Transposition of Knowledge: Encountering Proportionality in an Algebra Task

This article reports on an analysis of the process in which knowledge to be taught was transposed into knowledge actually taught, concerning a task including proportional relationships in an algebra setting in a grade 6 classroom. We identified affordances and constraints of the task by describing the mathematical praxeology of the two different types of knowledge exposed, in the task as such and in the activity of the classroom. Through the teacher’s explicit process of reasoning, modeling, revising, solving, and repeatedly explaining the task, we found that the transposition of knowledge was seriously affected by the contextualization of the task. Modeling word problems about everyday situations has its limitations and can, as in this case, make the problem unsolvable unless it is accepted as a “textbook task” disguised as real but adjusted to the norms of school mathematics. Such constraints may obscure mathematical ideas afforded by the task. We conclude that learning opportunities embedded in a task do not necessarily surface when a task is treated in a classroom setting.     

Protection or Participation?

Children’s status as a particularly vulnerable group in society implies a journalistic obligation to shed light on children’s stories and listen to their perspectives, but their vulnerable position also means they deserve protection from potentially harmful news coverage. Based on a close-reading of two extensively covered news serials concerning irregular migrant children facing deportation, and on in-depth interviews with journalists, editors, and key actors working on behalf of irregular migrant children, the present article sheds light on how journalists balance competing, ethical, professional, and organizational concerns when reporting on issues concerning children. The article shows that while journalists say they are aware of the ethical aspects concerning extensive media exposure of young children, they justify the reporting by foregrounding children as innocent victims of the immigration system and by highlighting the journalistic obligation of shedding light on the wrongdoings of this system. The potential burden of media exposure is relativized as less harmful than the alternative—deportation. Theoretically, the article contributes to the literature on children in the news media, human-interest stories and journalism, and the role of journalism reporting vulnerable groups.     

Literacy skills of welfare recipients

Illiteracy is considered to be a significant barrier to employment. Programs are being established to require literacy education and work programs of welfare recipients. The purpose of this study was to determine the literacy skills of a random sample of welfare recipients. One-hundred and six welfare subjects were administered theWoodcock-Johnson Psycho-Educational Battery and a comprehensive interview form. Using common criteria to separate the sample into the literate and functionally illiterate, the groups were found to differ significantly on intellectual capabilities. It was concluded that illiteracy is associated with subaverage intellectual functioning among persons on welfare. A number of recommendations were made pertaining to policy.     

NONVERBAL ASPECTS OF CREATIVE THINKING: STUDIES OF DEAF CHILDREN

Pictorial figural representations are of essential importance in the cognitive development of the deaf. Creative abilities of the deaf were studied with regard to five components of classroom behaviour: motivation, socialization, antisocial behaviour, passiveness and level of intelligence. The subjects were a group of 22 deaf pupils aged 13‐15 and a group of hearing children. The Test of Creative Thinking‐Drawing Productions (TCT‐DP), the Raven Standard Progressive Matrices and the Pupil Behaviour Inventory were used to examine main trends. Comparisons indicated that no significant difference was found between the school functioning of the hearing and the nonhearing in achievement motivation and antisocial behaviour. However in socialization and in intelligence level the nonhearing were significantly lower than the hearing. TCT‐DP results showed that the number of thematic solutions and humour responses increased with deafness, and certain elements became more stereotypical, less individual and less original In addition, IQ in deaf pupils was related to the drawing of concrete objects, whereas in the hearing group intelligence level was related to use of abstractions.     

Quality incentive based congestion control for multimedia communication over IP networks

In this paper we introduce a framework for using quality as an incentive to promote proper application level congestion control. Through integrating a joint-source channel coder and feedback-based congestion control scheme, we are able to construct accurate and efficient quality incentives. The framework is applicable in all network architectures where end-to-end congestion control may be used, and is as such not specific to either best-effort or traffic class-based architectures. The concept is presented along with preliminary simulations that highlight the resulting rate control accuracy. We also discuss how to implement some well-known congestion control schemes within our framework.     

Attentional learning and flexible induction: how mundane mechanisms give rise to smart behaviors

Young children often exhibit flexible behaviors relying on different kinds of information in different situations. This flexibility has been traditionally attributed to conceptual knowledge. Reported research demonstrates that flexibility can be acquired implicitly and it does not require conceptual knowledge. In Experiment 1, 4- to 5-year-olds successfully learned different context-predictor contingencies and subsequently flexibly relied on different predictors in different contexts. Experiments 2A and 2B indicated that flexible generalization stems from implicit attentional learning rather than from rule discovery, and Experiment 3 pointed to very limited strategic control over generalization behaviors in 4- to 5-year-olds. These findings indicate that mundane mechanisms grounded in associative and attentional learning may give rise to smart flexible behaviors.     

Coaches' attitudes towards placebo interventions in sport

Placebo-induced performance enhancement is a new controversial issue in competitive sports. Coaches have control over the use of placebos, but their practices and attitudes were barely studied to date. In this survey 96 coaches from regional, national and international levels were asked about their practices and attitudes concerning placebo use in sports. Results revealed that 90% of the respondents were aware of placebo effects. Many (44%) coaches admitted to administering a placebo to their athletes. Those working at international level have administered placebos more often than the others (P = .02). Two thirds of the coaches agreed to the wider use of placebos in sport. Respondents who have used placebos in the past reported improved athletic performance. They also agreed more to the wider use of placebos than the coaches who previously did not use a placebo (P = .001). Team sport coaches use more often placebos than coaches working with individual athletes (P = .05). Only 10% of the sample thought that their athletes would refuse a hypothetical performance enhancer supplied by them. After a successful placebo intervention, only 15% of the coaches would administer it again without consulting the athlete. Overall, the coaches are optimistic about placebo use in sports. Close to half of them, especially those coaching at higher levels of competition, may use it regularly while achieving positive results.     

Teachers in retreat: The teacher as a dialogical self and the risks of an excessive formalization of its role

The aim of this paper is to explore the identity of the teacher as a dialectical being that is in permanent construction, to identify some obstacles teachers might find in this process while operating in an institutional framework, and the effects these could have upon the teacher and the goals she pursues with her students. By ruling out the idea of identity as an autonomous self that can be constructed with no ties with its context, we propose that identity is dialogical and is built through the relationships we establish with others. This fact situates the relationship between the student and the teacher at the center of pedagogical practices and allows us to establish the ideas of teacher presence and integrity as central elements for the moral development of students. In this context, we identify the excessive institutionalization of the role of the teacher as a cause for the reduction of identity and a defensive retreat to the possible outcomes of being judged by strictly formal criteria, which in turn can hinder the relation between student and teacher and risks possible negative consequences in the moral growth of both.     

What is Intended,What is Realized,and What is Learned? Teaching and Learning Biology in the Primary School Classroom

Within the framework of variation theory, 7- to 12-year-old students’ ways of understanding cellular respiration and photosynthesis were investigated against the background of their teachers’ teaching. Eighteen students were selected by the teachers and interviewed by the researcher. Lessons were observed and video recorded, and stimulated-recall interviews with the teachers were conducted. The students’ understanding of the function of oxygen and sugar in plants was described in four categories. The study concludes that young students can develop complex understanding if opportunities to learn are presented. The opportunities depended mainly on the language used by the teachers, such as metaphors, pointing out critical aspects of the object of learning. The study has implications for the relationship between teachers’ competence and students’ learning.