According to one productive and influential approach to cognition, categorization, object recognition, and higher level cognitive processes operate on a set of fixed features, which are the output of lower level perceptual processes. In many situations, however, it is the higher level cognitive process being executed that influences the lower level features that are created. Rather than viewing the repertoire of features as being fixed by low-level processes, we present a theory in which people create features to subserve the representation (...) and categorization of objects. Two types of category learning should be distinguished. Fixed space category learning occurs when new categorizations are representable with the available feature set. Flexible space category learning occurs when new categorizations cannot be represented with the features available. Whether fixed or flexible, learning depends on the featural contrasts and similarities between the new category to be represented and the individual's existing concepts. Fixed feature approaches face one of two problems with tasks that call for new features: If the fixed features are fairly high level and directly useful for categorization, then they will not be flexible enough to represent all objects that might be relevant for a new task. If the fixed features are small, subsymbolic fragments (such as pixels), then regularities at the level of the functional features required to accomplish categorizations will not be captured by these primitives. We present evidence of flexible perceptual changes arising from category learning and theoretical arguments for the importance of this flexibility. We describe conditions that promote feature creation and argue against interpreting them in terms of fixed features. Finally, we discuss the implications of functional features for object categorization, conceptual development, chunking, constructive induction, and formal models of dimensionality reduction. Key Words: concept learning; conceptual development; features; perceptual learning; stimulus encoding. (shrink)

Pierre Maquet1,2,6, Steven Laureys1,2, Philippe Peigneux1,2,3, Sonia Fuchs1, Christophe Petiau1, Christophe Phillips1,6, Joel Aerts1, Guy Del Fiore1, Christian Degueldre1, Thierry Meulemans3, André Luxen1, Georges Franck1,2, Martial Van Der Linden3, Carlyle Smith4 and Axel Cleeremans5.

Economic Geography is the most complete, up-to-date textbook available on the important new field of spatial economics. This book fills a gap by providing advanced undergraduate and graduate students with the latest research and methodologies in an accessible and comprehensive way. It is an indispensable reference for researchers in economic geography, regional and urban economics, international trade, and applied econometrics, and can serve as a resource for economists in government. Economic Geography presents advances in economic theory that explain why, despite (...) the increasing mobility of commodities, ideas, and people, the diffusion of economic activity is very unequal and remains agglomerated in a limited number of spatial entities. The book complements theoretical analysis with detailed discussions of the empirics of the economics of agglomeration, offering a mix of theoretical and empirical research that gives a unique perspective on spatial disparities. It reveals how location continues to matter for trade and economic development, yet how economic integration is transforming the global economy into an economic space in which activities are performed within large metropolitan areas exchanging goods, skills, and information. Economic Geography examines the future implications of this evolution in the spatial economy and relates them to other major social and economic trends.Provides a complete introduction to economic geography Explains the latest theory and methodologies Covers the empirics of agglomeration, from spatial concentration measurement to structural estimations of economic geography models Includes history and background of the field Serves as a textbook for students and a resource for professionals. (shrink)

Conscious awareness comprises two distinct states, autonoetic and noetic awareness. Schizophrenia impairs autonoetic, but not noetic, awareness. We investigated the strategic regulation of relevant and irrelevant contents of conscious awareness in schizophrenia using a directed forgetting paradigm. Twenty-one patients with schizophrenia and 21 normal controls were presented with words and told to learn some of them and forget others. In a subsequent test, they were asked to recognize all the words they had seen previously and give remember, know or guess (...) responses according to whether they recognized words on the basis of autonoetic awareness, noetic awareness, or guessing. Overall, patients showed the same degree of a directed forgetting effect as normal subjects. However, whereas the effect was observed both for remember and know responses in normal subjects, it was observed for know, but not for remember, responses in patients. These results indicate that patients with schizophrenia exhibit an impaired strategic regulation of contents of autonetic awareness for relevant and irrelevant information. (shrink)

Jean-Luc Nancy discusses his life's work with Pierre-Philippe Jandin. As Nancy looks back on his philosophical texts, he thinks anew about democracy, community, jouissance, love, Christianity, and the arts.

La notion de « cause secrète », à laquelle les classiques ont largement eu recours, est liée à une pratique de la science et à une conception de ses méthodes telles que la « loi » se trouve au coeur du dispositif. Si certains phénomènes paraissent ne pas être régis par la loi, il faut alors se mettre à amender la loi par de « petites équations ». Si le calcul des probabilités entre en scène, c'est pour déceler précisément la (...) présence de causes qui, d'abord secrètes, le seront moins par la suite, et seront, de toute façon, conformes aux lois. (shrink)

The objective of this article is to contribute to the epistemological, theoretical, methodological, and pedagogical debates concerning the relationship between research activities, training activities, and work activities. Its main focus is on new forms of engineering, thought of as cooperative and transformative. After situating the issues of the reciprocal triadic relationships between the three poles, the article presents two practical cases of transformative cooperative engineering. The authors then return to their epistemological position, which is socio-constructivist, complex, interactionist, and critical. They (...) sketch out the first elements of an elaborate system of intelligibility (multi-referential and transdisciplinary) aimed at supporting the hypothesis of an engineering process of joint transformation (trades, actors, organizations, training provision). The article also presents the research methodology (training-action-research) developed. A discussion of the issues and conditions of possibility of cooperative and transformative engineering concludes the article. (shrink)

Deux inscriptions découvertes à une centaine de mètres de la Synagogue font connaître des oί εν Δήλω Ίσραηλΐται οί άπαρχόμενοι είς ιερόν άγιον Άργαριζείν. Il s'agit de Samaritains comme l'indiquent la déclaration d'appartenance au Garizim et le nom d'Israëlites. Ces inscriptions ont la double utilité de révéler une nouvelle communauté étrangère à Délos et d'enrichir le dossier, encore très maigre, de la diaspora samaritaine. La date des inscriptions, fondée sur la seule paléographie, reste imprécise : la plus ancienne doit remonter (...) à la première moitié du IIe siècle ; la plus récente peut être postérieure à la destruction Temple du Garizim en 129 av. J.-C. Les « Israélites de Délos » possédaient leur local propre à 100 m au Nord de la Synagogue, nouveau qui invite à reconsidérer l'implantation hébraïque à Délos. (shrink)

Cette introduction précise le lieu qui a vu se mettre en place les textes qui composent le dossier, les présente et dégage leurs axes principaux respectifs. Dans un second temps, plus décalé, elle ouvre trois interrogations critiques, articulées à ce que propose Joas et visant à poursuivre la discussion sur ce qui est en jeu aux plans social, politique, religieux. Elle salue la visée d’une « autoréflexion des sciences sociales et culturelles sur leurs bases biologiques et leurs contenus normatifs » (...) en lien avec des problèmes sociaux et politiques historiquement déterminés. Elle souligne le substrat anthropologique travaillé par l’approche joassienne, celle-ci visant à mettre en évidence ce qui se joue entre les corps, individuels et sociaux, les créativités de l’agir humain, singulières, et les structures et dynamiques sociales. C’est sous cet horizon que se profilent les trois questions marquant décalage avec le travail de Joas. La première le fait en focalisant sur les jeux entre corps et dépassement, et ce qui y est mobilisé, où se creuse de l’organisation collective non réductible au seul politique et ses nouages propres. La deuxième revient sur la question du rite, pour en évoquer l’importance au cœur de nos activités mondaines, sur mode séculier et non religieux. La troisième reprend la question proprement religieuse, interrogeant ce que Joas fait de la différenciation moderne des sphères sociales, ainsi que l’absence, chez lui, de travail critique sur les religions en leurs traditions, avec ce qui peut les traverser de pathologies propres. (shrink)

Professor of History and Philosophy of Science at the University of Paris 1–Panthéon-Sorbonne since 2000, former director of the Institute of History and Philosophy of Science and Technology (IHPST) of the CNRS, Jean Gayon (1949–2018) died on April 28th 2018 following a long illness that he faced with determination and courage.

“African thinking,” “African thought,” and “African philosophy.” These phrases are often used indiscriminately to refer to intellectual activities in and/or about Africa. This large field, which sits at the crossroads between analytic philosophy, continental thought, political philosophy and even linguistics is apparently limitless in its ability to submit the object “Africa” to a multiplicity of disciplinary approaches. This absence of limits has far-reaching historical origins. Indeed it needs to be understood as a legacy of the period leading to African independence (...) and to the context in which African philosophy emerged not so much as a discipline as a point of departure to think colonial strictures and the constraints of colonial modes of thinking. That the first exponents of African philosophy were Westerners speaks volumes. Placide Tempels but also some of his predecessors such as Paul Radin and Vernon Brelsford were the first scholars to envisage this extension of philosophy into the realm of the African “primitive.” The material explored in this article – Statues Also Die, Bantu Philosophy, The Cultural Unity of Negro Africa, and It For Others - resonates with this initial gesture but also with the ambition on part of African philosophers such as VY Mudimbe to challenge the limits of a discipline shaped by late colonialism and then subsequently recaptured by ethnophilosophers. Statues Also Die is thus used here as a text to appraise the limitations of African philosophy at an early stage. The term “stage,” however, is purely arbitrary and the work of African philosophers has since the 1950s often been absorbed by an effort to retrieve African philosophizing practices before, or away from, the colonial matrix. This activity has gained momentum and has been characterized by an ambition to excavate and identify figures and traditions that had hitherto remained unacknowledged: from Ptah-hotep in ancient Egypt and North-African Church fathers such as Saint Augustine, Tertullian and Arnobius of Sicca, to “falsafa”-practising Islamic thinkers, from the Ethiopian tradition of Zera Yacob and Walda Heywat, to Anton-Wilhelm Arno, the Germany-trained but Ghana-born Enlightenment philosopher. (shrink)

The origin of features from nonfeatural information is a problem that should concern all theories of object categorization and recognition, not just the flexible feature approach. In contrast to the idea that new features must originate from combinations of simpler fixed features, we argue that holistic features can be created from a direct imprinting on the visual medium. Furthermore, featural descriptions can emerge from processes that by themselves do not operate on feature detectors. Once acquired, features can be decomposed into (...) component features if required by other categorizations. We therefore argue that it is not necessary to separate holistic and componential approaches to representations, because the latter is a development of the former. The requirements for representational flexibility outstrip the performance of any existing computational models, but specific mechanisms of feature creation are discussed and evaluated. Challenges for feature creation mechanisms are discussed together with the constraints (perceptual, statistical, functional, and task) they will need to satisfy. (shrink)

A formalism is introduced to represent the connective organization of an evolving neuronal network and the effects of environment on this organization by stabilization or degeneration of labile synapses associated with functioning. Learning, or the acquisition of an associative property, is related to a characteristic variability of the connective organization: the interaction of the environment with the genetic program is printed as a particular pattern of such organization through neuronal functioning. An application of the theory to the development of the (...) neuromuscular junction is proposed and the basic selective aspect of learning emphasized. (shrink)

Cet entretien croisé propose un échange avec Pierre Lalart, président de la Fédération française de espaces de rencontre, et Phil Coleman, chargé de communication pour les centres de contact au Royaume-Uni. Il repose sur un rapport établi par les deux pays concernant les points de divergence et de convergence entre eux. L’interview comprend trois domaines d’investigation : le premier porte sur l’histoire et le fonctionnement de chaque structure, le deuxième précise l’évolution des pratiques cliniques et sociales en leur sein, (...) le troisième apporte un éclairage sur les enseignements tirés de ce regard croisé. (shrink)

Parties, Trade-unions, SocialMovements : Relations and Articulations How are we to explain the resurgence of the question of political parties, when the question of socialmovements seemed to have eclipsed it ? What is the role to be played by parties, trade-unions andby social movements in a project of radical social transformation ? What are the modes of alliance,of collaboration and convergence, to be constructed between them ? These are some of the questionsaddressed in the present article.

L’article 1266-1 du projet de réforme du droit de la responsabilité civile présenté par la Chancellerie le 13 mars 2017 s’emploie à enrichir les « effets » de la responsabilité extracontractuelle d’une fonction répressive. Celle-ci se traduit par l’instauration d’une amende civile sanctionnant les fautes dites lucratives, affectée à un fonds public et non assurable. Cette proposition mérite assurément le débat, la nature juridique de cette amende l’inscrivant dans la matière pénale sans que le régime prévu par l’article 1266-1 tire (...) toutes les conséquences de cette inscription. L’efficacité de cette nouvelle sanction prête également à discussion, tant du point de vue du débiteur que du créancier de l’amende civile. (shrink)