Les bases neurales de la perception du temps et de la régulation temporelle de l'action

Adaptation to environment requires that temporal characteristics of events and actions are taken into account. The neural bases of temporal encoding and memory mechanisms raise core questions. Interesting information is provided by the recording of slow brain potential changes, thanks to the excellent temporal resolution of this method. The recording of metabolic activity changes enables identification of several cortical and subcortical structures which subtend temporal mechanisms. Current data enlighten the involvement of the basal ganglia and the frontal cortex (in particular the supplementary motor area) in time processing.     

La genese de l'Idee de hasard et la resistance du reel aux operations

Conclusions L'étude des faits, dont nous n'avons pu donner que quelques échantillons, ne laisse pas de doute sur la découverte tardive de la notion de hasard et la formation progressive du raisonnement probabiliste. On aurait pu s'attendre à trouver une intuition de la probabilité: la realité quotidienne offre le spectacle d'un mélange inextricable de faits et de séquences causales. Ce n'est qu'en théorie ou encore dans une certaine mesure en laboratoire que les faits et relations causales sont simplifiés et dissociés au point de nous permettre des déductions certaines. Dans la vie courante on est plus souvent réduit à deviner et à baser ses prévisions sur des fréquences empiriques que sur des lois et équations simples et rigoureuses. Et pourtant l'expérimentation psychologique prouve que l'attitude probabiliste, quoique suggérée et entretenue par les faits, n'est pas primitive; bien au contraire, elle ne se construit qu'à partir d'un certain niveau de raisonnement et en interdépendance étroite avec celui-ci. La notion de hasard est étrangère à toute mentalité primitive, aussi bien celle du jeune enfant que celle dite du primitif et de l'obsédé en état de régression pathologique, qui chargent volontiers les événements fortuits de significations subjectives et miraculeuses. La notion de hasard et le raisonnement probabiliste en général ne sont accessibles qu'à une mentalité objective et rationnelle, capable de discerner, grâce à des mécanismes opératoires, le domaine du déductible de celui du fortuit et à structurer ce dernier par la méthode combinatoire en un système de probabilités, dont la méthode génétique permet d'analyser le processus et l'évolution.     

Un modèle neurobiologique de la perception et de l'estimation du temps

Frontal-striatal circuits provide an important neurobiological substrate for timing and time perception as well as for working memory. In this review, we outline recent theoretical and empirical work to suggest that interval timing and working memory rely not only on the same anatomic structures, but also on the same neural representation of a specific stimulus. In the striatal beat-frequency model, cortical neurons fire in an oscillatory fashion to form representations of stimuli, and striatal medium spiny neurons detect those patterns of cortical firing that occur co-incident to important temporal events. Information about stimulus identity can be extracted from the specific cortical networks that are involved in the representation, and information about duration can be extracted from the relative phase of neural firing. The properties derived from these neurobiological models fit well with the psychophysics of timing and time perception as well as with information-processing models that emphasize the importance of temporal coding in a variety of working-memory phenomena.     

Histoire et tendances de la psychologie critique en Amérique du Nord

Critical psychology in the United States and Canada identifies psychology as inherently a political enterprise. It has developed along three overlapping but distinct lines that diverge in history, focus, and purpose: (a) building on psychology's empirical research methods, employing them to help reduce injustice and advance progressive or radical social change; (b) rejecting mainstream psychology's positivist and individualistic theoretical and empirical underpinnings and developing emancipatory theory and practices in their place; and (c) challenging psychology's institutional power over individuals, especially mentally and emotionally troubled individuals whose behavior strikes others as problematic. This article first describes each approach's history, influences, and roles in academic scholarship and institutions and in professional and nonacademic organizations. It then details recent efforts to expand and institutionalize a critical psychology presence despite mainstream North American psychology's strong resistance, while noting the central intertwining of personal networks, political leanings, and psychological theory. Finally, it briefly considers the implications and consequences of the lack of consensus about what critical psychology is and should become.     

Vieillissement et Démence de Type Alzheimer: influence du type de connecteur sur la compréhension et la mémorisation de phrases

The goal of this study is to examine the impact of various connectives such as causal, adversative, additive on sentence comprehension and memory for young, elderly and for subjects suffering from Alzheimer's disease (AD). The three groups (N = 48) read pairs of clauses linked or not by a connective at their own rhythm and they performed different tests: verb recognition, comprehension and inferential questions and completion. Results show that whatever the type of connective, its presence has few effects on young and elderly performances. We note an increase of connectives reading times for AD subjects, suggesting that the presence of connectives seems to be a cue for interclausal integration. Moreover, the treatment of the adversative is more difficult for them than the treatment of causal and additive.     

Essai sur la logique de l'indeterminisme et la ramification de l'espace-temps

Sans résumé     

Lois de la Nature et Constructions de l'Esprit

Sans résumé     

Communication engageante et représentations sociales : une application en faveur de la protection de l’environnement et du recyclage

The aim of this study is to compare the effectiveness of several communication strategies, by articulating the binding communication paradigm and the social representation theory, in order to encourage young sportsmen to act for environmental protection. A pilot study made it possible to identify central and peripheral elements of the social representation of environmental protection. An experiment was conducted and the results conform to our expectations. On one hand, the participants in the binding communication situation express attitudes and behavioral intentions more favorable towards recycling and environmental protection than those who only read the persuasive message. On the other hand, the activation of central elements involves more important changes in attitudes and behavioral intentions than the activation of peripheral elements.     

Développement de la mémoire de travail : relations du centre exécutif avec la boucle phonologique et le calepin visuospatial chez des enfants de CE1 et de CM2

The aim of this study was to examine the development of working memory's components and their relationships. Phonological loop's, visuospatial sketchpad's and central executive's efficiencies were assessed by simple and complex span tasks and executive tasks with verbal and visuospatial material. The analyses were performed on 64 second-grade and 55 fifth-grade children's data. Developmental performances improvement was examined according to tasks and material. Analyses of variance revealed performances improvement according to age and type of material (verbal > non verbal) for the slave system tasks and for a part of central executive's tasks. Correlation analysis and exploratory factorial analysis suggested that slave systems would become progressively more specific and that central executive's efficiency would be dependent on this specialization.     

Impact du type de buts et du sentiment d'auto-efficaciaté sur l'autorégulation et la performance dans une tâche cognitive

The aim of this study was to examine two hypotheses derived from theoretical models of the role of learning and performance goals in cognitive functioning. The first predicts that being highly focused on performance goals leads students to develop lower levels of self-efficacy than those who are less focused on performance. The second hypothesis predicts that the combination of high performance goals and low self-efficacy will have a negative impact on students' self-regulation and performance in a new task. After having filled out a questionnaire assessing their goals, 128 female students were met individually and asked to solve a verbal concept formation task. Self-efficacy was assessed prior to the resolution of the task during which self-regulation and performance were observed. Contrary to the first hypothesis, students having high performance goals were found to have higher self-efficacy than those having low goals. In addition, no interaction between self-efficacy and performance goals was found on self-regulation and performance on the task. The results showed that whatever students' goals, self-efficacy is a powerful determinant of self-regulation and performance. The discussion emphasizes the role of self-efficacy and the value of a motivational profile combining high concern for both performance and learning goals in cognitive functioning.