Devenir chrétien, est-il un gain ou une perte par rapport aux croyances traditionnelles du Muntu? Est-ce un choix raisonnable pour le Muntu ou une fuite du poids de la tradition? L'auteur part d'une étude anthropologique du peuple bantu à qui il souhaite proposer un horizon sotériologique, loin de toute aliénation ancestrale. Il présente le Muntu comme celui qui reçoit sa parole des ancêtres. Il n'est que le garant de la parole.

This introductory chapter attempts to clarify the philosophical, empirical, and theoretical bases on which a cognitive neuroscience approach to consciousness can be founded. We isolate three major empirical observations that any theory of consciousness should incorporate, namely (1) a considerable amount of processing is possible without consciousness, (2) attention is a prerequisite of consciousness, and (3) consciousness is required for some specific cognitive tasks, including those that require durable information maintenance, novel combinations of operations, or the spontaneous generation of intentional (...) behavior. We then propose a theoretical framework that synthesizes those facts: the hypothesis of a global neuronal workspace. This framework postulates that, at any given time, many modular cerebral networks are active in parallel and process information in an unconscious manner. An information becomes conscious, however, if the neural population that represents it is mobilized by top-down attentional amplification into a brain-scale state of coherent activity that involves many neurons distributed throughout the brain. The long-distance connectivity of these `workspace neurons' can, when they are active for a minimal duration, make the information available to a variety of processes including perceptual categorization, long-term memorization, evaluation, and intentional action. We postulate that this global availability of information through the workspace is what we subjectively experience as a conscious state. A complete theory of consciousness should explain why some cognitive and cerebral representations can be permanently or temporarily inaccessible to consciousness, what is the range of possible conscious contents, how they map onto specific cerebral circuits, and whether a generic neuronal mechanism underlies all of them. We confront the workspace model with those issues and identify novel experimental predictions. Neurophysiological, anatomical, and brain-imaging data strongly argue for a major role of prefrontal cortex, anterior cingulate, and the areas that connect to them, in creating the postulated brain-scale workspace. (shrink)

Amidst the many brain events evoked by a visual stimulus, which are specifically associated with conscious perception, and which merely reflect non-conscious processing? Several recent neuroimaging studies have contrasted conscious and non-conscious visual processing, but their results appear inconsistent. Some support a correlation of conscious perception with early occipital events, others with late parieto-frontal activity. Here we attempt to make sense of those dissenting results. On the basis of a minimal neuro-computational model, the global neuronal workspace hypothesis, we propose a (...) taxonomy which distinguishes between vigilance and access to conscious report, as well as between subliminal, preconscious and conscious processing. We suggest that these distinctions map onto different neural mechanisms, and that conscious perception is systematically associated with a sudden surge of parieto-frontal activity causing top-down amplification. (shrink)

‘Number sense’ is a short‐hand for our ability to quickly understand, approximate, and manipulate numerical quantities. My hypothesis is that number sense rests on cerebral circuits that have evolved specifically for the purpose of representing basic arithmetic knowledge. Four lines of evidence suggesting that number sense constitutes a domain‐specific, biologically‐determined ability are reviewed: the presence of evolutionary precursors of arithmetic in animals; the early emergence of arithmetic competence in infants independently of other abilities, including language; the existence of a homology (...) between the animal, infant, and human adult abilities for number processing; and the existence of a dedicated cerebral substrate. In adults of all cultures, lesions to the inferior parietal region can specifically impair number sense while leaving the knowledge of other cognitive domains intact. Furthermore, this region is demonstrably activated during number processing. I postulate that higher–level cultural devel‐opments in arithmetic emerge through the establishment of linkages between this core analogical representation and other verbal and visual representations of number notations. The neural and cognitive organization of those representations can explain why some mathematical concepts are intuitive, while others are so difficult to grasp. Thus, the ultimate foundations of mathematics rests on core representations that have been internalized in our brains through evolution. (shrink)

A breathtaking look at the new science that can track consciousness deep in the brain How does our brain generate a conscious thought? And why does so much of our knowledge remain unconscious? Thanks to clever psychological and brain-imaging experiments, scientists are closer to cracking this mystery than ever before. In this lively book, Stanislas Dehaene describes the pioneering work his lab and the labs of other cognitive neuroscientists worldwide have accomplished in defining, testing, and explaining the brain events (...) behind a conscious state. We can now pin down the neurons that fire when a person reports becoming aware of a piece of information and understand the crucial role unconscious computations play in how we make decisions. The emerging theory enables a test of consciousness in animals, babies, and those with severe brain injuries. A joyous exploration of the mind and its thrilling complexities, Consciousness and the Brain will excite anyone interested in cutting-edge science and technology and the vast philosophical, personal, and ethical implications of finally quantifying consciousness. (shrink)

Does geometry constitues a core set of intuitions present in all humans, regarless of their language or schooling ? We used two non verbal tests to probe the conceptual primitives of geometry in the Munduruku, an isolated Amazonian indigene group. Our results provide evidence for geometrical intuitions in the absence of schooling, experience with graphic symbols or maps, or a rich language of geometrical terms.

L'ouvrage de Jean Piaget: Sagesse et illusions de laphilosophie n'a point fini de faire parler de lui et de donner à penser. La pierre que le maître genevois a lancée dans le lac des Cygnes, a provoqué un ébranlement salutaire qui remet en question, non seulement un mode contemporain de philosophic mais la philosophic elle même. Substance et modes sont à nouveau soumis à cette interrogation salutaire qui, périodiquement, confronte la philosophie au problème crucial de sa propre possibilityé. À ce (...) titre, même s'il dût être le seul, ce petit livre mériterait la reconnaissance des intéressés. (shrink)

There are two opposing views concerning intuitive cases of wage exploitation. The first denies that they are cases of exploitation at all. It is based on the nonworseness claim: there is nothing wrong with a discretionary mutually beneficial employment relationship. The second is the reasonable view: some employment relationships can be exploitative even if employers have no duty towards their employees. This article argues that the reasonable view does not completely defeat defences of wage exploitation, because these do not rely (...) solely on the nonworseness claim. They also rely on the idea, popularised by Alan Wertheimer, that exploitation is a form of disequilibrium price occurring in defective markets. The article then proceeds to criticise Wertheimer’s account through neoclassical, new institutional, and Austrian economics. It concludes that considerations for economic efficiency are irrelevant to assessing intuitions regarding exploitation. (shrink)

Sean Irving’s book Hayek’s Market Republicanism: The Limits of Liberty shows that the commonly accepted reading of Hayek as a liberal thinker is mistaken, and that his political writings are best understood as belonging to the broader tradition of republicanism. The distinction is important for understanding many aspects of Hayek’s thought, and especially his rejection of social justice and majoritarian democracy. In that sense, one of the book’s more general merits is its implicit contribution to ongoing debates between republican ‘freedom (...) as non-domination’ and liberal ‘freedom as non-interference’. Irving focuses on what he sees as a contradiction between Hayek’s chief concerns about the state as the main source of domination and his disregard for private forms of power, and especially within the capitalist firm. I argue, however, that the example of Hayek should lead us to consider a more prosaic conclusion: freedom as non-domination is a concept less useful for criticising the free market than Irving and left-leaning Republicans seem to assume. (shrink)

This paper clarifies the usage of Albert Hirschman’s categories of market behaviour as of exit and voice in debates about workplace democracy by taking seriously his critique of the neoclassical analysis of competition. Pro-market liberals are generally hostile to the idea of workplace democracy and tend to favour top-down hierarchies as a way of organising labour. This hostility is generally inspired by the neoclassical analysis of exploitation and efficiency, which leads them to defend distributions achieved through exit-based competitive equilibria. Following (...) Hirschman, I propose to consider a hypothetical alternative: a democratic equilibrium, reached through the use of voice. I show that it would present the same appealing characteristics than its competitive counterpart while also accounting for the non-ideal conditions in which markets operate. Support for free markets should entail support for workplace democracy minimally understood as a strengthening of voice. (shrink)

The following resources related to this article are available online at www.sciencemag.org (this information is current as of August 31, 2009 ).

Le monde moderne de par son mode de vie a reçu l'empreinte de l'hygiène et de la médecine ainsi que des principes résultant des découvertes de l'industrie pharmaceutique chimique, de Pasteur, de Flemming, etc. Ces produits sont certes d'un apport utile pour garantir le confort anatomique et physiologique de l'organisme humain, mais il faut raisonnablement les considérer aujourd'hui comme un triomphe d'une humanité à l'incessante poursuite d'une santé durable. La physiologie et l'anatomie n'étant pas les seules composantes de l'être humain, (...) la santé ne saurait en aucun cas être considérée, prise en charge ou ajustée, comme une simple machine industrielle ou être comparée à un plan d'ajustement structurel ou de relance économique pour assurer la croissance et la survie d'un peuple. C'est la colonne vertébrale de la thèse de l'auteur Gervais Mvogo dans son ouvrage Limites et échecs de la médecine occidentale. Théorie de la guérison. Le sujet de réflexion fascine dans son ancrage de parallélisme des sources ontologiques de la nature humaine, s'appuyant ainsi sur Dieu. Le titre ouvre le débat sur la démarche, la pratique, l'émergence et la radiance des firmes et des intelligences artificielles de l'industrie pharmaceutique, véritable politique de la médecine occidentale. (shrink)

A prominent defence of compulsory voting is based on the negative effects of a low turnout on democracy, which leads to an unequal representation of the most vulnerable citizens of our societies, since they are the least likely to vote voluntarily. This paper shows that this justification relies on the truth of an added premise – that voting is a proxy for use of political influence and power. However, the inclusion of this premise weakens the entire argument, which regains consistency (...) only through the adoption of a narrow understanding of what representation is. Introduction. (shrink)

The most influential justification of individual property rights is the Propertarian Argument. It is the idea that the institution of private property renders everyone better off, and crucially, even the worst-off members of society. A recent critique of the Argument is that it relies on an anthropologically false hypothesis – the idea, following Thomas Hobbes, that life in the state of nature is one of widespread scarcity and violence to which property rights are a solution. The present article seeks to (...) reformulate this Anthropological Objection in a way that more directly addresses Hobbes’ original argument. It then shows that private property is justified to the extent that it allows anyone to reclaim their free time. (shrink)

A uniquely integrative work, this volume provides a much needed compilation of primary source material to researchers from basic neuroscience, psychology, developmental science, neuroimaging, neuropsychology and theoretical biology. * The ...