改良大脑真的好吗?     

ArthurL.Caplan柯江华  杨光 《科学中国》2003,(11):82-83

人类有能力测定和操纵基因,这一革命激起了各种各样的伦理争议.同样具有深远意义的脑科学革命,引起的注意却少得让人吃惊.  相似文献   

Enhancing Peer Interactions Within the Context of Play     

Michael Arthur  Sandra Bochner  Nancy Butterfield 《International Journal of Disability, Development & Education》1999,46(3):367-381

This paper provides a review of concepts and practices in the enhancement of peer relationships amongst young children in the context of play experiences, with particular emphasis upon the needs of individuals with developmental disabilities. We examine definitions and typical development patterns of social competence and a range of factors which influence it, including family issues. A set of best practice guidelines are then discussed in terms of the extant research literature, along with potential areas for future research in this field.  相似文献   

Outcomes of an Education and Exercise Program for Adults with Type 2 Diabetes,and Comorbidities that Limit their Mobility: A Preliminary Project Report     

Gina Pariser  Mary Ann DeMeuro  Patricia Gillette  Winters Stephen 《Cardiopulmonary Physical Therapy Journal》2010,21(2):5-12

Purpose: Some adults with type 2 diabetes mellitus (T2DM) have comorbidities and mobility impairments that limit their exercise capacity. In consideration of this, we developed and piloted a program called Active Steps for Diabetes for people with T2DM, comorbidities, and mobility impairments. The purpose of this paper was to report outcomes for the pilot program. Methods: Active Steps for Diabetes, an 8-week program, included instruction on diabetes self-care andgroup and home exercise programs. Twenty-two females (62.7 ± 6.1yrs) with T2DM and self-reported mobility impairments completed the program. Six participants used a walking aid. Outcome measures included two risk factors for coronary artery disease [daily physical activity and body mass index (BMI)], cardiovascular fitness (6-minute walk distance), and knowledge of diabetes-specific exercise guidelines. A two-way repeated measures ANOVA was used to compare outcomes before and after the program and between participants who did and did not use a walking aid. Results: Active Steps for Diabetes was effective in increasing daily physical activity in both groups of subjects (walking aid group: 2.6 days/week [95% confidence interval (CI) = 2.1 to 3.3]; no walking aid group: 1.9 days/week [95% CI=1.2 to 2.5]). This was accompanied by increases in 6-minute walk distances (walking aid group: 54.0 m [95% CI = 36.4 to 71.6]; no walking aid group: 62.6 m [95% CI=55.7 to 69.4]). Changes in BMI were not significant (walking aid group: −0.4 [95% CI = −1.2 to 0.4]; no walking aid group: −.24[95% CI = −.91 to .44]). Increases in knowledge of diabetes-specific exercise guidelines were observed in both groups (walking aid group: 18.8% [95% CI = 11.3 to 26.4]; no walking aid group: 19.3% [95% CI = 16.1 to 22.5]). Discussion:: Physical inactivity and low cardiovascular fitness are predictors of CAD morbidity and mortality in adults with T2DM. This pilot program suggests that a model for diabetes education, incorporating exercise programs developed by a physical therapist, may increase physical activity, improve endurance, and thereby potentially reduce CAD risk in people with T2DM and mobility impairments from comorbidities.Key Words: type 2 diabetes, physical activity  相似文献   

Necessary Educational Reform for the 2lst Century: The Future of Public Schools in our Democracy     

Armando Laguardia  Arthur Pearl 《The Urban Review》2009,41(4):352-368

We offer a theoretical and ecological argument for the preparation of citizens in U.S. public schools. This democratic education draws legitimacy from the concern of the nations founders for a populace educated to govern itself. We also emphasize the need for new democratic skills and knowledge in the face of today’s challenges, and our responsibility to prepare the young for the 21st century. A critique of the current school reform movement is provided because of its undemocratic nature. We issue a call for the transformation to democratic schools. We specifically argue that current efforts at reform are maintaining historical inequities, while also depriving those that enjoy social and economic advantages of the education needed to meet the challenges of a rapidly changing world. The democratic education proposed is based on three goals: citizenship preparation, inclusion, and an optimum learning environment. Seven well established principles of democracy and their relationship to schooling are presented. These include; the nature of authority, inclusiveness, equal availability of the understanding required for deliberating the most serious challenges to democracy and livability, equal access to centers of political decision-making, guaranteed inalienable rights, equality, and universal access to an optimum learning environment. We offer a fundamentally different approach to educational reform: calling for a reassessment of the role of public schools in a democracy that recognizes the importance of citizenship preparation, and a “bottom up” reform model that starts in the classroom and can be implemented by individual teachers.  相似文献   

Communication,language and literacy from birth to five     

Leonie Arthur 《Early Years: An International Journal of Research and Development》2010,30(3):280-282

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Recognizing the Outliers: Behaviors and Tendencies of the Profoundly Gifted Learner in Mixed-Ability Classrooms     

Robert Arthur Schultz 《Roeper Review》2018,40(3):191-196

This article focuses on (a) distinctions between the profoundly gifted individual and others, and (b) a chart describing tendencies and/or behaviors associated with the profoundly gifted student in common, mixed-ability educational settings. The intent is to provide educators, parents, and policymakers with preliminary awareness about the unique behaviors and tendencies of the profoundly gifted learner in heterogeneous educational settings. Learners with measured IQ scores greater than 3 SD units above the mean are a statistical rarity—outliers—in most educational settings. The current inability of most educators to identify and even minimally address needs leaves these students anxious, frustrated, and otherwise unable to reach their intellectual capacity in the majority of school settings across the country. Focused research and careful attention to the nature and needs of these individuals throughout their lives can contribute substantially to our developing understanding.  相似文献   

Editorial for EAIT Issue 2, 2018     

Arthur Tatnall 《Education and Information Technologies》2018,23(2):599-604

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Book reviews     

Peter Tothill  Arthur D. Stewart 《Journal of sports sciences》2013,31(7):563-565

Thigh muscle volume is a useful determinant of functional fitness. However, anthropometric prediction of muscle content is influenced by the variability of adipose tissue accumulation. The aims of this study were to predict thigh muscle and adipose tissue volumes from anthropometry and to assess the validity of the method by examining the various components of the measurements and the assumptions involved. The 19 participants (9 men, 10 women; age 23-49 years) varied in adiposity. They all underwent magnetic resonance imaging (MRI) of the upper leg and the eight men and two women with the lowest adiposity underwent detailed anthropometry involving girths and skinfolds. Using MRI as the reference method, muscle volume was predicted from anthropometry using a circular concentric model, and the assumptions inherent in the method were tested further using the MRI data alone. Muscle volume was best predicted by anthropometry in the 10 leanest participants using a five-slice truncated cone model that overestimated the mean MRI value by 30% ( R 2 = 0.95; standard error of estimate = 288 cm 3 ; P ? 0.001). A single skinfold plus girth measurement at the mid-thigh almost matched its predictive ability, but with an increased bias. Measurements of leg circumference by means of the two techniques agreed well. The assumption of a circular cross-section was valid. In contrast, the agreement between skinfold thickness measured by caliper and superficial adipose tissue thickness by MRI was poor, contributing to the scatter of fat and lean area comparisons. An anterior skinfold thickness measurement underestimated the area of superficial adipose tissue at that level, particularly at the most proximal and distal sites. Although these limitations increase the uncertainties of muscle volume determination by anthropometry, they do not prevent its valid prediction in leaner individuals. The prediction of superficial adipose tissue was poorer.  相似文献   

Time course of recovery of vertical jump height and heart rate versus running speed after a 90-km foot race     

Alan M Nevill  Roger L Holder  Arthur D Stewart 《Journal of sports sciences》2013,31(7):645-650

It is well known that sport and exercise play an important role in stimulating site-specific bone mineral density (BMD). However, what is less well understood is how these benefits dissipate throughout the body. Hence, the aim of the present study was to compare the BMD (recorded at nine sites throughout the skeleton) of 106 male athletes (from nine sports) with that of 15 male non-exercising age-matched controls. Given that BMD is known to increase with body mass and peak with age, multivariate and univariate analyses of covariance were performed to compare the BMD of the nine sports groups with controls (at all sites) using body mass and age as covariates. Our results confirmed a greater adjusted BMD in the arms of the upper-body athletes, the right arm of racket players and the legs of runners (compared with controls), supporting the site-specific nature (i.e. specific to the externally loaded site) of the bone remodelling response (all P?<0.01). However, evidence that bone mass acquisition is not just site-specific comes from the results of the rugby players, strength athletes, triathletes and racket players. The rugby players' adjusted BMD was the greatest of all sports groups and greater than controls at all nine sites (all P?<0.01), with differences ranging from 8% greater in the left arm to 21% in the lumbar spine. Similarly, the strength athletes' adjusted BMD was superior to that of controls at all sites (P?<0.05) except the legs. The adjusted BMD of the triathletes was significantly greater than that of the controls in both the arms and the legs as well as the thoracic and lumbar spine. The racket players not only had significantly greater right arm BMD compared with the controls but also a greater BMD of the lumbar spine, the pelvis and legs. In contrast, the low-strain, low-impact activities of keep-fit, cycling and rowing failed to benefit BMD compared with the age-matched controls. These results suggest that sporting activities involving high impact, physical contact and/or rotational forces or strains are likely to convey significant benefits not only to the loaded sites, but also to other unloaded peripheral and axial sites throughout the skeleton.  相似文献   

Childhood aerobic fitness predicts cognitive performance one year later     

Laura Chaddock  Charles H. Hillman  Matthew B. Pontifex  Christopher R. Johnson  Lauren B. Raine  Arthur F. Kramer 《Journal of sports sciences》2013,31(5):421-430

Abstract

Aerobically fit children outperform less fit peers on cognitive control challenges that involve inhibition, cognitive flexibility, and working memory. The aim of this study was to determine whether, compared with less fit children, more fit 9- and 10-year-old pre-adolescents exhibit superior performance on a modified compatible and incompatible flanker task of cognitive control at the initial time of fitness testing and approximately one year later. We found that more fit children demonstrated increased flanker accuracy at both test sessions, coupled with a superior ability to flexibly allocate strategies during task conditions that required different amounts of cognitive control, relative to less fit children. More fit children also gained a speed benefit at follow-up testing. Structural MRI data were also collected to investigate the relationship between basal ganglia volume and task performance. Bilateral putamen volumes of the dorsal striatum and globus pallidus volumes predicted flanker performance at initial and follow-up testing one year later. The present findings suggest that childhood aerobic fitness and basal ganglia volumes relate to cognitive control at the time of fitness testing and may play a role in cognitive performance in the future. We hope that this research will encourage public health and educational changes that will promote a physically active lifestyle in children.  相似文献