La mejora de la comprensión lectora: un análisis interactivo

Resumen

El presente trabajo analiza, desde un enfoque interactivo, algunas características del texto y del lector. Desde esta perspectiva se revisan algunos de los modelos de intervención encaminados a facilitar en el sujeto el producto final de la comprensión lectora. Como es sabido, esta intervención puede introducirse tanto desde el mismo material escrito, a través de técnicas y recursos sobre planes de escritura que aplica el escritor, como desde las características del lector, como es el conocimiento previo y el uso de estrategias lectoras más eficaces en los sujetos. Desde esta última perspectiva incidimos especialmente en aquellos entrenamientos de estrategias encaminadas a potenciar un conocimiento y aplicación de la estructura organizativa de los textos.     

Relación de la variable edad con las deficiencias de escolarización en la EGB

Resumen

El presente estudio analiza los deterioros de escolarización que sufren los niños más jóvenes de un mismo curso en comparación con los mayores, dentro del año natural. Se llevó a cabo en un Colegio Público de Hospitalet, con los niños que habían repetido, o habían asistido a las Aulas de Educación Especial, mediante un análisis comparativo de frecuencias variables en las distintas muestras.

Los resultados confirman la idea existente de que la diferencia de edad en los primeros niveles es origen de situaciones escolares deficitarias, irreversibles en gran parte de tos casos.

Se plantea, a modo de conclusión, a los responsables educativos, la necesidad de sustituir el agrupamiento por año natural, vigente en la actualidad por otras formas Je agrupamiento, que puedan dar una respuesta más apropiada a la demanda evolutiva de los niños más jóvenes de cada año natural.     

La dificultad de enseñar el razonamiento proporcional

Resumen

En este artículo se da cuenta de un experimento en el que se enseñó a sujetos cuya edad oscilaba entre los catorce y los diecisiete años a resolver tareas lógico-formales de carácter proporcional (balanza y comparación de proporciones) vinculadas al grupo INRC. Se trataba de ver: 1° Si se produce el aprendizaje deseado y 2° si el sujeto transfiere lo aprendido a otras tareas vinculadas a la misma estructura formal (grupo INRC) y a otras distintas (retículo).

Los resultados muestran un moderado éxito, según el tratamiento dado, en el aprendizaje de la tarea enseñada, y, una escasa o nula transferencia a tareas de similar estructura lógico-formal a las utilizadas en el aprendizaje.     

Grade level, study time, and grade retention and their effects on motivation, self-regulated learning strategies, and mathematics achievement: a structural equation model

The present study complements previous research findings with new data to improve our understanding of the relationship between motivational variables and academic performance in math mediated by self-regulated learning (SRL). A structural equation model with predictor (i.e., grade retention, grade level, and study time), process (i.e., perceived usefulness of SRL strategies, self-efficacy for the use of SRL strategies, and reported use of SRL), and product variables (i.e., academic achievement in mathematics) is proposed. The model was analyzed in two samples of data (calibration and validation samples). The first sample served to fit and respecify the model, and the second one was used to analyze the consistency of the findings of the first sample. A sample of 756 middle school Portuguese students participated in the current study. The results indicate that SRL is positively and significantly related to academic achievement and that the latter is, in turn, powerfully determined by perceived usefulness and self-efficacy, although students’ reported use of SRL strategies decreases from 7th to 9th grades. Self-efficacy and perceived usefulness of SRL strategies were also found to decrease as grade retention increased. These results are discussed with regard to the relevance of self-efficacy and perceived usefulness of SRL strategies in increasing academic achievement.     

The Engagement of Older People in Civil Society Organizations

This article reviews recent international literature on the opportunities and restrictions experienced by older people to act as volunteers in civil society organizations. Our aim was to develop a conceptual framework applicable to the European ageing society. This aim was pursued through a computerized database search focused on studies analyzing the individual, organizational, and/or societal levels. Findings show that senior volunteers are characterized by “younger” age, good health, and a high level of both educational and socioeconomical status. Volunteers are involved mainly in religious organizations as well as in social and personal care, while main barriers are represented especially by ageist practices. The review shows that the debate on this topic has been barely developed in Europe, both from an individual and societal point of view. Therefore, European countries might take advantage from experiences made in other contexts, but the identification of how this can occur requires further and more specific cross-national research.     

Coherence estimate between a random and a periodic signal: Bias, variance, analytical critical values, and normalizing transforms

The present work deals with recent results on the sampling distribution of the magnitude-squared coherence (also called just coherence) estimate between a random (Gaussian) and a periodic signal, in order to obtain analytical critical values, alternative expressions for the probability density function (PDF) as well as the variance and bias of the estimate. A comparison with the more general case of coherence estimation when both signals are Gaussian was also provided. The results indicate that the smaller the true coherence (TC) values the closer both distributions become. The behaviour of variance and bias as a function of the number of data segments and the TC is similar for both coherence estimates. Additionally, the effect of a normalizing function (Fisher's z transform) in the coherence estimated between a random and a periodic signal was also evaluated and normality has been nearly achieved. However, the variance was less equalized in comparison with coherence estimate between two Gaussian signals.     

Using genetic algorithms to evolve a population of topical queries

Systems for searching the Web based on thematic contexts can be built on top of a conventional search engine and benefit from the huge amount of content as well as from the functionality available through the search engine interface. The quality of the material collected by such systems is highly dependant on the vocabulary used to generate the search queries. In this scenario, selecting good query terms can be seen as an optimization problem where the objective function to be optimized is based on the effectiveness of a query to retrieve relevant material. Some characteristics of this optimization problem are: (1) the high-dimensionality of the search space, where candidate solutions are queries and each term corresponds to a different dimension, (2) the existence of acceptable suboptimal solutions, (3) the possibility of finding multiple solutions, and in many cases (4) the quest for novelty. This article describes optimization techniques based on Genetic Algorithms to evolve “good query terms” in the context of a given topic. The proposed techniques place emphasis on searching for novel material that is related to the search context. We discuss the use of a mutation pool to allow the generation of queries with new terms, study the effect of different mutation rates on the exploration of query-space, and discuss the use of a especially developed fitness function that favors the construction of queries containing novel but related terms.     

Effects of plyometric jump training in female soccer player’s vertical jump height: A systematic review with meta-analysis

ABSTRACT

To assess the effects of plyometric jump training (PJT) in female soccer player’s vertical jump height, a review was conducted using the data sources PubMed, MEDLINE, Web Of Science and SCOPUS. Only peer-review articles were included. To qualify for inclusion in the meta-analysis, studies must have included (i) a PJT programme of at least 2 weeks, (ii) cohorts of healthy female soccer players with no restriction for age, (iii) a control group, (iv) a measure of countermovement jump (CMJ). The inverse variance random-effects model for meta-analyses was used. From 7,136 records initially identified through database searching, 8 were eligible for meta-analysis, comprising 9 training groups (n = 99) and 9 control groups (n = 94). The magnitude of the main effect was moderate (ES = 1.01 [95%CI = 0.36–1.66], Z = 3.04, p = 0.002). Sub-group analyses were performed (i.e., PJT frequency, duration and total number of sessions), revealing no significant subgroup differences (p = 0.34–0.96). Among the studies included in this review, none reported injury or other adverse effects. In conclusion, PJT is effective in female soccer players for the improvement of vertical jump height. In future, research must identify specific dose–response relationships following PJT, particularly in the long term.