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Diamond A  Lee EY 《Child development》2000,71(6):1477-1494
Infants of 5 to 6 months of age can retrieve a free-standing object, but fail to retrieve the same object from atop a slightly larger object. The accepted explanation has been that the infants do not understand that an object continues to exist independently when placed upon another. Predictions based on that explanation were tested against the hypothesis that infants' problem consists of lack of precision in visually guided reaching and lack of ability to inhibit reflexive reactions to touch. Twelve infants each at 5 and 7 months of age were tested on 16 trials. More 5-month-olds succeeded, in less time, and with fewer touches to an edge of the base, on trials more forgiving of an imprecise reach than on less forgiving trials. Success in retrieving objects close in size and fully contiguous with their bases was seen even at 5 months when the demands on skill in reaching were reduced. It is proposed that when 5-month-old infants fail to retrieve one object placed upon another, it is not because of a lack of conceptual understanding, but because they lack the skill to reach to the top object without accidentally touching an edge of the base en route.  相似文献   
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Gender variance confronts widely held assumptions that children born as males will act like ‘boys’ and children born as females will act like ‘girls’. This imposed binary has the effect of perpetuating negativity towards people who express themselves with gendered variations in attire, behaviour or preferences. Despite the existence of gender-variant individuals in every culture and throughout time, many people are unaware that diversity in gender expression and sexual formation is a naturally occurring phenomenon. This qualitative study aimed to establish the needs of gender-variant children and their parents in order to inform education programmes, policies and clinical approaches to gender variance. Three Internet surveys were conducted to explore the experiences of parents raising gender-variant children, the childhood experiences of transgender adults and the views of professionals who work with the transgender community. The needs of gender-variant children emerged in terms of the need for information, peer contact, personal gender expression, safety, and to be heard and accepted by their parents. The most common needs for parents were for information (stories from other parents, research and guidelines; peer support) and educational resources for schools, professionals and local communities. The paper provides comparisons between the three participant groups and recommendations for future research.  相似文献   
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Much continues to be written about the failure of U.S. schools to provide a quality education for at-risk urban students. Private Nativity model schools have been instituted in response to the need to provide quality education at the middle school level for such students. As the number of these and other alternative middle schools increases, a thorough examination of the strengths and weaknesses of the model is needed. This study provides such a multimethod examination of 9 such schools. Analyses of students' self-perceptions, perceptions of the quality of the climate at their schools, and academic performance, as well as classroom observations, interviews with teachers, administrators, and students are provided. Results suggest that the success of the Nativity model rests primarily with: (a) a strong and committed teaching staff, (b) an extended school day in which students receive homework assistance and tutoring, (c) small class sizes and student-teacher ratios that afford considerable individual attention from teachers, and (d) a supportive peer environment.  相似文献   
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The transgenic mouse model is useful for studying the causes and potential cures for human genetic diseases. Exposing high school biology students to laboratory experience in developing transgenic animal models is logistically prohibitive. Computer-based simulation, however, offers this potential in addition to advantages of fidelity and reach. This study describes and evaluates a computer-based simulation to train advanced placement high school science students in laboratory protocols, a transgenic mouse model was produced. A simulation module on preparing a gene construct in the molecular biology lab was evaluated using a randomized clinical control design with advanced placement high school biology students in Mercedes, Texas (n?=?44). Pre-post tests assessed procedural and declarative knowledge, time on task, attitudes toward computers for learning and towards science careers. Students who used the simulation increased their procedural and declarative knowledge regarding molecular biology compared to those in the control condition (both p?<?0.005). Significant increases continued to occur with additional use of the simulation (p?<?0.001). Students in the treatment group became more positive toward using computers for learning (p?<?0.001). The simulation did not significantly affect attitudes toward science in general. Computer simulation of complex transgenic protocols have potential to provide a ??virtual?? laboratory experience as an adjunct to conventional educational approaches.  相似文献   
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Understanding children's decisions to include a child with a disability in activities is an important component of the social environment of children with disabilities. We examined preschool children's understanding of the motor and social competence of hypothetical children with a physical disability, children's decisions to include or exclude a peer with a physical disability in play activities, and children's justifications of their inclusion/exclusion decisions. Children understood that a peer with a physical disability would have more difficulty with activities requiring motor skills than social skills and were more likely to include a peer with a physical disability when the activities required minimal motor skills. The role of typically developing children's understanding of social contexts in peer relationships is discussed.  相似文献   
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Classroom level data driven decision-making (DDDM) involves the use of data to identify patterns of performance that reveal students’ academic strengths and weaknesses relative to established learning goals, and the planning of instructional practices to support academic success for all students. Although DDDM is not a new paradigm in education, little is known about what variables facilitate teacher adoption of DDDM practices. The aim of this work was to introduce two such variables, DDDM efficacy and DDDM anxiety, and a measure of these constructs, the DDDM efficacy and anxiety (3D-MEA) inventory. The 1728 participants in this study were K-12 teachers who had experienced varying levels of DDDM professional development in a Pacific Northwestern state. Exploratory factor analysis (EFA) (n = 864) and confirmatory factor analysis (CFA) (n = 864) were utilized to evaluate the psychometric properties of the 3D-MEA Inventory. Results supported a five-factor model. A discussion of the results and their implications ensue.  相似文献   
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Abstract

The development of the Children's Attitudes Toward the Environment Scale-Preschool Version (CATES-PV) is reported. The scale was administered to 42 preschool children. Their parents (34 mothers, 30 fathers) completed 2 environmental attitude scales, an environmental knowledge scale, and a questionnaire concerning environmentally related home practices. The scale has acceptable reliability, with a Cronbach's alpha of .68. Construct validity of the scale was suggested by the pattern of relationships found between child and parent measures. Specifically, children's attitudes were not correlated with verbal ability, but with the degree to which children participated in environmentally relevant activities in the home. The implications of those results for preschool curricula and practices are discussed.  相似文献   
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