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One influential explanation of the development of verbal short-term memory in children argues that short-term memory capacity is a direct function of speech rate. This theory predicts that children with pathologically slow speech will show reduced verbal short-term memory capacity and will show less evidence of speech-base coding on verbal memory tasks. To test this prediction, verbal short-term memory span was assessed using a task that did not require a verbal response in 37 speech-disordered children and 37 age- and sex-matched controls (age range 4-15 years). The speech-disordered group had a significantly lower short-term memory capacity, a smaller word length effect, and reduced speech-motor activity during rehearsal periods. Covariance analyses revealed that these differences were not a function of general intellectual or motor speed differences between the groups, and that speech rate as a covariate abolished group differences in short-term memory. These results suggest that speech rate may be a causal determinant of verbal short-term memory capacity. 相似文献
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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
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In recent years, universities have appointed an increasing number of ‘teaching-only’ or ‘teaching-dominant’ staff. While the balance of reward and recognition between teaching and research has been extensively considered for staff engaged in both, this is the first attempt to look at the situation of staff appointed on teaching–only contracts. Our survey reveals an enthusiastic workforce, which nevertheless feels undervalued by the system. This is an important issue for the development of higher education. 相似文献
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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
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This study takes an interdisciplinary approach to answering the questions of whether and how the intellectual capital (IC) of a company is related to its financial structure. To this end, we consecutively apply factor and regression analyses on a sample of 65 small and medium-sized Finnish biotechnology companies. Based on the results, we find that firms with a well-balanced IC base finance their operations to a larger extent with retained earnings and debt while companies with less well-balanced IC bases revert to other sources of financing, for example, external equity. Utilizing the conventional pecking order theory as a theoretical backdrop on one hand and recent results from its empirical research on the other, we present two alternative rationales behind deviating capital structure choices made by companies with dissimilar IC bases. 相似文献
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Payson Library, the largest library at Pepperdine, primarily serves undergraduate students. It underwent a renovation between spring 2016 and fall 2017. Payson Library was closed during this renovation, and a Library Hub was established as a temporary service point and library information and teaching center on campus. Maintaining market share led to rolling out new services such as RAPID-ILL, repurposing a graduate campus library for increased study spaces, and reliance on a strong library liaison program. Predictably, there was a sharp reduction in patron visits, but there was success in providing reference, instruction, and access to the collections. 相似文献
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Chaddock L Hillman CH Pontifex MB Johnson CR Raine LB Kramer AF 《Journal of sports sciences》2012,30(5):421-430
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
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Gary Raine 《牛津教育评论》2013,39(2):211-231
The commercialisation of schools is a controversial issue, but very little is known about the actual situation in UK schools. The aim of this study was to investigate, with particular reference to health education and health promotion, commercial activities and their regulation in primary schools in the Yorkshire and Humber region of the UK. A questionnaire was sent to a random sample of 650 headteachers with respondents being asked whether a range of commercial activities had been present in their school during the previous 20 months. They also indicated whether the school had any policies on the types of activity covered by the questionnaire. The results showed that four types of commercial activity had been present in over 50% of responding schools. These were voucher/token collection schemes, business linked competitions/contests, business linked sports coaching and sponsorship. Voucher/token collection schemes were found to be the most common form of activity, with 85% of schools having participated in at least one of these initiatives. Only 4% of schools had any policies on the types of activity covered in the questionnaire. Further research in the UK on commercial activities in schools is recommended. 相似文献