scapegoat, and Judeo-Christian writing, the founding event of his... (shrink)

We are naturally inclined to judge that it is better to know that p than to merely truly believe that p. How to account for this intuition? In this paper, I examine Williamson, Goldman and Olsson, and Pritchard's answers, and agree with Pritchard that it cannot be consistently claimed that knowledge is epistemically superior to mere true belief, and that truth is the only finally valuable epistemic good. Contrary to Pritchard, I argue that the latter claim is deeply mistaken. I (...) do so by showing that mere true beliefs have no epistemic value at all. I sketch the consequences of this point concerning the epistemic value of knowledge, and answer some objections to the thesis that mere true beliefs do not possess epistemic value. (shrink)

When one tries to determine what the iconic dimension of thought consists in for Peirce and what its range is, one might have the impression that his remarks on this matter are inconsistent. For instance, on the one hand he writes the following: Remember it is by icons only that we really reason, and abstract statements are valueless in reasoning except so far as they aid us to construct diagrams. The sectaries of the opinion I am combating seem, on the (...) contrary, to suppose that reasoning is performed with abstract "judgments," and that an icon is of use only as enabling me to frame abstract statements as premisses. In an apparently similar fashion, Peirce argues that the predicate of a... (shrink)

Benoit Delbecq reflects upon the conditions under which his creative activity, as a pianist, a composer and an improviser, has to take place within the French context. Status of the copyrights, contribution of public funding, new modes of distribution, ambiguous irruptions of the show business mega-machine, fictions of freedom generated within the creative moment, polymorphous collective structures: this concrete work of knitting a new autonomous artistic network sheds light, beyond the microcosm of jazz, on the production of sociality in (...) today’s France. (shrink)

Charles S. Peirce holds some views about science and inquiry whose exact significance and ratio essendi are notoriously hard to grasp. One of these is particularly intriguing, namely, his frequently inferring from the intuitive ideas that science consists “in diligent inquiry into truth for truth’s sake”, and that the greatest threat to science is to “block the way of inquiry”, the conclusions that “belief […] has no place in science” and that the “scientific man”, when inquiring, has only “provisional” opinions. (...) In this article, I examine the ground and validity of the infamous and, arguably, strongly counterintuitive thesis that “belief has... (shrink)

This article argues for the need to recover the concept of political myth in order to understand the crucial phenomena of our epoch. By drawing on Blumenberg’s philosophical reflections on myth, it proposes to understand political myth as the continual process of work on a common narrative by which the members of a social group can provide significance to their political conditions and experience. In order to show how this understanding of political myth can throw light on important aspects of (...) contemporary politics, the article analyses the work on one of the most conspicuous political myths of our time: the clash of civilizations. By reconstructing the mechanisms through which this myth works, the article shows how a paradigm that has been strongly criticized as too simplistic and scientifically inadequate could have turned into a successful political myth, i.e. into a self-fulfilling prophecy. (shrink)

Considérée comme le seul pays « émergent » de son continent, l' Afrique du Sud est le produit d'une histoire tourmentée, sortie du système de l'apartheid pour devenir un État démocratique et multiracial au début des années 1990. Si la constitution prône une diversité culturelle et linguistique, reflet de sa population, l'Afrique du Sud s'intéresse plus à l'institution de la Francophonie, pour les avantages que son commerce et sa diplomatie en Afrique francophone peuvent en tirer, que pour l'usage de la (...) langue française surtout pratiquée par une communauté africaine francophone récemment implantée.South Africa is considered as the sole emerging country on its continent and has undergone a very difficult history. Following the end of the apartheid system, South Africa was transformed into a multiracial and democratic state in the nineties. The South African constitution now endorses linguistic and cultural diversity which mirrors its population. Francophony as an institution is of major interest for South Africa more to support its proactive trade and diplomacy in the Francophone area than to help develop the French language which is mainly spoken by a recently settled Francophone African community. (shrink)

For this special issue dedicated to Jonathan Glover, Peter Singer was asked to reflect on the influence that the book Causing Death and Saving Lives had on him, as well as the Glover seminar in Oxford that Peter Singer attended in the late 1960s. One of Peter Singer's recurring arguments is the criticism of the traditional distinction between acts and omissions. But Glover is no stranger to this questioning, even if the two thinkers do not seem to want to draw (...) exactly the same conclusions. What is at stake is this: what are we really responsible for and how demanding should our morality be? (shrink)

La médiation familiale existe en France depuis un peu moins de vingt ans et elle a obtenu, en 2002, une reconnaissance officielle sous la forme de la création d’un diplôme décerné par l’État. Cet article analyse le succès de la médiation et la place qu’elle occupe aujourd’hui dans la régulation des affaires privées. Pour ce faire, il considère différents niveaux de changement: l’évolution de la famille, celle de l’intervention sociale, ainsi que les stratégies développées par les médiateurs. En ce qui (...) concerne la famille et les ruptures d’union, la médiation familiale s’inscrit dans le droit fil des conceptions qui dominent actuellement. Elle se fait le promoteur de séparations négociées, permettant le maintien des relations entre l’enfant et le parent avec lequel il ne vit pas. S’agissant des transformations de l’action sociale, la médiation apparaît également comme l’expression d’un mouvement plus large : la diffusion d’une forme « douce » d’encadrement des comportements privés. En médiation, les parties sont conduites à écouter l’autre et à faire des concessions. Le dispositif lui-même est porteur d’une normativité forte. Le succès de la médiation ne s’explique cependant que si l’on prend en considération le troisième niveau, l’action des médiateurs : renforcement de la formation, obtention de soutiens sans faille dans la société civile et l’État, et détermination dans la volonté de créer une profession. L’auteur s’interroge sur les raisons qui sont à la base de cette détermination et évoque les questions qui se posent aujourd’hui aux médiateurs. (shrink)

La réception de la théologie politique de Johann Baptist Metz est un fait d’interprétation. Cette contribution présente tout d’abord la périodisation, apparue dans les années 1980, de l’oeuvre de Metz en trois phases: la période de la théologie transcendantale; la première phase de la théologie politique ainsi que sa deuxième phase. Décrire deux phases de la théologie politique délimitées par la formulation de la thèse centrale de l’oeuvre de Metz, selon laquelle la foi est mémoire de la souffrance de l’humanité, (...) permet de mettre en lumière la signification et les enjeux de la théologie politique. La deuxième partie de l’article s’intéresse à un aspect encore sujet à discussions de la réception de l’oeuvre de Metz: en réponse au refus postmoderne des grands récits, Metz et ses disciples présentent la théologie politique comme une théologie négative. Cependant, une telle réponse peut-elle être séparée d’autres affirmations déterminantes pour la théologie politique, en particulier celle selon laquelle le temps a une fin? (shrink)