Integration of reinforcement effects over time

Two accounts of how density of reinforcement affects steady-state performance on probabilistic schedules were compared: the real-time linear operator (RTLO) model and a temporal control model (in which response strength is determined by reinforcement probability as a function of postreinforcement time). In Experiment 1, the probability of reinforcement repeatedly cycled between extinction and a random-ratio 10 schedule. Response-rate gain and phase did not change with period of the cycle as predicted by the RTLO model, nor did either model predict the differences in response rate following reinforcement at different points in the cycle. In Experiment 2, the probability of reinforcement was elevated immediately following a reinforcement but fell after a few seconds. Previous reinforcements had no effect upon responding. An extension of the temporal control model, the cumulative impulse model, allowed for the summing of response strength over successive reinforcements and was consistent with the data of both experiments.     

Naturally Acquired Mentoring Relationships and Young Adult Outcomes Among Adolescents with Learning Disabilities

We evaluated whether having a naturally acquired mentor during adolescence was associated with improved adult outcomes among youth with learning disabilities (YLD). Mentored youth were more likely to have graduated from high school, reported a higher level of self‐esteem, and reported a higher overall number of positive outcomes than nonmentored youth. Mentorship by teachers/guidance counselors was associated with larger differences in high school graduation rates and self‐esteem compared to nonmentored youth whereas mentorship by nonteachers was associated with smaller changes in self‐esteem and no differences in high school completion rates. Future research should include more in‐depth, objective assessments of youths’ learning disabilities, consideration of interactions with concurrent risk factors, and efforts to clarify optimal strategies for mentoring support of YLD.     

Teacher change: ideas emerging from a project for the teaching of university mathematics

This paper reports the changes that occurred in the didactic approaches of three professors who participated in a project intended to develop new ways of teaching mathematics to second year university students. An enactivist perspective is used to address the process of change that emerged as a result from interactions during project meetings. We describe changes in the participants' actions by looking at data obtained from the meetings and the classrooms. Teachers were able to ‘see more’ and modify their teaching practices incorporating a more open and flexible approach in accordance to their structural state which depended on their previous history. Therefore, the results varied. It was possible to observe, however, similar changes in all members of the group which included the use of vocabulary from learning theories and the inclusion of in-depth reflections on teaching and learning.     

The ADHD spectrum and everyday life: experience sampling of adolescent moods, activities, smoking, and drinking

Using an experience sampling methodology, the everyday lives of 153 adolescents with low, middle, or high levels of attention-deficit/hyperactivity disorder (ADHD) characteristics as assessed by either parent or teen were examined. Twice each hour, across two 4-day recording intervals, participants in a longitudinal study of stress and health risks logged their behaviors, moods, and social contexts. Those with high, in contrast to low, ADHD symptom levels recorded more negative and fewer positive moods, lower alertness, more entertaining activities relative to achievement-oriented pursuits, more time with friends and less time with family, and more tobacco and alcohol use. Fewer associations emerged with parent-defined than with teen-defined subgroups, although the differences in alertness, peer and family contexts, entertainment versus achievement activities, and substance use were consistent across sources. Even at subclinical levels, ADHD characteristics were associated with behavioral patterns and contexts that may promote peer deviancy training, unhealthy lifestyle behaviors, and vulnerability to nicotine dependence.     

Energy,macronutrient and water intake during a mountain ultramarathon event: The influence of distance

Adequate dietary strategies are essential for the successful participation in ultra-endurance races. The aim of this study was to evaluate and compare the energy and water intakes of participants during three different mountain ultra-endurance runs. The study took place at the “Ultra Mallorca Serra de Tramuntana” (Mallorca, Spain), an ultra-endurance mountain event with runners participating either in a 44-km (Marathon, n = 51), a 67-km (Trail, n = 109) or a 112-km (Ultra, n = 53) run competition. Participants in the study answered a questionnaire focused on the nutritional intake within an hour after finishing the competition. Mean energy intake during the competitions was 183 kcal · h^¯1, with an average carbohydrate intake of 31 g · h^¯1 (52.1% of participants consumed less than 30 g · h^¯1). No significant differences between competitions were found in these parameters. However, a higher percentage of energy from lipids in participants in the Trail and the Ultra was found (P = 0.034). Furthermore, significant differences were observed in water intake per hour of competition (P = 0.039), with the lowest value for the intake during the Ultra competition. In conclusion, the majority of the participants in the study present low carbohydrate intakes. However, fluid intake seems to be adequate. Different distances did not significantly influence the participants’ nutritional strategies.     

Comparative study of the evaluation of professional competencies by experienced and trainee Spanish primary teachers

Taking as reference the proposals of the European Higher Education Area, the aim of this study is to identify the competencies which a wide sample of teachers in Spanish primary schools (6–12 age group) consider to be important for their professional performance and which they use in their everyday teaching, and to what extent their university training prepared them for their practising professional development. To do this, an ad hoc instrument was devised and applied to experienced practising teachers and to teacher trainees who were on teacher training placements during the last semester of their course. The results of the study show that initial teacher training should deal in depth with the competencies related to the organisation and management of teaching–learning, the use of new technologies in the primary classroom, the involvement of the families, education in values, social skills and skills for working in professional groups. Finally, proposals are made for training based on the articulation between theory and practice, to allow the professional competencies mentioned to be developed and used in practice, as well as encouraging close collaboration between teacher trainers and experienced practising teachers.     

Some Learning Problems Concerning the Use of Symbolic Language in Physics

This paper aims to draw the attention of teachers of basic university physics courses towards students' problems concerning the interpretation of the symbolic language used in the discipline. Specific difficulties found in the first course of physics, related to different kinds of statements expressed in mathematical language, are pointed out and analysed, and some suggestions are made to cope with them during instruction. It could be concluded that teachers may need only to reflect and comment on the virtues of making explicit the semantic and syntactic aspects of formal languages as they teach physics.     

Conflict Management in Pre-schoolers: A cross-cultural perspective La Gestion des Conflits chez les Enfants d'Age Pre´scolaire: Une perspective interculturelle Gestio´n de Conflictos en los Preescolares: Una perspectiva inter-cultural

The aim of the present article is to study of role that cultural differences play in peer interactions. We analysed children's behaviour during play, focusing on the conflicts that took place among pre-schoolers during leisure time, comparing the results obtained between children from Andalusia and Holland. We found a tendency for Andalusian children to prioritise the maintenance of the interaction above personal objectives, as well as a more marked interest in the Dutch pre-schoolers in conserving their own point of view before others, regardless of the possibility of disrupting the activity. Our explanation of the results was supported by consideration of peer interactions as peer cultures, which at the time of producing one's own social order reproduce the order of the adult culture in which they are developing. The influence of the collective - individualistic dimension as centre of important differences between the two cultures completes our argument. Le présent article a pour but d'étudier le rôle des différences culturelles dans l'interaction entre enfants du même âge. Nous avons analysé le comportement d'enfants en train de jouer, en nous concentrant sur les conflits qui se produisaient entre enfants d'âge préscolaire pendant leurs loisirs, et en comparant les résultats obtenus pour des enfants d'Andalouise et de Hollande. Nous avons trouvé que les enfants andalous avaient tendance à donner la priorité à la sauvegarde de l'interaction plutôt qu'à leurs objectifs personnels, tandis que les petits hollandais montraient un intérêt plus marqué envers le maintien de leur point de vue par rapport aux autres, sans se préoccuper de la possibilité de perturber l'activité. L'explication des résultats a été appuyée en considérant les interactions d'enfants du même âge au sein de leur groupe, qui, au moment de la production de leur propre ordre social, reproduisent l'ordre de la culture adulte dans laquelle ils se développent. L'influence du collectif - la dimension individualiste en tant que centre de différences importantes entre les deux cultures - complète notre argument. El objectivo del presente artículo es estudiar el papel que las diferencias culturales juegan en Las interacciones entre iguales. Estudiamos el comportamiento de los niños durante el juego centrándonos en los conflictos que tuvieron lugar entre preescolares a la hora del recreo, comparando los resultados obtenidos entre niños de Andalucía y de Holanda. Descubrimos que había una tendencia en los niños andaluces a priorizar el mantenimiento de la interacción por encima de los objetivos personales, así como un interés más marcado en los preescolares holandeses por conservar su propio punto de vista frente a los demás, sin tener en cuenta la posibilidad de trastornar la actividad. La explicación de los resultados apoyó en la consideración de las interacciones entre iguales, como en cursiva, donde los niños, a la vet de producir que en el momento un producir el orden social propio, reproducen el orden de la cultura adulta en la que se desarrollan. La influencia de la dimensión colectivismo-individualismo como ejc de importantes diferencias entre ambas culturas completa nuesta argumentación.