Student teachers’ perceptions of their mentors as internal triggers for learning

This study used responses of 20 student teachers to describe the different ways in which student teachers perceive the practice of their mentors as internal triggers for learning in their practicum experiences in the schools. Reported observations from pedagogical journals of student teachers were described according to various kinds of teaching knowledge and skills and were further categorized as providing either support or challenge to student teachers’ perceptions of learning to teach. The student teachers identified support and challenge in each one of the categories of teaching knowledge and skills, thereby supplying evidence for different kinds of emotional and cognitive triggers for learning. Based on the findings, we make some recommendations for supervision of mentoring relationships.     

Creatine kinase,myosin heavy chains and magnetic resonance imaging after eccentric exercise

The aim of this study was to examine the relationship between myosin heavy chain (MHC) release as a specific marker of slow-twitch muscle fibre breakdown and magnetic resonance imaging (MRI) of skeletal muscle injury after eccentric exercise. The effects of a single series of 70 high-intensity eccentric contractions of the quadriceps femoris muscle group (single leg) on plasma concentrations of creatine kinase and MHC fragments were assessed in 10 young male sport education trainees before and 1 and 4 days after exercise. To visualize muscle injury, MRI of the loaded thigh was performed before and 4 days after the eccentric exercise. All participants recorded an increase ( P ? 0.05) in creatine kinase after exercise. In five participants, T2 signal intensity was unchanged post-exercise compared with pre-exercise and MHC plasma concentration was normal; however, they showed an increase ( P ? 0.05) in creatine kinase after exercise. For the remaining five participants, there was an increase in T2 signal intensity of the loaded vastus intermedius and vastus lateralis. These changes in MRI were accompanied by an increase in MHC plasma concentration ( P ? 0.01) as well as an increase in creatine kinase ( P ? 0.01). We suggest that changes in MRI T2 signal intensity after muscle damage induced by eccentric exercise are closely related to damage to structurally bound contractile filaments of some muscle fibres. Additionally, MHC plasma release indicates that this damage affects not only fast-twitch fibres but also some slow-twitch fibres.     

Visibility and differentiation: systemic testing in a developing country context

Why has large-scale standardised testing attracted such a bad press? Why has pedagogic benefit to be derived from test results been downplayed? The paper investigates this question by first surveying the pros and cons of testing in the literature, and goes on to examine educators' responses to standardised, large-scale tests in a sample of low socio-economic status (SES) schools in the Western Cape, South Africa. The paper shows that teachers and school managers have an ambivalent attitude to tests, wary of the reputational costs they can incur, but also curious about the differentiated picture test results can give them as they learn to ‘read’ the underlying codes embedded in the results. The paper concludes that a focus on what tests make visible and a recognition of the pedagogic agency of teachers points to potential pedagogic benefits of systemic tests.     

Language and reading impairments are associated with increased prevalence of non-right-handedness

Handedness has been studied for association with language-related disorders because of its link with language hemispheric dominance. No clear pattern has emerged, possibly because of small samples, publication bias, and heterogeneous criteria across studies. Non-right-handedness (NRH) frequency was assessed in N = 2503 cases with reading and/or language impairment and N = 4316 sex-matched controls identified from 10 distinct cohorts (age range 6–19 years old; European ethnicity) using a priori set criteria. A meta-analysis (N_cases = 1994) showed elevated NRH % in individuals with language/reading impairment compared with controls (OR = 1.21, CI = 1.06–1.39, p = .01). The association between reading/language impairments and NRH could result from shared pathways underlying brain lateralization, handedness, and cognitive functions.     

The economic returns to investment in women's education

The paper discusses the problems of measuring the rate of return to women's education, and evidence is presented for nine countries which shows that the returns to secondary and higher education are on average two percentage points lower for women than for men, but in some countries they are actually higher. Education increases the earning capacity of women, and also increases their propensity to remain in the labour market. But some allowance must be made for the value of women's non-market work, for indirect benefits of education, and for psychic income. Various methods are suggested for measuring the non-monetary benefits of education, such as the intergeneration effect of a mother's education on the future achievement of her children, or the non-pecuniary benefits of employment for women in the labour force. The effects of discrimination on women's earnings and job prospects are discussed, and it is shown that a large part of the observed differential between male and female earnings is due to the concentration of women in low-income occupations. The paper concludes that the difference between the returns to education for men and women is less than is often suggested, particularly if some attempt is made to measure nonmonetary benefits. But the returns to women's education would be increased if there were a change in traditional attitudes leading to a more equal occupational distribution and better utilisation of women in the labour force.     

Qualitative Differences Between Learning Environments Using Videos in Small Groups and Whole Class Discussions: A Preliminary Study in Physics

Interactivity, group learning and student engagement are accepted as key features of social constructivist learning theories. The challenge is to understand the interplay between such features in different learning environments. This study focused on the qualitative differences between two interventions—small-groups and whole-class discussions. In both interventions, three short video slices on the abstract topic ‘the physics of superconductivity’ were interspersed with the different discussion styles. The video slices are based on the Bruner stages. Twenty-nine first year university physics students completed a pre-test, underwent the intervention and completed a post-test. The remainder of the data were collected from student drawings, video recordings, observer notes and facilitator feedback. Results indicate that the use of the video slices in both interventions were successful in changing students’ understandings of superconductivity. However, the small groups treatment tended to facilitate questioning, meaning-making and subsequent changes of ideas more so than the whole class discussions. Implications for research and practice are discussed.