共查询到20条相似文献，搜索用时 31 毫秒
1.
以Lorenz系统为例,提出一种新的耦合方法,发现驱动-响应系统中正反相同步同时存在.通过计算其最大横向李雅普诺夫指数,分析同步平面的稳定性,找出其同步范围,并通过仿真实验进行验证. 相似文献
2.
A developmental pathway is proposed for toddlers' mastery of the skills involved in generating non-ritualized forms of cooperative coordinated action with peers and the studies of USA toddlers supporting this pathway reviewed. The proposed pathway posits (a) a central role for nonverbal imitative acts in enabling toddlers to generate together extended bouts of nonverbal coordinated action and (b) a central role for these bouts of imitative coordinated action in facilitating toddlers' development of verbal means of coordinating action. This pathway then guides an analysis of the development and functions of imitative acts among toddler peers from a quite different cultural context-the Seltaman people of Papua New Guinea. Twelve Seltaman toddlers were observed with peers at near-weekly intervals over a six-month period. Ready imitation of one another emerged among the Seltaman toddlers during the same developmental period as for USA toddlers and functioned similarly to generate extended bouts of coordinated action-reciprocal imitation games. The themes of the reciprocal imitation games, however, varied in line with the socialization practices and characteristic play settings of the two cultures. These findings provide further support for the proposition that these imitative acts form part of a distinctly human pathway of development related to the emergence of human language. 相似文献
3.
Theodore D. Wachs Zeinab Bishry Afaf Sobhy George McCabe Osman Galal Farouk Shaheen 《Child development》1993,64(2):586-604
2 questions were explored: (1) Do observed relations found in Western cultures between specific psychosocial environmental factors and toddlers adaptive behavior resemble the pattern of relations found in a non-Western setting? (2) Does the specificity of relations between environment and performance found in Western cultures also operate in a non-Western culture? Subjects were 153 Egyptian toddlers, 18–30 months of age, and their caregivers. Twice a month between 18 and 30 months toddlers were observed in naturalistic interactions with their caregivers, and measures of caregiver behavior and toddler functioning were coded. Replicating previous results from Western cultures, canonical analysis indicated that caregiver vocal stimulation was positively related to indices of toddler behavioral competence, while nonverbal response to vocalization and physical contact stimulation were negatively related. The salience of sib caregivers was also noted. Particularly for the age period between 24 and 29 months, results indicated specificity of environmental action such that measures of caregiver vocal stimulation were uniquely related to measures of toddler vocalization, while caregiver response to distress was uniquely related to toddler emotionality. The present pattern of results suggests at least some degree of cross-cultural generalizability of environment-development relations and of the specificity model of environmental action. 相似文献
4.
Paweł Fritzkowski Roman Starosta Grażyna Sypniewska-Kamińska Jan Awrejcewicz 《浙江大学学报(A卷英文版)》2017,18(7):497-510
A 1D chain of coupled oscillators is considered, including the Duffing-type nonlinearity, viscous damping, and kinematic harmonic excitation. The equations of motion are presented in a non-dimensional form. The approximate equations for the vibrational amplitudes and phases are derived by means of the classical averaging method. A simple analysis of the resulting equations allows one to determine the conditions for the two basic synchronous steady-states of the system: the in-phase and anti-phase motions. The relations between the required excitation frequency and the natural frequencies of the abbreviated (linear) system are discussed. The validity of these predictions is examined by a series of numerical experiments. The effect of the model parameters on the rate of synchronization is analyzed. For the purpose of systematic numerical studies, the cross-correlation of time-series is used as a measure of the phase adjustment between particular oscillators. Finally, some essential issues that arise in case of the mechanical system with dry friction are indicated. 相似文献
5.
This study developed a gesture-based learning approach to build a virtual interactive learning environment for preschoolers by combining a gesture-based computing device and a game-based learning model. Using sequential analysis, this study investigated how this approach influenced children’s learning performance, motor skills, and motion behaviors. A quasi-experiment was conducted with 142 kindergarten-level-3 preschoolers. The results showed that the gesture-based learning approach improved the students’ learning performance and motor skills compared with the traditional activity-based learning approach. The main learning pattern showed that the preschoolers controlled their body motion behaviors and movements to learning cognitive knowledge, which achieving a flow state that improved preschoolers’ learning performance and motor skills. In addition, the main motion pattern showed that the preschoolers interacted with the game by coordinating their body movement with the projected human skeleton’s movement, which improved their motor skills. 相似文献
6.
This study examines the development of hammering within an ontogenetic and evolutionary framework using motion‐capture technology. Twenty‐four right‐handed toddlers (19–35 months) wore reflective markers while hammering a peg into a peg‐board. The study focuses on the motor characteristics that make tool use uniquely human: wrist involvement, lateralization, and handle use. Older children showed more distally controlled movements, characterized by relatively more reliance on the wrist, but only when hammering with their right hand. Greater age, use of the right hand, and more wrist involvement were associated with higher accuracy; handle use did not systematically change with age. Collectively, the results provide new insights about the emergence of hammering in young children and when hammering begins to manifest distinctively human characteristics. 相似文献
7.
The present article shows that infant and dyad differences in hand–eye coordination predict dyad differences in joint attention (JA). In the study reported here, 51 toddlers ranging in age from 11 to 24 months and their parents wore head‐mounted eye trackers as they played with objects together. We found that physically active toddlers aligned their looking behavior with their parent and achieved a substantial proportion of time spent jointly attending to the same object. However, JA did not arise through gaze following but rather through the coordination of gaze with manual actions on objects as both infants and parents attended to their partner's object manipulations. Moreover, dyad differences in JA were associated with dyad differences in hand following. 相似文献
8.
Children with developmental coordination disorder (DCD) experience difficulty coping with everyday demands due to difficulties
in performing motor tasks. Recently, a cognitive learning paradigm has been applied to studying the nature of the problems
experienced by children with DCD, which assumes that these children have fewer cognitive and metacognitive skills with which
to acquire motor skills. However, despite the emergence of such cognitive models, individual differences in children’s use
of self-regulatory and metacognitive skill during motor learning have received little research attention. The aim of this
review article was to examine the roots of this emerging field of research, locate it within the larger body of metacognitive
and self-regulation literature, and examine some of the preliminary work that has been conducted on the role of self-regulation
and metacognition in motor learning and in the motor performance difficulties of children with DCD. 相似文献
9.
This article concerns the purpose, function, and mechanisms of students’ rhythmic behaviors as they solve embodied-interaction problems, specifically problems that require assimilating quantitative information structures embedded into the environment. Analyzing multimodal data of one student tackling a bimanual interaction design for proportion, we observed the (1) evolution of coordinated movements with stable temporal–spatial qualities; (2) breakdown of this proto-rhythmic form when it failed to generalize across the problem space; (3) utilization of available resources to obtain greater specificity by way of measuring spatial spans of movements; (4) determination of an arithmetic pattern governing the sequence of spatial spans; and (5) creation of a meta-rhythmic form that reconciles continuous movement with the arithmetic pattern. The latter reconciliation selectively retired, modified, and recombined features of her previous form. Rhythmic enactment, even where it is not functionally imperative, appears to constitute a tacit adaptation goal. Its breakdown reveals latent phenomenal properties of the environment, creating opportunities for quantitative reasoning, ultimately supporting the learning of curricular content. 相似文献
10.
This study was designed to provide a general picture of infant vocal-motor coordination and test predictions generated by Iverson and Thelen's (1999) model of the development of the gesture-speech system. Forty-seven 6- to 9-month-old infants were videotaped with a primary caregiver during rattle and toy play. Results indicated an age-related increase in frequency of vocal-motor coordination, greater coordination with arm (specifically right arm) than leg or torso movements, and a temporal pattern similar to that in adult gesture-speech coproductions. Rhythmic vocalizations (consonant-vowel repetitions) were more likely to occur with than without rhythmic movement, and with rhythmic manual than with nonmanual activity, and the rate of vocal-manual coordination was higher in babblers than in prebabblers. 相似文献
11.
Solving Bernstein's Problem: A Proposal for the Development of Coordinated Movement by Selection 总被引：6，自引：0，他引：6
In recent years, many established concepts in the theory of human motor development have undergone profound change, and our knowledge has increased greatly. Nevertheless, some outstanding problems remain unsolved. A central problem concerns the redundancy of effective movements, first pointed out by N. A. Bernstein. The human motor system is mechanically complex and can make use of large number of degrees of freedom. The controlled operation of such a system requires a reduction of mechanical redundancy, effectively by reducing the number of degrees of freedom. More recent work has shown that this problem is hard to solve explicitly by computing solutions to the equations of motion of the system. Equally challenging to traditional computational approaches is the fact the motor systems show remarkable adaptability and flexibility in the presence of changing biomechanical properties of motor organs during development and when faced with different environmental conditions or tasks. Solutions to these problems would have a large impact on a variety of issues in child development. In this article, we stress the importance of the somatic selection of neuronal groups in maps for the progressive transformation of a primary movement repertoire into a set of motor synergies and adaptive action patterns. We present results from computer simulations of a simple motor system that works according to such selectional principles. This approach suggests a provisional solution to Bernstein's problem and provides new parameters to guide experimental approaches to the development of sensorimotor coordination. 相似文献
12.
Meagan R. Talbott Gregory S. Young Jeff Munson Annette Estes Laurie A. Vismara Sally J. Rogers 《Child development》2020,91(3):743-753
In typical development, gestures precede and predict language development. This study examines the developmental sequence of expressive communication and relations between specific gestural and language milestones in toddlers with autism spectrum disorder (ASD), who demonstrate marked difficulty with gesture production and language. Communication skills across five stages (gestures, word approximations, first words, gesture-word combinations, and two-word combinations) were assessed monthly by blind raters for toddlers with ASD participating in an randomized control trial of parent-mediated treatment (N = 42, 12–30 months). Findings revealed that toddlers acquired skills following a reliable (vs. idiosyncratic) sequence and the majority of toddlers combined gestures with words before combining words in speech, but in contrast to the pattern observed in typical development, a significant subset acquired pointing after first words. 相似文献
13.
Preschool and kindergarten teachers must make decisions everyday about how much to allow their children to talk out loud to themselves during various classroom activities. The present study examines the effects of children's private speech use on task performance for a group of behaviorally at-risk children and a group of control children during a speech–action coordination task. Twenty-nine behaviorally at-risk preschool children and 43 control children completed two versions of a speech–action coordination task (motor sequencing version and numeric tapping) two times, once with and once without speech instructions. Results indicated that the behaviorally at-risk children used more speech spontaneously compared to control children and performed just as well, and that both groups of children performed better when given instructions to use speech. Implications of these findings for early childhood educators’ decisions about children's private speech use in the classroom are discussed. 相似文献
14.
There is a robust association between prenatal smoking and disruptive behavior disorders, but little is known about the emergence of such behaviors in early development. The association of prenatal smoking and hypothesized behavioral precursors to disruptive behavior in toddlers (N=93) was tested. Exposed toddlers demonstrated atypical behavioral patterns, including (1) escalating externalizing problems from 18 to 24 months and (2) observed difficulty modulating behavior in response to social cues. Specification of exposure-related behaviors is a first step toward generating testable hypotheses about putative mechanisms of effect. While it remains unclear whether prenatal exposure plays an etiologic role in the emergence of disruptive behavior, atypical exposure-related behavioral patterns are evident in the first years of life and demonstrate developmental coherence. 相似文献
15.
Rev. William E. McLennan D. D. 《Religious education (Chicago, Ill.)》2013,108(3):267-271
Poetry is a bridge across diverse realities; it bridges the expressible and inexpressible, the present and future. Poetry is also a powerful force in human life; it reveals, nourishes, binds, critiques, empowers, constructs, and confronts. From such movements come visions for educational action, both actual and metaphoric. These include: dancing, meditating, singing, chanting, improvising, and drumming. 相似文献
16.
The process of development occurs according to the pattern established by the genetic potential and also by the influence
of environmental factors. The aim of the present study was to focus on the main environmental factors affecting motor development.
The review of the literature revealed that family features, such as socioeconomic status, mother’s educational level, and
the existence of siblings can affect children’s motor competence. Preschool centers have also become important for children’s
development, due to the large amount of time children spend at them nowadays. Moreover, the social cultural context in which
a child is reared forms certain demands for his/her motor behavior, favoring specific aspects of motor development and impairing
others. A very influential factor (and consequently a very significant educational means) is the use of intervention movement
programs. A developmentally adequate movement program can enhance motor development, thus preventing the long term negative
consequences that an unfavorable influence of several genetic or the aforementioned environmental factors may have. 相似文献
17.
18.
许敏 《和田师范专科学校学报》2007,27(5):201-202
二战后美国成为了现代艺术的中心,美国抽象表现主义在各种影响下应运而生,迅速成为上个世纪四、五十年代美国主要的美术思潮,并波及欧美各国。其代表人物波洛克用他特殊的作画方式彻底抛弃传统的技巧和图象,启迪了行为艺术的产生。 相似文献
19.
凤阳花鼓舞蹈动作形态分析 总被引：2，自引：0，他引：2
对凤阳花鼓舞蹈艺术的研究,不仅要研究其舞蹈形态,而且要研究产生凤阳花鼓舞蹈的社会和自然等环境因子。凤阳花鼓舞蹈动作的产生与其地域的自然和人文环境密不可分,文章通过对凤阳花鼓典型舞畴因子、影响舞蹈语汇的环境因子进行了逐一分析,阐述了凤阳花鼓舞蹈动作的形态。 相似文献
20.
Penny Hauser-Cram 《Child development》1996,67(1):236-248
Prior research on school-age children with mental retardation indicates that they are less motivated on tasks than mental-age-matched peers. In this study, mastery motivation on two tasks was compared for 1- and 2-year-old children with motor impairment ( n = 25), developmental delay ( n = 25), and typical development ( n = 25), matched for mental age. The groups did not differ significantly on any measure of mastery motivation. The relative contribution of premature birth, a history of seizure disorders, severity of cognitive delay, and maternal didactic interaction in predicting mastery motivation was examined for toddlers with developmental delay or motor impairment. Maternal didactic interaction added a significant proportion of variance above and beyond other variables in predicting several aspects of mastery motivation in toddlers with developmental disabilities. 相似文献