Argumentation and Conceptualization in Context: a Case Study on Sunshadows in Primary School

I will analyse the individual and collective activities of fourth grade students while trying to explain a schoolfellow's mistake in the use of a geometrical schema (shared by the class) of the sunshadows phenomenon. The study aims at detecting productive links between context-related argumentation, mathematical modelling (here concerning sunshadows) and conceptualization (inclination of a straight line to a plane), as well as discussing their relevance for mathematics education. This revised version was published online in July 2006 with corrections to the Cover Date.     

Proactive interference of open field on consummatory successive negative contrast

Reactivity to a reward is affected by prior experience with the different reinforcer values of that reward, a phenomenon known as incentive relativity, which can be studied using the consummatory succesive negative contrast (cSNC) paradigm, in which the performance of animals that receive a 4 % sucrose solution after trials on which they were exposed to 32 % sucrose is compared with that of subjects that always receive the 4 % sucrose solution. The exploration of a novel open field can enhance or block the acquisition of associative and nonassociative memories. The effect of open field on cSNC has not yet been explored. The main result of the present study was that open-field exposure significantly modified the expression of cSNC. Exposure to an open field 1 h but not immediately before the downshift interfered with the expression of cSNC. These animals drank more of the downshifted reward than did controls that were not exposed to the apparatus, and this behavior persisted for up to three recovery trials. This phenomenon was observed even when the animals were given a more protracted preshift phase and when the discrepancy between the preshift and shift incentive values of sucrose were increased. An open field also interfered with incentive downshift when open-field exposure occurred 6 h before the downshift, and repeated exposure to the apparatus did not deteriorate this effect. The present study adds to a growing body of literature that indicates that open-field exploration can interfere with memory formation.     

Visualizing Humans by Computer

Abstract

This paper gives an overview of the problems involved in visualizing humans in a three‐dimensional scene, and looks at the history and development of human shape modelling, human motion control, and modelling of human characteristics and clothing to produce computer‐generated actors.     

The potential for developing educational farms: a SWOT analysis from a case study

ABSTRACT

Purpose: Educational farms (EFs) serve a number of social and economic functions and are part of the debate about new learning environments, multifunctional agriculture and firm diversification. Through the analysis of a case study, this paper aims to identify strengths and weaknesses, opportunities and threats (SWOT) of EFs and key factors for setting a development strategy.

Design/Methodology/Approach: A direct survey to EFs in Molise region (IT) was implemented during April-May 2017 and results were assessed following a SWOT approach.

Findings: Strong motivation and connection with agritourism activities are strengths of EFs in the region; small size, unskilled staff, lack of structured educational pathways, and limited profitability are the main weaknesses. Farms opportunities come from a territory rich in rural landscapes, environmental resources, and typical food products, and from a growing demand for educational tourism. Obstacles are in the institutional sphere and due to the absence of regional networks. Based on SWOT findings, key factors for EFs development are discussed.

Practical implications: EFs development requires innovative educational and managerial tools, a more concerted and proactive role for multiple stakeholders, and the implementation of a network approach. Study findings solicit actions from public institutions and advisory services to improve farmers’ skills.

Theoretical implications: The paper contributes to the theoretical debate about the need for a multidisciplinary approach in dealing with the analysis of EFs.

Originality/Value: The analysis underlines the importance of internal and external drivers in stimulating farms and institutions to support diversification strategies, rural development and transformation processes in inner areas.     

Discrimination of Biomechanically Possible and Impossible Hand Movements at Birth

The development of human body perception has long been investigated, but little is known about its early origins. This study focused on how a body part highly relevant to the human species, namely the hand, is perceived a few days after birth. Using a preferential‐looking paradigm, 24‐ to 48‐hr‐old newborns watched biomechanically possible and impossible dynamic hand gestures (Experiment 1, N = 15) and static hand postures (Experiment 2, N = 15). In Experiment 1, newborns looked longer at the impossible, compared to the possible, hand movement, whereas in Experiment 2 no visual preference emerged. These findings suggest that early in life the representation of the human body may be shaped by sensory‐motor experience.     

Coloured filters improve exclusion of perceptual noise in visually symptomatic dyslexics

Previous studies of visually symptomatic dyslexics have found that their contrast thresholds for pattern discrimination are the same as non‐dyslexics. However, when noise is added to the stimuli, contrast thresholds rise markedly in dyslexics compared with non‐dyslexics. This result could be due to impaired noise exclusion in dyslexics. Some dyslexics report a reduction in discomfort experienced while reading and show increased reading speed when using coloured lenses. We hypothesised that coloured lenses work by aiding noise exclusion. Thus the coloured lenses should help performance best under conditions of high visual noise. We measured contrast thresholds for discriminating symbols in the absence and presence of visual noise. The results showed that visually symptomatic dyslexics, who otherwise had elevated contrast thresholds for discriminating symbols in visual noise, had thresholds similar to non‐dyslexics when wearing coloured filters. These findings provide evidence that in visually symptomatic dyslexics coloured filters can improve noise exclusion to normal levels.     

Information practices of Canadian Muslims post 9/11

This article explores how the post 9/11 climate has impacted Muslim-Canadians' information practices, including their uses of various information sources, and their attitudes and perceptions regarding their information rights in a post 9/11 world. A survey was conducted in 2004-2005 with 120 participants and supplemented by in-depth interviews. The population consisted of Muslim students enrolled in post-secondary institutions in Toronto, Ontario. The findings highlight Muslims' malaise in a post 9/11 environment; the deep mistrust they hold vis-à-vis the media; the importance they give to media and information literacy skills for all; as well as a call for increased introspection inside the Muslim community(ies). The study contributes to shedding light on a community that has often being talked and written about but not often heard. By soliciting Muslim individuals' perspectives, we enable them to voice their opinions about how the 9/11 events impacted on their lives and how their information practices inform their experiences.     

Socio-economic segregation of disadvantaged children between schools in Pakistan: comparing the state and private sector

The distribution of children in different school-types and regions in Pakistan suggests that access and opportunities in education are not evenly accessible for many children. Segregation at school level is an important concern for equity and social justice because the adverse effects of segregation increase the pre-existing gap in opportunities between rich and poor, preventing the disadvantaged children from equal access to better life and success opportunities. This paper presents an analysis of segregation by poverty and pupil performance between schools, with a comparison of private and government schools in Pakistan. The data obtained for this study is from the Annual Status of Education Report 2014 survey of households and schools. The analysis includes 27,979 children aged 5–16 years for whom the information could be linked with their schools, and parents’ socio-economic status. Segregation levels have been assessed using the Gorard Segregation Index. The results show that segregation by academic performance is higher than segregation by poverty, and segregation by poverty is higher in the private sector compared to government schools, whereas segregation by performance is greater in the government schools. A regional level analysis shows that segregation in urban areas is higher in both school types compared to rural areas. In addition to insisting on full attendance for children of school age, the government should work towards decreasing segregation in the state sector, perhaps also involving an increase in the number of schools maintained, and therefore reducing the need for cheap private provision.     

The teaching profession against the background of educationalisation: an exploratory study

This article focuses on the teaching profession against the background of educationalisation in the Netherlands in the sense that Dutch schools are increasingly regarded as focal points at which to address and solve social issues. Our research project concentrated on the extent to which teachers, being key figures in the school organisation, understand their role as one that embraces a social in addition to an educational mission. It explores teachers’ professional identity and their awareness, task perception and self-efficacy with respect to performing a social mission. The results show that ‘addressing social issues’ can be identified as a dimension of teachers’ professional identity. However, teachers report low self-efficacy as regards carrying out social tasks, irrespective of their task perception and awareness. The phenomenon of educationalisation is occurring in other Western European countries and in the US. The results of this exploratory study raise questions about the feasibility of educationalising social problems.