Comparing cognitive performance in illiterate and literate children

While it is known that the process of becoming literate begins in early childhood and usually involves several years of schooling, research related to cognitive characteristics has been done mostly on illiterate adults, and information concerning illiterate children is therefore limited. The aim of the present study, involving 21 illiterate and 22 literate Mexican children aged 6 to 13, was to investigate the effects of literacy on neuropsychological characteristics during childhood. The children??s performance on 16 cognitive domains of the Evaluación Neuropsicológica Infantil (ENI, Child Neuropsychological Assessment) was examined in three mixed within- and between-groups profile analyses. The results suggest that the effect of literacy observed in adults is already evident in children in almost every task analysed. Moreover, the fact that an age effect was detected for the calculation abilities suggests that maths learning is school- and environment-dependent.     

The Minimization of Public Health Risks in Newspapers after Hurricane Katrina

During natural disasters, mass media facilitate the timely provision of accurate information about health risks to the public. This study informs our understanding of such public health discourse, utilizing a content-analysis of 235 newspaper articles in four major metropolitan newspapers published in the five weeks after Hurricane Katrina hit the Gulf Coast in August 2005. These data reveal that a small and diminishing number of articles included public health information over time, detailed the hurricane impact on affected communities, and used reliable health sources. The implications for future research from a public health and media relations perspective are discussed.     

The use of a school value-added model for educational improvement: a case study from the Portuguese primary education system

This article focuses on the use of a value-added approach for promoting school improvement. It presents yearly value-added estimates, analyses their stability over time, and discusses the contribution of this methodological approach for promoting school improvement programmes in the Portuguese system of evaluation. The value-added model is applied to longitudinal data gathered from a representative sample of students enrolled in primary school, using mathematics scores as outcome variable. The estimates are used to determine a systematic positive or negative school value-added effect. Results indicate that at least 41% of schools remain at the same level over 3 years, 15% present an instable pattern, and approximately 40% show a positive or negative trend. It is argued that these results, especially those that reveal systematically underperforming schools, could have relevant implications for educational policy geared towards school improvement.     

Constitutive Pluralism of Chemistry: Thought Planning, Curriculum, Epistemological and Didactic Orientations

Maybe the most difficult aspect of thinking about chemistry arises from the fact that chemistry isn’t an homogeneous subject. As a central science, it draws on a range of philosophical perspectives which in turn can result in different cognitive, learning and teaching styles in chemical education. This idea, apparently non-controversial, needs to be validated by more research. Without assuming this constitutive pluralism, describing it, and determining it, it becomes difficult to think of curricular goals and content. Thus, if we intend to improve the teaching of chemistry it is necessary, first, to assume explicitly this constitutive pluralism, then to map it in order to find the guiding principles: first for the mind (thought process), then for the curriculum and finally for the teaching, in such a way that it is as close as possible to the chemical way of operating and thinking. This is the aim of this paper. It reports the authors’ experiences in drafting structural ideas and planning for the subject “didactic of chemistry” based on the philosophy of chemistry at the University of Porto in Portugal.     

Developing School Media Libraries for the Autonomy of Linguistic Minorities

Abstract

This article discusses the role played by socio‐educational documents, from schools or local media libraries, in the everyday life of the linguistic minority learner.     

Dislexia fonémica: decodificación-codificación fonémica y comprensión lectora silenciosa

Resumen

Se estudiaron los procesos fonémicos de decodificación y codificación en relaáón a la comprensión lectora en una muestra de 49 disléxicos de 10 a 12 años, comparándolos con un grupo de 32 lectores normales, pareados por edad, curso y nivel socio-económico. Todos los niños tenían un CI normal y se les aplicó cuatro tests verbales estandarizados, más tareas experimentales de percepción, discriminación e integración auditivo-fonémica y de comprensión.

Se pudo delimitar, dentro de los disléxicos, un subgrupo de ellos con un rendimiento inferior en decodificación de pseudo-palabras, perceptión auditivo-fonémica, comprensión verbal oral y comprensión lectora silenciosa, lo que confirmó la hipótesis principal del estudio. Las diferencias entre disléxicos y lectores normales también fueron significativas. Los procesos fonémicos más estrechamente relaáonados con lectura y deletreo de pseudopalabras fueron discriminación auditiva de palabras similares e inversión oral de secuencias de letras CVC (trigramas). Esta investigación forma parte de un estudio de seguimiento.     

The study of the pupil’s cognitive structure: the concept of angle

The present research approached a problem which has a twofold aspect: the concept of angle and the techniques needed to represent how pupils construct that concept in their cognitive structure during their years in school. In order to access the knowledge of the concept of angle, we used the pathfinder associative networks. This technique provided us with the data of the 458 networks of the participating students, using 11 concepts related to the general concept of angle. We used quantitative indicators on the network characteristics: coherence, complexity, and similarity with others. Results showed how the pupil’s cognitive structure evolutioned during instruction and what were the most relevant concepts for them. On the basis of the results, we have proposed what we call the “Theory of Nuclear Concepts” which offers a new focus to understanding how the processes of teaching and learning occur.     

A Cross-age Study of Senior High School Students' Conceptions of Basic Astronomy Concepts

Senior high school students' astronomy conceptions were analysed by means of a written questionnaire presented to them during the beginning of the first semester. The main findings were: (1) Most students answered correctly the questions dealing with the following subjects: the day-night cycle, the reason for the different seasons, and the time of the Moon's revolution around the Earth and the Sun. (2) Most students chose their best account for changes in the Moon's phases as the Moon moving around the Earth. Despite that, most students thought that the Moon must be in its full phase in order to get a total solar eclipse. (3) Most students underestimated distances in the Universe and overestimated the Earth's diameter. (4) Most students answered incorrectly the questions dealing with the following subjects: Sun overhead at noon, longitude time zones, and Moon's rotation. (5) Students studying physics succeeded significantly better than their colleagues in some of the subjects that were taught as a part of their optics and mechanics courses.     

Adjunctive behaviors are operants

Adjunctive behaviors such as schedule-induced polydipsia are said to be induced by periodic delivery of incentives, but not reinforced by them. That standard treatment assumes that contingency is necessary for conditioning and that delay of reinforcement gradients are very steep. The arguments and evidence for this position are reviewed and rejected. In their place, data are presented that imply different gradients for different classes of responses. Proximity between response and reinforcer, rather than contingency or contiguity, is offered as a key principle of association. These conceptions organize a wide variety of observations and provide the rudiments for a more general theory of conditioning.     

On the Concept of Force: How Understanding its History can Improve Physics Teaching

Some physicists have pointed out that we do not know what force is. The most common definition of force in textbooks has been criticized for more than two centuries. Many studies have shown that the concept of force is a problem for teaching. How to conceive force on the basis of the concepts and criticism of force in the works of Newton, Euler, d’Alembert, Lagrange, Lazare Carnot, Saint-Venant, Reech, Kirchhoff, Mach, Hertz and Poincaré is the question of the present article. This part of the article is followed by an overview of definitions of force in contemporary textbooks. In the next part, an answer to the question is given: how to understand force within the framework of the laws of motion and in applications. Finally, some educational implications are considered.