Effects of time of day and distance upon accuracy and consistency of throwing darts

We examined variations in dart-throwing performance during the daytime in 12 participants. Two distances from the dartboard were investigated - the normal distance (short throws) and another 50% further away than this (long throws). Intra-aural temperature and subjective fatigue were measured, and errors in performance were assessed as the radial distances of throws from the bulls-eye and the standard deviation of these distances. Long-distance throws improved significantly throughout the daytime and correlated positively with intra-aural temperature (r= -0.49, P=0.002 and r= -0.49, P=0.002 for errors and standard deviation of errors, respectively), but not with subjective fatigue (r= -0.10, P=0.56 and r= -0.05, P=0.74 for errors and standard deviation of errors, respectively). Short-distance throws were associated less with intra-aural temperature (r= -0.46, P= 0.005 and r= -0.17, P=0.31 for errors and standard deviation of errors, respectively), and worsened with fatigue (r=+0.34, P= 0.040 for errors). Compared with the short-distance throws, the long-distance throws were performed significantly less well than could be accounted for by the increased distance (mean errors were increased 1.67-2.78 times and standard deviation of errors of errors 1.58-3.68 times), supporting the concept of a trade-off between force of contraction and accuracy of performance. Throwing darts can be used as a model for investigating factors that influence motor performance, and our results indicate that the effects of time of day upon performance depend upon the relative importance of force and accuracy.     

The ontogeny of phonological categories and the primacy of lexical learning in linguistic development

In this paper, we draw on recent developments in several areas of cognitive science that suggest that the lexicon is at the core of grammatical generalizations at several different levels of representation. Evidence comes from many sources, including recent studies on language processing in adults and on language acquisition in children. Phonological behavior is influenced very early by pattern frequency in the lexicon of the ambient language, and we propose that phonological acquisition might provide the initial bootstrapping into grammatical generalization in general. The phonological categories over which pattern frequencies are calculated, however, are neither transparently available in the audiovisual signal nor deterministically fixed by the physiological and perceptual capacities of the species. Therefore, we need several age-appropriate models of how the lexicon can influence a child's interactions with the ambient language over the course of phonological acquisition.     

A CASE STUDY IN THE EXAMINATION OF SYSTEMS ANALYSIS Robert

This article describes an approach to the teaching and examining of systems analysis as a final year and MSc subject in a university department of computing mathematics.

One of the chief functions, if not the chief function of our University, is to prepare young Men — partly by the personal influence of those who have charge of them, and partly by the influence they exercise on one another — for the business of life.

(This needs to be specially borne in mind in connection with the assumption, so constantly made in this controversy, that the sole meaning of the BA Degree is that it guarantees the possession of a large amount of knowledge.)

Charles L. Dodgson Christ Church College Oxford 7 March 1896(1)

     

Exercise does not necessarily influence the phase of the circadian rhythm in temperature in healthy humans

Seventeen healthy adults exercised for 30 min (70% VO2max), at different times of the day and night throughout a 24 h period. The effect on the phase of core temperature rhythm was assessed by comparing the rhythms on the day immediately before and immediately after the day of exercise with the participants living normally on these 2 days. Assessments were made upon data that had been corrected for the thermogenic effects of sleep and activity. When exercise was performed in the period between 4 h before and 1 h after the temperature minimum, there was a phase delay of 1.03 +/- 0.78 h (mean +/- s; n = 6); when performed between 3 and 8 h after the temperature minimum, there was a phase advance of 1.07 +/- 1.23 h (n = 9). Both means were significantly different from zero (Student's one-sample t-tests: P < 0.05). Performed at other times, exercise had no significant effect on the phase of the temperature rhythm. The phase changes were not significantly different from those previously observed by us in sedentary individuals exposed to domestic lighting. We conclude that the amount of physical activity has very little effect on the body clock.     

A Typology of Parental Involvement in Education Centring on Children and Young People: Negotiating familialisation,institutionalisation and individualisation

This article explores the widespread emphasis on parental involvement in education from the perspectives of children and young people. In contrast to the conceptualisation of children as variable social actors, policy initiatives to link home and school more effectively, and research-generated typologies of parental involvement, unthinkingly familialise and institutionalise children by ignoring any part they may play in parental involvement in their education. Drawing on data from our study of children's understandings of home-school relations, we develop and elaborate a typology that centres on the complex ways that children and young people talk about creating, acceding to, and resisting their parents' involvement in their education. The socially patterned differences between the children and young people's understandings and experiences demonstrate how the broad social processes of familialisation, institutionalisation and individualisation are, in fact, concretely lived and negotiated in variable ways. Nevertheless, there are also some commonalities in children and young people's resistance around notions of privacy.     

Rising from the ashes: how the global education policy of community-based management was born from El Salvador's civil war

This paper explores the relationship between the emergence of global education policies and conflict-affected contexts by analysing the trajectory of community-level education decentralization within and beyond El Salvador from the 1980s, during the country's civil war, to the 2000s, by which point this approach to education governance was being widely promoted and adapted around the world. The findings – based on two years of data collection – demonstrate not only the way these contexts can be particularly susceptible to intervention by foreign governments and international organizations but also how, in certain historical-structural moments, those contexts can be transformed and leveraged to experiment with and to entrench certain policies.     

‘Technological me’: young children’s use of technology across their home and school contexts

Research into children’s learning with digital technologies is represented by a growing body of literature examining the relationship between home–school technological practices. A focus of this work is on the notion of a ‘digital-disconnect’ between home and school. This argument suggests that children are such native users of technologies they struggle to connect with commonly used technologies in school. This paper examines how the ‘digital-disconnect’ is experienced in children’s lives. Drawing on a data set investigating the digital experiences of 12 children aged 2–12 years, we consider the experiences of one family attending the same school. Three siblings aged 5–12 years recorded their home and school technology use for one week. The findings suggested some difference in use across both settings, but also similarities associated with information retrieval, rote learning and entertainment. We use Bulfin and North’s and Dyson’s ideas about the permeability of social boundaries to explain why technology use might be more similar than disconnected in each context. We consider the extent to which each setting influences the other as the basis for moving away from binary conceptualisations of the digital-disconnect informed by generational assumptions about children and technologies.