The genetic and environmental covariation among psychopathic personality traits, and reactive and proactive aggression in childhood     

Bezdjian S  Tuvblad C  Raine A  Baker LA 《Child development》2011,82(4):1267-1281

The present study investigated the genetic and environmental covariance between psychopathic personality traits with reactive and proactive aggression in 9- to 10-year-old twins (N = 1,219). Psychopathic personality traits were assessed with the Child Psychopathy Scale (D. R. Lynam, 1997), while aggressive behaviors were assessed using the Reactive Proactive Questionnaire (A. Raine et al., 2006). Significant common genetic influences were found to be shared by psychopathic personality traits and aggressive behaviors using both caregiver (mainly mother) and child self-reports. Significant genetic and nonshared environmental influences specific to psychopathic personality traits and reactive and proactive aggression were also found, suggesting etiological independence among these phenotypes. Additionally, the genetic relation between psychopathic personality traits and aggression was significantly stronger for proactive than reactive aggression when using child self-reports.  相似文献   

Does generating examples aid proof production?     

Paola Iannone  Matthew Inglis  Juan Pablo Mejía-Ramos  Adrian Simpson  Keith Weber 《Educational Studies in Mathematics》2011,77(1):1-14

Many mathematics education researchers have suggested that asking learners to generate examples of mathematical concepts is an effective way of learning about novel concepts. To date, however, this suggestion has limited empirical support. We asked undergraduate students to study a novel concept by either tackling example generation tasks or reading worked solutions to these tasks. Contrary to suggestions in the literature, we found no advantage for the example generation group on subsequent proof production tasks. From a second study, we found that undergraduate students overwhelmingly adopt a trial and error approach to example generation and suggest that different example generation strategies may result in different learning gains. We conclude by arguing that the teaching strategy of example generation is not yet understood well enough to be a viable pedagogical recommendation.  相似文献   

Investigating geographic variation in use of psychotropic medications among youth in child welfare     

Leslie LK  Raghavan R  Hurley M  Zhang J  Landsverk J  Aarons G 《Child abuse & neglect》2011,35(5):333-342

Objectives

Public Law (P.L.) 110-351, the “Fostering Connections to Success Act,” calls for state child welfare agencies to partner with Medicaid and pediatric experts to provide planning and oversight regarding the provision of health and mental health services, including medication, to children in state custody. Recent reports, media cases, and class action lawsuits suggest over-use of psychotropic medications to address the behavioral needs of children in the child welfare system. We examined geographic variability in psychotropic medication use across US child welfare agency catchment areas to determine how rates of psychotropic medication use vary in relation to child, community, child welfare, and health system-level factors.

Methods

Cross-sectional analysis of Wave 1 data for the 92 child welfare catchment areas participating in the National Survey of Child and Adolescent Well-being, a random probability sample of 2,504 children ages 2-15 years undergoing investigation for abuse and neglect. We employed multilevel regression modeling to examine the impact of catchment-level variables on medication use, controlling for child-level variables.

Results

Fifteen percent of children reported taking psychotropic medications. Rates of medication use across catchment areas ranged widely from 0 to 40%, a 40-fold difference. On multi-level logistic regression modeling, older age (p < .001), male gender (p < .001), emotional and behavioral problems (p < .001), and insurance (p = .05) were associated with psychotropic medication use at the child-level. At the catchment-level, stressful environment within the child welfare system was negatively associated with medication use. No other catchment-level variables examined were found to explain use.

Conclusions

Striking disparities in medication use exist across catchment areas in this national sample. Of the catchment variables examined, only stressful environment was related to medication use.

Practice implications

These findings highlight significant geographic variation in medication use that most likely reflect both under-use and over-reliance on psychotropic medication. The link between child welfare environment and medication use suggests the influence of systemic, as opposed to clinical, causes of variation in medication use. This requires greater implementation of organizational processes governing quality of care for this highly vulnerable population.  相似文献   

Science and the major racket sports: a review   总被引：1，自引：1，他引：0  

Lees A 《Journal of sports sciences》2003,21(9):707-732

The major racket sports include badminton, squash, table tennis and tennis. The growth of sports science and the commercialization of racket sports in recent years have focused attention on improved performance and this has led to a more detailed study and understanding of all aspects of racket sports. The aim here, therefore, is to review recent developments of the application of science to racket sports. The scientific disciplines of sports physiology and nutrition, notational analysis, sports biomechanics, sports medicine, sports engineering, sports psychology and motor skills are briefly considered in turn. It is evident from these reviews that a great deal of scientific endeavour has been applied to racket sports, but this is variable across both the racket sports and the scientific disciplines. A scientific approach has helped to: implement training programmes to improve players' fitness; guide players in nutritional and psychological preparation for play; inform players of the strategy and tactics used by themselves and their opponents; provide insight into the technical performance of skills; understand the effect of equipment on play; and accelerate the recovery from racket-arm injuries. Racket sports have also posed a unique challenge to scientists and have provided vehicles for developing scientific methodology. Racket sports provide a good model for investigating the interplay between aerobic and anaerobic metabolism and the effect of nutrition, heat and fatigue on performance. They have driven the development of mathematical solutions for multi-segment interactions within the racket arm during the performance of shots, which have contributed to our understanding of the mechanisms of both performance and injury. They have provided a unique challenge to sports engineers in relation to equipment performance and interaction with the player. Racket sports have encouraged developments in notational analysis both in terms of analytical procedures and the conceptualization of strategy and tactics. Racket sports have provided a vehicle for investigating fast interceptive actions, hand-eye coordination and perception-action coupling in the field of motor control. In conclusion, science has contributed considerably to our knowledge and understanding of racket sports, and racket sports have contributed to science by providing unique challenges to researchers.  相似文献   

A three-dimensional kinematic analysis of the long jump take-off     

Graham-Smith P  Lees A 《Journal of sports sciences》2005,23(9):891-903

The long jump has been widely studied in recent years. Two models exist in the literature which define the relationship between selected variables that affect performance. Both models suggest that the critical phase of the long jump event is the touch-down to take-off phase, as it is in this phase that the necessary vertical velocity is generated. Many three dimensional studies of the long jump exist, but the only studies to have reported detailed data on this phase were two-dimensional in nature. In these, the poor relationships obtained between key variables and performance led to the suggestion that there may be some relevant information in data in the third dimension. The aims of this study were to conduct a three-dimensional analysis of the touch-down to take-off phase in the long jump and to explore the interrelationships between key variables. Fourteen male long jumpers were filmed using three-dimensional methods during the finals of the 1994 (n = 8) and 1995 (n = 6) UK National Championships. Various key variables for the long jump were used in a series of correlational and multiple regression analyses. The relationships between key variables when correlated directly one-to-one were generally poor. However, when analysed using a multiple regression approach, a series of variables was identified which supported the general principles outlined in the two models. These variables could be interpreted in terms of speed, technique and strength. We concluded that in the long jump, variables that are important to performance are interdependent and can only be identified by using appropriate statistical techniques. This has implications for a better understanding of the long jump event and it is likely that this finding can be generalized to other technical sports skills.  相似文献   

AN INTERVIEW WITH KIMMO LEHTONEN     

Michael F. Shaughnessy  Adrian Manz 《High Ability Studies》1991,2(2):228-235

In this interview, Dr. Kimmo Lehtonen discusses the current “state of the art” regarding creativity in Scandinavia, Europe, and around the world. He explores the training of teachers, prodigies, and art and music therapy. Dr. Lehtonen examines the issue of computers relative to creativity and various theoretical explanations for the phenomenon of creativity. Personality factors are examined and explored, and future concerns are delineated.  相似文献   

Student intrinsic motivation,science teaching practices and student learning     

Adrian Fordham 《Research in Science Education》1980,10(1):107-117

Conclusion This paper has been concerned with the application of basic understandings about intrinsic motivation and curiosity behaviour to the teaching of science, and in particular senior high school biology. The important role of student knowledge in the generation, maintenance and resolution of cognitive conflict is congruent with the renewed interest in studying students' everyday knowledge of curriculum content. However the study of classroom teaching processes in terms of their facilitation of intrinsic motivation is not common. Yet the data collected in this study demonstrates the importance of closely examining the implementation of courses such as the Web of Life, if the arousal of intrinsic motivation is an intended student outcome. Both interview and observational data indicated that the teaching styles adopted by teachers in this study were not likely to engender curiosity amongst students. Perhaps this should be expected. The use of a wide range of reference materials to investigate problems that arise in the classroom, the encouragement of students to do additional work on a topic if they are particularly interested, and a willingness on the part of the teacher to allow students sufficient time to formulate their own solutions to problems are classroom processes which necessitate a greater flexibility in curriculum presentation than can be often tolerated by teacher and school management. Such processes may be incompatible with organisational properties of the school and the pressures often placed upon students to perform to a high standard on rigidly defined examinations.  相似文献   

The effects of changing pace on metabolism and stroke characteristics during high-speed breaststroke swimming   总被引：1，自引：0，他引：1  

Thompson KG  MacLaren DP  Lees A  Atkinson G 《Journal of sports sciences》2004,22(2):149-157

Performances often vary between the heats and finals of breaststroke swimming competitions possibly because the swimmers try to conserve their energy, or for other tactical reasons. Additionally, coaches might advise either a 'positive' or 'even' pace race strategy during the final. The effect of such pacing changes on metabolism (blood lactate, heart rate, ventilation), ratings of perceived exertion, stroke kinematics and turning times have not been investigated. Nine male competitive breaststroke swimmers swam three paced (Aquapacer) 200-m trials, 48 h apart and in random order, at 98%, 100% and at an attempted 102% of their maximal 200-m time-trial speed. Responses in metabolic variables were similar between the 98% and 100% trials, but higher post-exercise blood lactate concentrations and respiratory exchange ratios were observed following the 102% trial. As the pace of trials increased, stroke rate was found to increase proportionately with stroke count. However, during the latter stages of the 100% trial, a disproportionate increase in the stroke count was observed, which led to a significant pacing error. This feature was more obvious in the 102% trial, where participants demonstrated 'positive pacing' and reported higher ratings of perceived exertion than for the 98% trial. During the early stages of the trials, turning times were initially shorter the faster the pace of the trial; however, as the trials progressed, this pattern was found to reverse. We conclude that a slight reduction in pace during near maximal breaststroke swimming altered kinematic but not post-exercise metabolic responses, while an increase in pace led to positive pacing and an increase in both kinematic responses and anaerobic metabolism.  相似文献   

Changing the way people think about health-enhancing physical activity: do mass media campaigns have a role?     

Cavill N  Bauman A 《Journal of sports sciences》2004,22(8):771-790

Mass media campaigns are conducted to influence community norms around health behaviours, including physical activity. Campaigns can reach large populations at relatively low cost, to influence awareness, knowledge and beliefs through to intention and behaviour change. We reviewed 15 campaigns with an explicit focus on physical activity, and explored impacts upon a range of proximal and distal variables. Campaigns achieved high recall, with a median of 70% of the target group aware of the campaign. Increases in knowledge or attitudes to physical activity were found among half the campaigns that reported this measure. Few campaigns reported other proximal variables, such as saliency, beliefs, self-efficacy or behavioural intention. Increases in physical activity were reported among motivated sub-groups of volunteers, but few campaigns reported population increases in activity. Campaigns increase awareness of the issue of physical activity but may not have a population-level effect on behaviour. Campaigns should focus more on influencing proximal variables, such as social norms, to bring about long-term behaviour change. This should be seen as part of a broader strategy, including policy and environmental change. Evaluation designs that measure the full range of variables are preferred to an over-concentration on behaviour alone.  相似文献   

A 5-star system for rating the quality of information based on DISCERN     

Shepperd S  Charnock D  Cook A 《Health information and libraries journal》2002,19(4):201-205

Objective: To develop an explicit scheme for calculating a 5‐star quality rating for consumer health information, and to test if there is good agreement be tween this and the final DISCERN quality question. Design: A sample of 15 consumers and health professionals rated 26 health information leaflets covering a broad range of conditions and treatments using two new 5‐star‐rating schemes and the existing DISCERN final quality rating. Each scheme is based on the 15 DISCERN criteria, but the 5‐star schemes provide more explicit methods for summarizing overall quality. The level of agreement between the three different rating systems was compared using Kappa scores with quadratic weights. Participants were also asked to complete a brief questionnaire that was designed to elicit their views on using a visual summary of the quality of health information. Results: The level of agreement between each 5‐star‐rating system and the existing DISCERN quality rating question was high (kappa = 0.86, 95% CI 0.83–0.89 in both instances). Seventy‐seven per cent of the sample preferred the second star‐rating scheme, and 80% reported they would use such a scheme. Conclusion: Assigning a single quality score using an explicit scoring scheme (represented by stars) based on answers to the DISCERN questionnaire is a reliable and valid way of rating consumer health information.  相似文献