The Transition to Reaching: Mapping Intention and Intrinsic Dynamics   总被引：9，自引：0，他引：9  

Esther Thelen  Daniela Corbetta  Kathi Kamm  John P. Spencer  Klaus Schneider  Ronald F. Zernicke 《Child development》1993,64(4):1058-1098

The onset of directed reaching demarks the emergence of a qualitatively new skill. In this study we asked how intentional reaching arises from infants' ongoing, intrinsic movement dynamics, and how first reaches become successively adapted to the task. We observed 4 infants weekly in a standard reaching task and identified the week of first arm-extended reach, and the 2 weeks before and after onset. The infants first reached at ages ranging from 12 to 22 weeks, and they used different strategies to get the toy. 2 infants, whose spontaneous movements were large and vigorous, damped down their fast, forceful movements. The 2 quieter infants generated faster and more energetic movements to lift their arms. The infants modulated reaches in task-appropriate ways in the weeks following onset. Reaching emerges when infants can intentionally adjust the force and compliance of the arm, often using muscle coactivation. These results suggest that the infant central nervous system does not contain programs that detail hand trajectory, joint coordination, and muscle activation patterns. Rather, these patterns are the consequences of the natural dynamics of the system and the active exploration of the match between those dynamics and the task.  相似文献   

Zoo educators face common and specific demands and resources: an application of the JD-R model     

Daniela Sellmann  Valerie Beckmann  Sarah Panzlaff  Susanne Menzel 《Environmental Education Research》2019,25(1):92-114

Zoo educators are important communicators of the targets in education for sustainable development and therefore carry great responsibility for global environmental change. However, German zoo educators form a heterogeneous group, many of them working in non-permanent job positions and facing multiple challenges at work. Applying the job demands-resources model, our study aims at revealing factors influencing zoo educators’ job strain. Our data from eight in-depth interviews with German zoo educators confirm that they perceive common factors known from other studies, such as demands (e.g. workload) and resources (e.g. supervisory support). Besides this, job-specific factors were identified (e.g. working with humans and animals). The demands zoo educators mentioned could be classified either as job hindrances (e.g. lack of equipment) or job challenges (e.g. learning). Future studies should quantify these results to facilitate the development of appropriate measures to reduce educators’ job strain, thus enhancing their performance.  相似文献   

Family Risk and Externalizing Problems in Chilean Children: Mediation by Harsh Parenting and Emotional Support     

Elisa Ugarte  Marigen Narea  Daniela Aldoney  David G. Weissman  Paul D. Hastings 《Child development》2021,92(3):871-888

Latent class analysis and multigroup mediation were used with 8,860 families in Chile to identify risk groups varying in socioeconomic status, family structure, and maternal depression, to determine whether profiles differed in children’s development of externalizing problems (EP) from 35 to 61 months, and maternal parenting that predicted EP. Four groups were identified: one no-risk profile and three risk profiles, impoverished and undereducated, depressed and impoverished, and father-absent and impoverished. All classes differed in EP. Maternal emotional support and harsh parenting were differentially associated with the development of EP across the three risk groups, relative to the low-risk group. Thus, specific constellations of adversities differentially predicted children’s EP and socialization processes mediating links between risk and EP. Implications are discussed.  相似文献   

La géométrie projective à l'école     

Emma Castelnuovo  Daniela  Claudio Gori-Giorgi 《Educational Studies in Mathematics》1976,7(4):443-463

Sans résuméTravail effectué dans le cadre du groupe de recherche en didactique de la mathématique du Conseil National des Recherches.  相似文献   

Two-Year-Old Children's Sensitivity to a Parent's Knowledge State When Making Requests     

Daniela K. O'Neill 《Child development》1996,67(2):659-677

These studies examined whether toddlers take their communicative partners' knowledge states into account when communicating with them. In Study 1 , 16 2-year-old children (mean age 2-7) had to ask a parent for help in retrieving a toy. On each trial, a child was first introduced to a new toy that was then placed in 1 of 2 containers on a high shelf. The parent either witnessed these events along with the child or did not because she or he had left the room or had covered her or his eyes and ears. As predicted, when asking for help in retrieving the toy, children significantly more often named the toy, named its location, and gestured to its location when a parent had not witnessed these events than when she or he had. In Study 2, 16 2-year-old children (mean age 2-3) had to ask a parent for help in retrieving a sticker dropped into 1 of 2 identical containers placed out of reach in the far corners of a table. The parent either witnessed, along with the child, which container the sticker was dropped into or did not because her or his eyes were closed. In their requests for help, young 2-year-old children gestured to the sticker's location significantly more often when the parent did not know its location than when she or he did. The implications of these findings for current characterizations of 2-year-old children's ability to assess the knowledge of others is discussed.  相似文献   

Training transfer between card sorting and false belief understanding: helping children apply conflicting descriptions   总被引：2，自引：0，他引：2  

Kloo D  Perner J 《Child development》2003,74(6):1823-1839

  相似文献   

Arithmetic education and learning disabilities in Italy     

Cornoldi C  Lucangeli D 《Journal of learning disabilities》2004,37(1):42-49

In the first part of this article, we briefly present the context of mathematics education in Italy and its specific programs, teaching and assessment methods, use of psychological concepts, and policies in favor of pupils with difficulties. We illustrate the importance and the role of mathematics teachers' associations. In the second part, we focus more directly on the issue of arithmetic learning and learning disabilities in Italy. Despite the absence of a specific strong tradition in the field, new perspectives regarding mathematics education are evident in Italy. The preparation of new assessment tools has proceeded together with an effort toward the identification of subtypes of arithmetic learning disabilities. A basic distinction has been made between difficulties in number processing/calculation and problem-solving tasks. Within the area of calculation, a finer distinction between numerical knowledge, speed, and accuracy seems critical, but a more articulated differentiation of subcomponents relying on modern cognitive-neuropsychological models can be used also.  相似文献   

Preschool children’s conceptions of water,molecule, and chemistry before and after participating in a playfully dramatized early childhood education activity     

Åkerblom  Annika  Součková  Daniela  Pramling  Niklas 《Cultural Studies of Science Education》2019,14(4):879-895

The present study reports an empirical investigation into concept formation of young children. Based on interviews conducted before and after participating in a playfully enacted chemistry lesson at a culture center, it is analyzed how 6-year-old children conceptualize water, molecule, and chemistry. Theoretically, the study is informed by Vygotsky’s cultural-historical perspective on concept formation. The empirical data consist of pre- and post-interviews with children and documentation of their participation in the intermediate activity. This documentation is used in the post-interviews as a mutual ground for talking with the children about what they remember and how they understand the activity they participated in and what the activity intended to illustrate. The results are presented in terms of three inductively generated categories: ‘everyday’, ‘experientially-based’, and ‘generalized experiences’ concepts, respectively. The implications of these findings for early childhood chemistry (science) education are discussed.

  相似文献   

Reporting Mobile Social Media Use: How Survey and Experience Sampling Measures Differ     

Teresa K. Naab  Veronika Karnowski  Daniela Schlütz 《Communication methods and measures》2019,13(2):126-147

Quantifying the ubiquitous, ephemeral, and highly diverse patterns of mobile social media (MSM) use is a challenge for communication research. Most researchers employ retrospective survey measurement, thus depending on the accuracy of users’ memories and generalizations. Alternatively, some researchers rely on in-situ measurement, being less dependent on users’ memories and generalizations, but requiring random situation samples. To assess differences and similarities between these two measurement approaches we analyzed whether characteristics (duration and frequency of a usage episode, habit, elaboration, and gratifications) of MSM use (regarding Facebook, WhatsApp, and YouTube) vary between retrospective survey and mobile experience sampling measurement. We observe a consistent pattern of higher estimates in retrospect as compared to individual averages of in-situ reports. The absolute magnitude of these differences varies considerably between platforms and characteristics studied. Nonetheless, for most constructs and platforms we find low significant positive correlations between retrospective and aggregated in-situ values.  相似文献   

Community Networks: Rules of Behavior and Social Structure     

Fiorella De Cindio  Oliverio Gentile  Philip Grew  Daniela Redolfi 《The Information Society》2003,19(5):395-406

This article investigates the intertwining relationships between the Gemeinschaft and the Gesellschaft dimension of a community network (CN)—that is, of a virtual community whose members' common interest is a locality, in our case the city of Milan, Italy. The article looks through the experience of the last 7 years of life on RCM—the Milan Community Network—to reflect on the role that the sharing of rules of behavior has on the evolution of social structure in a virtual community. It identifies three phases of development—the design phase, the first growth phase, and the most recent phase—and presents the social structure set up to guarantee governance of the CN. The conclusions show that the third phase is not an actual stable state, as the continuous evolution of the societal and technological context requires continuous redesign of the CN itself in order to meet the renewed demands of a new context.  相似文献