首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   231篇
  免费   3篇
  234篇
  2021年   2篇
  2019年   7篇
  2018年   5篇
  2017年   6篇
  2016年   7篇
  2015年   6篇
  2014年   9篇
  2013年   23篇
  2012年   15篇
  2011年   13篇
  2010年   2篇
  2009年   5篇
  2008年   7篇
  2007年   8篇
  2006年   13篇
  2005年   9篇
  2004年   7篇
  2003年   4篇
  2002年   5篇
  2001年   4篇
  2000年   6篇
  1999年   3篇
  1998年   2篇
  1997年   4篇
  1995年   6篇
  1994年   4篇
  1993年   4篇
  1992年   5篇
  1991年   2篇
  1989年   3篇
  1988年   1篇
  1987年   3篇
  1986年   1篇
  1985年   3篇
  1984年   4篇
  1983年   3篇
  1982年   2篇
  1981年   2篇
  1980年   1篇
  1978年   2篇
  1976年   1篇
  1975年   1篇
  1974年   2篇
  1972年   2篇
  1971年   1篇
  1969年   1篇
  1968年   1篇
  1966年   1篇
  1963年   1篇
  1962年   1篇
排序方式: 共有234条查询结果,搜索用时 0 毫秒
51.
The impact of the hierarchical organization of a space on judgments of direction and distance was assessed in two studies using two-dimensional models analogous to those used by A. Stevens and P. Coupe (1978, Cognitive Psychology, 10, 422–437). In each study the models contained two stars and were divided into two parts by a curved boundary line. In the Homogeneous condition the stars were located in the same subsection. In the Congruent condition the leftmost star was in the left subsection and the rightmost star was in the right subsection. In the Incongruent condition the rightmost star was in the left subsection and the leftmost star was in the right subsection. In Experiment 1 first graders, third graders, and college students were required to remember the location of the stars. Results indicated that the first and third graders tended to use the relationship between the subsections as a clue to the relationship between the sites within them, thus extending the results of Stevens and Coupe (1978) to children. In Experiment 2 preschoolers, first, and third graders were asked to judge with the materials directly in front of them, which of the two stars was closer to a site located in one of the subsections. Results indicated that the Incongruent condition led to errors among the preschoolers and first graders but not the third graders, thus indicating that these groups tended to judge as closer the site within the same subsection even though it was really farther away. The results of both studies are discussed as indicative of a tendency among young children to impose organization on information encoded in memory and in relation to increases in metric accuracy, decentration, and efficient scanning which enable them to more accurately evaluate when such organization is and is not appropriate. Implications for behavior in large-scale environments are also discussed, with particular reference to the effect of barriers on perceptions of distance and direction.  相似文献   
52.
This paper summarizes the results from a pilot study, designed to test a method of measuring the quality of care provided in two residential units for severely mentally handicapped children. The overall aim has been to devise general measures of the learning conditions (the quality of care) within residential units, which relate to groups of clients, and which are equally applicable at different times of the waking day. Such measures will only constitute a helpful monitoring instrument if they are shown to be reliable; to have, at least, face-validity: to be based upon representative and accurate data; and if they differentiate between settings which, intuitively, appear to differ in the extent to which the clients' appropriate behaviour is prompted and reinforced.  相似文献   
53.
A tracking procedure was used to investigate the time required to train cats to discriminate between a frequency-modulated tone and a steady tone. The animal was reinforced with food on a VR schedule only when the steady tone was present and the animal pressed the correct bar (one of two). After reinforcement, the steady tone usually changed to a frequency-modulated signal; by pressing the other bar, the tone could be changed to its steady state and the reinforcement then obtained as before. A major difficulty was the lack of control by the auditory stimulus on the cat's responses. This problem was solved by introducing interpress time outs which forced the animal to hesitate after every press. The use of light cues to signal the time outs and the correct bar to press accelerated the rate at which the training progressed.

With cats, this conditioning procedure apparently requires a much longer training period before the actual threshold determinations than the more commonly used avoidance conditioning procedures. However, when animals are to be tested repeatedly over a period of several months or longer, the procedure may prove the more desirable one because it reduces experimental neurosis.

  相似文献   
54.
Lexical ambiguity resolution was investigated in 9- to 17-year-olds with language impairment (LI, n=20), autistic spectrum disorder (ASD) plus language impairment (ALI, n=28), ASD and verbal abilities within the normal range (ASO, n=20), and typically developing children (TD, n=28). Experiment 1 investigated knowledge of dominant and subordinate meanings of ambiguous words. The LI and ALI groups knew fewer subordinate meanings than did the ASO and TD groups. Experiment 2 used a modified version of the paradigm to investigate contextual facilitation and suppression of irrelevant meanings. All groups demonstrated contextual facilitation, responding quickly and more accurately to words following a biased context. However, children with ALI and LI did not use context as efficiently as did their peers without language deficit. Furthermore, for the LI and ALI groups, errors in the suppression condition reflected poor contextual processing. These findings challenge the assumptions of weak central coherence theory and demonstrate the need for stringent language controls in the study of autistic cognition.  相似文献   
55.
Abstract

It is fitting that a volume on post-traumatic stress includes chapters on sexual assault given both the prevalence of sexual assault and its effects. Specifically, in terms of prevalence, approximately one woman in five in the United States will be raped in her lifetime (Koss, 1993).1 In terms of the effects of sexual assault, victims experience heightened fear, anxiety, and depression for several months, and sometimes years, following an assault (see Frazier & Borgida, 1997, and Resick, 1993, for reviews). Sexual victimization affects physical health as well and is a more powerful predictor of physician visits and outpatient medical costs than other factors (e.g., age, smoking, alcohol use) known to be related to health problems (Koss, Koss, & Woodruff, 1991). Finally, sexual assault is one of the traumatic events that is most likely to lead to posttraumatic stress disorder (PTSD) (Breslau, Davis, Andreski, & Peterson, 1991; Norris, 1992; Ullman & Siegel, 1994). In a recent national study of trauma exposure and PTSD by Kessler and his colleagues (Kessler, Sonnega, Bromet, Hughes, & Nelson, 1995), almost half of the women who said that a rape was their worst trauma met lifetime criteria for PTSD. This is in comparison, for example, with a PTSD prevalence rate of 5% for those whose worst event was a natural disaster.  相似文献   
56.
    
Eye‐tracking paradigms are increasingly used to investigate higher‐level social and cognitive processing in autism spectrum disorder (ASD). However, the integrity of the oculomotor system within ASD is unclear, with contradictory reports of aberrant eye‐movements on basic oculomotor tasks. The purpose of the current study was to determine whether reducing population heterogeneity and distinguishing neurocognitive phenotypes can clarify discrepancies in oculomotor behaviour evident in previous reports. Reflexive and volitional eye‐movement control was assessed in 73 children aged 8–14 years from four distinct groups: Autism Language Normal (ALN), Autism Language Impaired (ALI), non‐autistic Language Impaired (LI) and Typically Developing (TD). Eye‐movement control was measured using pro‐ and antisaccade tasks and a novel ‘search distracter’ task to measure distractibility. Reflexive eye‐movements were equivalent across groups, but deficits in volitional eye‐movement control were found that aligned with language status, and were not specific to ASD. More than 80% of ALI and LI children presented error rates at least 1.5 SDs below the TD mean in an antisaccade task. In the search distracter task, 35.29% of ALI children and 43.75% of LI children had error rates greater than 1.5 SDs compared with 17.64% of ALN children. A significant proportion of children with neurodevelopmental disorders involving language function have pronounced difficulties suppressing reflexive saccades and maintaining fixations in the presence of competing stimuli. We extend the putative link between ALI and LI populations to non‐language tasks, and highlight the need to account for co‐morbidity in understanding the ontogenesis of ASD.  相似文献   
57.
    
  相似文献   
58.
    
This study informs community science, and seeks to narrow the research-to-practice gap, by examining how the interpersonal networks within a setting influence individuals' use of interventions. More specifically, it explores the role of two network mechanisms-cohesion and structural similarity-in urban elementary school teachers' use of interventions designed to improve academic and behavioral outcomes for students. Lagged regression models examine how position in advice giving networks influenced weekly use of the daily report card and peer assisted learning by kindergarten through fourth grade teachers in three schools. Results indicate that intervention use spreads among teachers with similar patterns of advice-giving relationships (i.e., via structural similarity), rather than from teachers who are sources of advice (i.e., via cohesion). These results are consistent with findings in other settings, and suggest that researchers wishing to increase the use of an intervention should select change agents based on their patterns of their relationships, rather than on their direct connections.  相似文献   
59.
    
The motivations for rural and agricultural development in the twenty-first century are not different from previous centuries, but evolving technologies in the late twentieth century have altered many methods and institutional arrangements for accomplishing development. The internet has facilitated initiatives that in earlier decades would have required large, complex organizations in both donor and developing countries. We will compare the ethical and institutional strengths and weaknesses of two such initiatives in Malawi: a smallholder farmers organization involved in fair trade and the Millennium Village Project. These are two of a large array of institutions which are currently being used to benefit smallholder agricultural producers. We will examine their relative merits through the lenses of various ethical paradigms and show that the institutional arrangements of the two programs are complimentary in the evolution of agricultural trading systems linking the global north and south.  相似文献   
60.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号