小学生写作态度与写作成绩关系研究

采用"小学生写作态度量表(自编)"与<小学生作文六项评定量表>,对小学生写作态度与写作成绩及其关系进行研究.结果表明,小学生写作态度的主要维度包括:认知、情感和意动;写作态度与写作成绩呈显著正相关,而情感因素是写作成绩的最重要的预测变量;在写作态度与成绩上存在性别、年级、写作水平的显著差异.     

小学儿童社会创造性与其同伴关系、学业成绩的关系

采用整群取样法, 选取387名小学儿童, 采用问卷法、同伴提名法和成绩评定, 考察了其社会创造性与其同伴关系、学业成绩的关系。结果表明:(1)小学儿童的社会创造性与学业成绩、社会喜好、社会影响, 学业成绩与社会喜好均呈显著正相关;(2)社会喜好在社会创造性与学业成绩之间、学业成绩在社会创造性与社会喜好之间、社会创造性在社会喜好与学业成绩之间均具有显著的中介效应, 社会影响在社会创造性对学业成绩的影响中具有显著的调节作用。     

糖尿病防治的策略转变——从关注糖化血红蛋白到着眼心血管事件

通过对2型糖尿病心血管终点事件的观察,更多的临床证据提示,糖尿病的治疗目标应该以减少心血管事件为主。糖尿病防治从策略上发生了两个转变,即以血糖为中心转向以防治心血管事件为中心的多危险因素综合防治策略;以糖化血红蛋白检测作为血糖评价的金标准转向以血糖量、质、时程控制的全面评价策略。     

复杂胫骨平台骨折处理的临床决策

复杂胫骨平台骨折处理相当困难,治疗上存在着一系列矛盾,准确的骨折分型和软组织损伤情况评估,合理的手术入路和手术时机选择,重视复位、固定方式和方法及软组织保护,双下肢同时消毒包扎为术中快速的体位转换提供了方便,一系列临床决策极大地提高了复杂胫骨平台骨折的治疗水平。     

A model of working memory capacity in the radial-arm maze task

The radial arm maze is one of the most commonly used tests for assessing working memory in laboratory animals. However, to date, there exists no quantitative method of estimating working memory capacity from performance on this task. Here, we present a mathematical model of performance on the radial arm maze from which we can derive estimates of capacity. We derive explicit results for the two most commonly used measures of performance as functions of number of arms in the maze and memory capacity, assuming a uniform random search. We simulate random non-uniform search strategies. Comparing our model to previous experiments, we show that our model predicts a working memory capacity in the range of 3-9 at the level of performance observed in these experiments. This estimate is within the typical estimate of human working memory capacity. Performance of rats on large mazes (e.g. 48 arms) has been used as evidence that the working memory capacity of rats may be significantly larger than that of humans. We report that memory capacity in the range 3-9 is sufficient to explain the performance of rats in very large radial mazes. Furthermore, when we simulate non-uniform random search strategies observed in the experiments, the resulting estimates do not differ significantly from those assuming a uniform random search. We conclude that a list-based model of working memory with modest capacity is more powerful than previously expected.     

Achievement strategies during university studies predict early career burnout and engagement

To examine whether individuals’ achievement strategies measured during university studies would have an impact on work burnout and work engagement measured 10, 14 and 17 years later, 292 university students completed the SAQ strategy questionnaire three times while at university, and the work burnout inventory three times and work engagement inventory twice during their early career. The results showed that optimism increased during university, while task-avoidance did not change. Moreover, high and increasing optimism during university predicted a high level of work engagement and low level of burnout 10, 14 and 17 years later. By contrast, a high level of task-avoidance during university predicted a low level of work engagement and high level of burnout during the early career.     

Understanding the relationship between posttraumatic stress disorder and trauma cognitions: The impact of thought control strategies

Several models of PTSD suggest that dysfunctional beliefs play an important role in the maintenance of PTSD. This study examined whether thought control strategies intermediated in the relationship between PTSD and dysfunctional cognitions. It was hypothesized that PTSD would be positively associated with dysfunctional cognitions and that negative thought control strategies (worry and self-punishment) would partially account for this relationship. These maladaptive strategies were predicted to be associated with increased levels of PTSD and more trauma-related beliefs. Additionally, it was predicted that positive thought control strategies (social control and reappraisal) would be associated with decreased levels of PTSD and fewer trauma-related beliefs. Finally, because the literature supports distraction as both an adaptive and a maladaptive thought control strategy, no a priori hypothesis was made. Results support worry and self-punishment as maladaptive intervening variables in the association between PTSD and dysfunctional cognitions, resulting in greater levels of PTSD and trauma cognitions. Social control and distraction emerged as adaptive strategies, resulting in lower levels of PTSD and trauma cognitions, while reappraisal showed no relationship with PTSD severity. Although the results are cross-sectional, continued focus on the effects of thought control strategies as meditational maintenance variables over time appears warranted.     

Large-Scale Assessment of Change in Student Achievement: Dutch Primary School Students’ Results on Written Division in 1997 and 2004 as an Example

This article discusses large-scale assessment of change in student achievement and takes the study by Hickendorff, Heiser, Van Putten, and Verhelst (2009) as an example. This study compared the achievement of students in the Netherlands in 1997 and 2004 on written division problems. Based on this comparison, they claim that there is a performance decline in this subdomain of mathematics, and that there is a move from applying the digit-based long division algorithm to a less accurate way of working without writing down anything. In our discussion of this study, we address methodological challenges that come in when investigating long-term trends in student achievements, such as the need for adequate operationalizations, the influence of the time of measurement and the necessity of the comparability of assessments, the effect of the assessment format, and the importance of inclusion relevant covariates in item response models. All these issues matter when assessing change in student achievement.     

Executive functions after age 5: Changes and correlates

Research and theorizing on executive function (EF) in childhood has been disproportionately focused on preschool age children. This review paper outlines the importance of examining EF throughout childhood, and even across the lifespan. First, examining EF in older children can address the question of whether EF is a unitary construct. The relations among the EF components, particularly as they are recruited for complex tasks, appear to change over the course of development. Second, much of the development of EF, especially working memory, shifting, and planning, occurs after age 5. Third, important applications of EF research concern the role of school-age children’s EF in various aspects of school performance, as well as social functioning and emotional control. Future research needs to examine a more complete developmental span, from early childhood through late adulthood, in order to address developmental issues adequately.     

Specialization effect and its influence on memory and problem solving in expert chess players

Expert chess players, specialized in different openings, recalled positions and solved problems within and outside their area of specialization. While their general expertise was at a similar level, players performed better with stimuli from their area of specialization. The effect of specialization on both recall and problem solving was strong enough to override general expertise—players remembering positions and solving problems from their area of specialization performed at around the level of players 1 standard deviation (SD) above them in general skill. Their problem-solving strategy also changed depending on whether the problem was within their area of specialization. When it was, they searched more in depth and less in breadth; with problems outside their area of specialization, the reverse. The knowledge that comes from familiarity with a problem area is more important than general purpose strategies in determining how an expert will tackle it. These results demonstrate the link in experts between problem solving and memory of specific experiences and indicate that the search for context-independent general purpose problem-solving strategies to teach to future experts is unlikely to be successful.