Modeling referential actions in 6- to 18-month-old infants: a precursor to symbolic understanding

Social precursors to symbolic understanding of pictures were examined with 100 infants ages 6, 9, 12, 15, and 18 months. Adults demonstrated 1 of 2 stances toward pictures and objects (contemplative or manipulative), and then gave items to infants for exploration. For pictures, older infants (12, 15, and 18 months) emulated the adult's actions following both types of demonstration trials. For objects, infants did not emulate actions following either stance at any age. The findings suggest that infants enlist their imitative learning skills in the context of learning the conventions of action on pictorial symbols. The data are interpreted as pointing to the importance of social learning in developing an understanding of the referential function of pictorial symbols.     

Seeing beyond the local context: the understandings of slavery and the slave trade of students in Reunion Island schools

In the new millennium model of low definition curriculum, teachers have professional latitude to deliver prescribed disciplinary content through a range of pedagogical and assessment orientations. The rhetoric is that with carefully crafted practice, the goal of high quality/high equity learning outcomes can be achieved for all students. This paper is focused on the experiences of teachers and students from one large multicultural, multilingual, low socio-economic status community from Reunion Island, a remote French department in the Indian Ocean. In their history and geography lessons, the topic of study is a contentious one and closely connected to the students’ personal histories, that of slavery in the eighteenth and nineteenth centuries. Using an analytical lens that combines the sociological work of Bernstein and Maton, and utilises ranking questionnaires, this study examines the complexity and tensions inherent in teachers’ choices and the implications for students’ short- and long-term learning outcomes.     

Curricula and curricular analysis: Some pointers for a debate

This introduction to our guest-edited issue provides a framework for reflecting on curricula, based on the four still fundamental questions raised by Tyler (Basic principles of curriculum and instruction. University of Chicago Press, Chicago, 1949) about effective ways to organize educational experiences that can meet the school’s educational purpose. The authors begin by decoding the Franco-European and Anglo-Saxon/North American approaches to the concept of curriculum, and seek points where the two are complementary. Using Tyler’s four questions, they then clarify the concept in a conceptual outline, organize it into a rational model, and seek a reference framework that can offer pointers for a debate on curriculum. They then show that, because a curriculum necessarily originates in a specific society, some of that society’s irrationality affects the nature of the curriculum. Thus, any curriculum experiences a tension between the rationality of the models that define it in theoretical terms and the irrationality of its surrounding society—which has the power to regulate it. Therefore, tools for curriculum analysis must consider all these dimensions, contradictions, and tensions to achieve a truly systemic perspective. While a system model is important for evaluation, it is also important to understand the less rational aspects and to place them in dialogue with their models. In this respect, providing pointers for the debate on curriculum remains a perilous exercise. Finally, the authors reflect on a systemic and holistic approach to the curriculum, and suggest pointers for contemporary reflection on curriculum.     

Numerical modeling of DNA-chip hybridization with chaotic advection

We present numerical simulations of DNA-chip hybridization, both in the “static” and “dynamical” cases. In the static case, transport of free targets is limited by molecular diffusion; in the dynamical case, an efficient mixing is achieved by chaotic advection, with a periodic protocol using pumps in a rectangular chamber. This protocol has been shown to achieve rapid and homogeneous mixing. We suppose in our model that all free targets are identical; the chip has different spots on which the probes are fixed, also all identical, and complementary to the targets. The reaction model is an infinite sink potential of width d_h, i.e., a target is captured as soon as it comes close enough to a probe, at a distance lower than d_h. Our results prove that mixing with chaotic advection enables much more rapid hybridization than the static case. We show and explain why the potential width d_h does not play an important role in the final results, and we discuss the role of molecular diffusion. We also recover realistic reaction rates in the static case.     

On passion and sports fans: A look at football

Abstract

The purpose of the present research was to test the applicability of the Dualistic Model of Passion (Vallerand et al., 2003 Vallerand, R. J., Blanchard, C. M., Mageau, G. A., Koestner, R., Ratelle, C.Léonard, M. 2003. Les passions de l'âme: On obsessive and harmonious passion. Journal of Personality and Social Psychology, 85: 756–767. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]) to being a sport (football) fan. Three studies provided support for this dualistic conceptualization of passion. Study 1 showed that harmonious passion was positively associated with adaptive behaviours (e.g. celebrate the team's victory), whereas obsessive passion was positively associated with maladaptive behaviours (e.g. risking losing one's job to go to a game). Study 2 used a short Passion Scale and showed that harmonious passion was positively related to the positive affective life of fans during the 2006 FIFA World Cup, psychological health (self-esteem and life satisfaction), and public displays of adaptive behaviours (e.g. celebrate the team's victory into the streets), whereas obsessive passion was predictive of maladaptive affective life (e.g. hating opposing teams' fans) and behaviours (e.g. mocking opposing teams' fans). Finally, Study 3 examined the role of obsessive passion as a predictor of partner's conflict that in turn undermined partner's relationship satisfaction. Overall, the present results provided support for the Dualistic Model of Passion. The conceptual and applied implications of the findings are discussed.     

Changes in swimming technique during time to exhaustion at freely chosen and controlled stroke rates

Abstract

The aim of this study was to assess technical changes during constrained swimming in time-to-exhaustion tests. Ten swimmers of national standard performed a maximal 400-m front crawl and two sets of exhaustion tests at 95%, 100%, and 110% of mean 400-m speed. In the first set (free), swimmers had to maintain their speeds until exhaustion and mean stroke rate was recorded for each test. In the second set (controlled), the same speed and individual corresponding stroke rate were imposed. The durations of the exhaustion tests, relative durations of the stroke phases, and arm coordination were analysed. For each speed in the “controlled” set, the exhaustion tests were shorter. Moreover, variables were consistent, suggesting a stabilization of stroke technique. Under the free condition, stroke rate increased to compensate for the decrease in stroke length. At the same time, swimmers reduced the relative duration of their non-propulsive phases in favour of the propulsive phases. Thus, swimmers changed their arm coordination, which came close to an opposition mode. These two constraints enable swimmers both to maintain their stroking characteristics and develop compensatory mechanisms to maintain speed. Moreover, stroke rate can be seen as a useful tool for controlling arm technique during paced exercise.     

Impact of hockey skate design on ankle motion and force production

Dynamic forces and range of motion (ROM) were measured during on-ice skating using a standard hockey skate and a modified skate (MS) with an altered tendon guard and eyelet configuration. The objective of this study was to determine if these modifications resulted in biomechanical and performance changes during on-ice skating skills. The right skate of each type was instrumented with a calibrated strain gauge force transducer system to measure medial?Clateral and vertical forces during ice skating. In addition, a goniometer was placed about the ankle and rear foot to measure ROM during skating. Ten subjects executed three skills: forward skating, crossovers inside foot and crossovers outside foot. The MS demonstrated significant gains of 5°?C9° in dorsi-plantarflexion ROM (p?<?0.05). Total peak force occurred later during plantarflexion, suggesting a more prolonged and effective force generation with the MS during a given skating stride. A 14?C20?% increase (p?>?0.05) in mean work and power output was noted with the MS, although no improved times were observed during the skating skills. Potentially, some players may need a period of familiarization to take advantage of the design alterations of the MS.