Fonctions du code symbolique dans le discours mathématique

Résumé Nous avons fait une étude des fonctions du code symbolique au sein du discours mathématique. Nous avons distingué trois grandes catégories non exclusives: des fonctions de désignation, des fonctions de relation entre objets mathématiques, des fonctions logiques. Nous pensons avoir ainsi dégagé des aspects producteurs de son utilisation mais en même temps nous avons mis en évidence des significations implicites inhérentes à son emploi donc des aspects réducteurs. De plus, nous avons étudié certaines formulations d'étudiants en rapport avec ce travail. En particulier nous avons observé comment et à quelle occasion des étudiants du premier cycle universitaire français explicitent le quantificateur existentiel.

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The functions of symbolic code in mathematical communication

We have studied the functions of symbolic code in mathematical communication. We distinguish three major non-exclusive categories: functions of designation, functions of relation between mathematical objects, logical functions. We bring out some productive aspects of the use of symbolic code, but also point out some implicit meanings, inherent in its use, which have counterproductive aspects. In addition, we have studied certain student formulations relating to this work. In particular, we have observed how, and on what occasions, students in the first cycle of French university study make explicit the existential quantifier.

     

Exerted effort and performance in climbing among boys: the influence of achievement goals,perceived ability,and task difficulty

In achievement contexts such as sport, achievement goal theory assumes that an individual's major concern is to demonstrate competence. However, competence may be expressed in two ways: as task and ego involvement (Nicholls, 1989). Seventy-eight boys (M age = 13.6 years) performed five climbing courses, and the influence of achievement goals, perceived ability, and task difficulty on effort and performance was studied. According to the achievement goal theory: (a) task-involved boys exerted more effort and performed better than ego-involved boys; and (b) exerted effort was determined by an interaction of one's achievement goal, perceived ability (PA), and task difficulty. Ego-high PA boys and task-low PA boys exerted the most effort on the moderate course; ego-low PA boys exerted least effort on the moderate and very difficult courses. Finally, task-high PA boys exerted more effort on the most difficult courses. The motivational processes underlying these findings are discussed.     

Height, mass and skeletal maturity of elite Portuguese soccer players aged 11-16 years

Height, mass and skeletal maturity (Fels method) were assessed in 135 elite youth soccer players aged 10.7-16.5 years (only two boys were < 11.0 years). Sample sizes, years of training and current weekly training volume by two-year age groups were: 11-12 years (n = 63), 2.6 +/- 1.0 years and 4.1 +/- 1.7 h; 13-14 years (n = 29), 3.1 +/- 1.6 years and 4.5 +/- 1.7 h; 15-16 years (n = 43), 4.7 +/- 2.4 years and 6.1 +/- 2.0 h. The oldest age group included members of the national youth team. Heights and masses were compared to US reference values, and skeletal age and chronological age were contrasted. The players were also classified as late, average ('on time') and early maturers on the basis of differences between skeletal and chronological age, with the average category including boys with skeletal ages within +/- 1 year of chronological age. The mean heights and masses of 11- to 12-year-old soccer players equalled the US reference values, while those of players aged 13-14 and 15-16 years were slightly above the reference values. The mean skeletal age approximated mean chronological age in players aged 11-12 years (12.4 +/- 1.3 and 12.3 +/- 0.5 years, respectively), while mean skeletal age was in advance of mean chronological age in the two older groups (14.3 +/- 1.2 and 13.6 +/- 0.7 years, respectively, in 13- to 14-year-olds; 16.7 +/- 1.0 and 15.8 +/- 0.4 years, respectively, in 15- to 16-year-olds). Seven boys in the oldest age group were already skeletally mature and were not included when calculating differences between skeletal and chronological age. The proportion of late maturing boys in this sample of elite soccer players decreased with increasing chronological age. Among 11- to 12-year-old players, the percentages of late and early maturing boys were equal at 21% (n = 13). Among 13- to 14-year-old players, the percentages of late and early maturing boys were 7% (n = 2) and 38% (n = 11) respectively, while among players aged 15-16 years the percentages of late and early maturing boys were 2% (n = 1) and 65% (n = 28) respectively. The results of this comparative analysis suggest that the sport of soccer systematically excludes late maturing boys and favours average and early maturing boys as chronological age and sport specialization increase. It is also possible that late maturing boys selectively drop-out of soccer as age and sport specialization increase.     

The Drug Resistance Strategies Project as Translational Research

This paper tells the story of the multi-layered translational process of the Drug Resistance Strategies Project. The Drug Resistance Strategies Project provides an exemplar of translational scholarship, translating adolescent narratives about their substance use experiences into an efficacious, substance abuse prevention middle school curriculum. The curriculum, called keepin' it REAL, was developed using the principle of cultural grounding and translational performances and has been found to reduce adolescent substance use. The authors tell the story of this project from its inception to its current role as a model substance abuse prevention program.     

Inequality of educational opportunities: School failure trends in Spain (1977–2012)

School failure is substantive in Spain. The percentage of students that do not achieve the compulsory education diploma is around 20%. School failure is higher for students from lower socio-economic backgrounds. Students who ‘fail’ cannot continue to post-compulsory education and, sooner or later, they have to leave formal education. The evolution of school failure in Spain follows a U-shaped curve that decreases from the seventies and rises from the end of the past century. This article explores the evolution of the impact of students’ socio-economic backgrounds on school failure from the seventies onwards and tests whether this impact increased at the end of last century. Using logit models of estimation to control for socio-demographic factors, we demonstrate that students from higher socio-economic backgrounds show fewer fluctuations in school failure than students from lower socio-economic backgrounds. We also provide evidence in support of an increase in the impact of socio-economic background on school failure from the end of the past century, thereby increasing differences by social origin of students. Our paper is consistent with previous literature showing that the impact of socio-economic background on school failure from the seventies onwards is declining. Nevertheless, we show an increase in this impact from the late nineties not described before. We offer a possible explanation for this upward trend in the shape of change in the institutional structure of the education system, although labour market incentives may also have played a role.     

Emotional intelligence profiles and learning strategies in secondary school students

The aim of this study was to analyse the relationship among emotional intelligence (EI) and learning strategies, identifying different emotional intelligence profiles and determining possible statistically significant differences in learning strategies through the identified profiles. Thousand and seventy one Spaniards secondary school students aged 14–17 participated in the study, completing the Trait Meta-Mood Scale-24 (TMMS-24) and the Cuestionario de Estrategias de Aprendizaje [Learning Strategies Questionnaire] (LSQ). Cluster analysis identified four differentiated EI profiles: a group of adolescents with a low EI profile, a group with high scores in attention and low scores in repair, a high EI profile group, and a group of adolescents with predominance of low attention and high repair. The results also revealed statistically significant differences among the profiles in most of the learning strategies, in which students with high general EI and those with predominance of low attention and high repair use more learning strategies than the other groups, suggesting the importance of developing programmes of emotional skills to study in greater depth EI and its influence on students’ learning strategies.     

Lost in translation: methodological considerations in cross-cultural research

In cross-cultural child development research there is often a need to translate instruments and instructions to languages other than English. Typically, the translation process focuses on ensuring linguistic equivalence. However, establishment of linguistic equivalence through translation techniques is often not sufficient to guard against validity threats. In addition to linguistic equivalence, functional equivalence, cultural equivalence, and metric equivalence are factors that need to be considered when research methods are translated to other languages. This article first examines cross-cultural threats to validity in research. Next, each of the preceding factors is illustrated with examples from the literature. Finally, suggestions for incorporating each factor into research studies of child development are given.