Learning outside the laboratory: Ability and non-ability influences on acquiring political knowledge

The purpose of this study was to identify sources of individual differences in knowledge acquired under natural conditions. Through its direct influence on background knowledge, crystallized intelligence (Gc) had a major impact on political knowledge, acquired over a period of more than 2 months, but there were independent influences of personality and interest factors, via exposure to political information through activities like reading the newspaper. We also found sex differences in political knowledge, favoring males, and these differences could not be explained in terms of any of the predictor variables we modeled. We discuss theoretical and practical implications of the results.     

Researching early intervention and young children's perspectives – developing and using a ‘listening to children approach’

This article, by Alice Paige‐Smith and Jonathan Rix, considers the current context of early intervention in England from the perspective and experiences of two families and in particular focuses on two young children identified as having Down syndrome. This case study research has emerged from previous research conducted by the authors, both of whom are Senior Lecturers at the Open University and have a wealth of experience across all phases of education. Their previous research involved interviews with parents of children diagnosed as having Down syndrome, which raised further questions about early intervention and the pedagogical relationship between the parent and the child, and recognised that ‘early intervention’ can be more than structured activities led by professionals. The research in this article, which has been funded by the British Academy, used ethnographic methodology to understand the process of early intervention with two young children with Down syndrome and their families. The methodology developed to include narrative first‐person observation of the child and photography. In addition to this a method of reflecting on the process of early intervention developed that included the researchers, the parent and the child. The development of this research methodology is considered in detail in this article.     

Resourced provision: the impact of inclusive practices on a mainstream primary school

This personal account from a special educational needs co‐ordinator illustrates the negative impact that resourced provision has had on one school. The provision caters for children with communication and interaction difficulties and is housed in a mainstream primary school. For this school, while the provision has had a beneficial impact on the development of inclusive values among pupils, it has also led to a decline in the overall effectiveness of the school. The achievement data of pupils in the provision has had a detrimental impact on overall school performance data. Current narrow measures of school effectiveness in England mean that schools with increasingly diverse student populations can pay the price for their commitment to inclusion, as this example illustrates.     

斯蒂芬霍金警告:不要和外星生物说话

斯蒂芬·霍金是本世纪享有国际盛誉的科学家,他现年68岁,是剑桥大学应用数学及理论物理学系教授,以及当代最重要的广义相对论和宇宙论家。他在1988年出版的著作《时间简史》,至今已销售逾2500万册,是全球最畅销的科普著作之一。霍金在最近发布了关于外星生物的纪录片,让我们一同来看看他的观点吧。     

Variable-cam resistance training machines: do they match the angle - torque relationship in humans?

The aim of this study was to determine the extent to which the resistance provided by variable-cam resistance training machines match joint torque capability. Eight variable-cam knee extension machines from six different manufacturers were assessed. Resistive torque for a constant weight/load was measured at five knee joint angles. Knee extensor muscle torque capability--the angle-torque relationship--of 10 healthy young men was determined isometrically and dynamically at the same five angles. After normalization, the two relationships were compared. The angle - torque relationship of the knee extensors displayed an inverted "U" shape as expected, with dynamic torque changing by +40% on the ascending limb (1.75 - 1.40 rad) and -60% on the descending limb (1.05-0.35 rad) of the angle - torque relationship. The angle-torque relationship of the different training machines was highly variable, but consistently less curvilinear and significantly different from knee extensor capabilities, with changes in torque of +2.5 to +22.2% (ascending limb) and +37.6 to -20.5% (descending limb). It is recommended that variable-cam resistance training machines be designed with the angle - torque relationship of the relevant joint and the inertial profile of the lifting exercise in mind.     

Reliability and validity of two tests of soccer skill

Twenty-four players from the 1st/2nd (elite) and 24 players from the 3rd/4th (non-elite) university football teams were recruited to evaluate the Loughborough Soccer Passing Test (LSPT) and Loughborough Soccer Shooting Test (LSST) as tools to assess soccer skill. The LSPT requires players to complete 16 passes as quickly as possible. The LSST requires players to pass, control, and shoot the ball to targets on a full-sized goal. Participants completed two main trials each separated by at least one day. During both trials, the participants were given practice efforts before recording the mean of the next two (LSPT) or 10 (LSST) attempts as the performance score. For the LSPT, the mean time taken, added penalty time, and overall performance time were less in the elite players (elite: 43.6 s, s = 3.8; non-elite: 52.5 s, s= 7.4; P= 0.0001). For the LSST, there was no difference in the mean points scored per shot between groups (elite: 1.34, s = 0.46; non-elite: 1.28, s = 0.53). However, the elite players had higher mean shot speed (elite: 80 km h(-1), s = 4.5; non-elite: 74 km h(-1), s = 4.2; P < 0.0001) and performed each shot sequence faster (elite: 7.87 s, s= 0.29; non-elite: 8.07 s, s= 0.35; P= 0.037) than the non-elite players. Performance on both tests was more repeatable in elite players. In conclusion, the LSPT and LSST are valid and reliable protocols to assess differences in soccer skill performance.     

The Role of Postural Support in Young Adults’ Control of Stationary Kicking

Purpose: The requirement for postural stability during the performance of motor skills has been clearly demonstrated in infants, but the necessity for such a postural substrate is not well documented in adults. The present study investigated the role of postural stability during a ballistic ball-kicking task in adults by providing varying degrees of external postural support. Method: In the 1st experiment, 30 participants performed 20 maximal-velocity kicks under each of 3 conditions: grasping a rigid stable handle, light fingertip touch, and grasping a suspended elastic tube. A 2nd experiment with 16 participants varied the position of the stable handle to examine if the handle position in Experiment 1 might simply act as a fulcrum to enhance torque generation. Results: In Experiment 1, ball velocity was significantly higher in the stable-grasp condition in both men and women with the men showing greater improvement relative to the other conditions. Experiment 2 showed that the position of the stable handle did not significantly affect kicking velocity, indicating that the handle was not simply acting as a fulcrum during the kick. Conclusion: Together, the findings suggest that postural stability may be a rate limiter in the performance of dynamic motor tasks in adults.     

Effect of environmental constraints on multi-segment coordination patterns during the tennis service in expert performers

The aims of this study were to examine the effect of different environmental constraints on kinematic multi-segment coordination patterns during the service and its coordination with service time variability. Ten expert tennis players (Age: 34.1 ± 5.3) volunteered to take part in this study. Participants served 30 times in 3 different conditions: control, target and opposition. The order of conditions was counterbalanced between participants. A wireless 3D motion capture system (STT Co, Spain) was used to measure 7 joint motions, with a 17 degrees of freedom biomechanical model created to capture the entire service action. Results of the principal component analysis showed that 4 synergies were created; however, their roles were changed relative to the perception of the environment. The results of repeated-measures analysis of variance did not show any significant difference on total variance and individual principal components between conditions; however, one synergy pattern significantly predicted the service time variability in both control and opposition conditions. In conclusion, the findings demonstrated that expert performers reduce the joint dimensionality by creating functional synergies in different phases of service and adapt the service action according to the perception of the environment.