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   669篇
  免费   28篇
  2021年   7篇
  2020年   10篇
  2019年   7篇
  2018年   15篇
  2017年   18篇
  2016年   18篇
  2015年   15篇
  2014年   16篇
  2013年   77篇
  2012年   32篇
  2011年   30篇
  2010年   13篇
  2009年   20篇
  2008年   28篇
  2007年   29篇
  2006年   19篇
  2005年   27篇
  2004年   23篇
  2003年   26篇
  2002年   30篇
  2001年   14篇
  2000年   11篇
  1999年   10篇
  1998年   10篇
  1997年   9篇
  1996年   6篇
  1995年   5篇
  1994年   12篇
  1993年   7篇
  1992年   9篇
  1991年   8篇
  1989年   5篇
  1988年   6篇
  1987年   8篇
  1986年   8篇
  1985年   9篇
  1984年   4篇
  1983年   7篇
  1982年   8篇
  1981年   16篇
  1980年   7篇
  1979年   4篇
  1978年   6篇
  1977年   8篇
  1976年   5篇
  1974年   10篇
  1971年   3篇
  1970年   3篇
  1965年   2篇
  1956年   3篇
排序方式: 共有697条查询结果,搜索用时 15 毫秒
621.
Discrepancies between observers are common in studies of child behavior problems that rely on behavior ratings. Although modest concordance between informants is well-documented, little is known about characteristics that predict discrepancies. In 477 children aged 5 to 12 years, maternal age and indicators of socioeconomic status (SES; maternal education, family income) were evaluated in relation to score discrepancies between the Child Behavior Checklist and Teacher Report Form for Total, Externalizing and Internalizing Problems. Family income <?$35,000 was independently associated with discrepancies in which mothers rated more clinically significant child behavior problems than teachers for Total, Externalizing and Internalizing Problems [odds ratio (OR)?=?3.26, 95 % confidence interval (CI), 1.19–8.96, OR?=?2.76, 95 % CI 1.03–7.34 and OR?=?3.07, 95 % CI 1.30–7.26, respectively]. Maternal education was not associated with discrepancies, but younger mothers were less likely to rate child’s behavior in the clinical range for Externalizing Problems than teachers (OR per year of age?=?0.88, 95 % CI 0.81–0.96). These results suggest that studies that utilize only maternal or teacher report of child behavior may have misclassification of outcomes that is dependent on SES and could produce biased results.  相似文献   
622.
This study examined the effects of sex referent cues for the estimation of success, as well as actual performance on a simple motor endurance task. Boys and girls in grades 3 and 5 (N = 160) were randomly assigned to one of three referent groups or a control group. Subjects in the referent groups were given an identical referent score, (48), presented in three different forms: the average score for boys, the average score for girls, and the average score for children. The control group was given no referent score. Subjects were required to estimate their own success and then perform a timed side-to-side jump over a rope. Results suggest that as girls increase in age there is a decrease in their confidence in performing motor skills. Further, boys and girls at the two grade levels responded differently to the sex referent cues.  相似文献   
623.
The Great Recession brought many changes to the work and financial lives of American families. Little is known, however, about how changes in parental work conditions in recessionary times influence children's vocational development. Drawing on data from the Youth Development Study, we examine whether parents' recessionary experiences shape adolescents' work values. The findings indicate that adolescents' work values are shaped through a cross-generational reinforcement model; both extrinsic and intrinsic values are stronger when parental work conditions are more rewarding. In an exception to this pattern, unemployment among parents with low levels of education (high school degrees or less) is positively associated with children's extrinsic and intrinsic orientations, more consistent with a compensation model.  相似文献   
624.
The present study was specifically designed to investigate the prevalence of auditory verbal hallucinations (AVH) in the general population, and sought to compare similarities and differences regarding socio‐demographics, mental health and severe life events between individuals who have never experienced AVH with those who had. The study also aimed to compare those who sought professional help for their experience of AVH with those who had not sought help. Through a postal questionnaire, 2,533 participants ages 18 and over from a national survey completed the Launay‐Slade Hallucinations Scale and other measures examining AVH characteristics and other areas related to AVH. In total, 7.3% of the sample reported a life‐time prevalence of AVH. Those with AVH were more likely to be single and unemployed, reported higher levels of depression and anxiety, and experienced a higher number of severe life events compared with those without AVH. Only 16% of those who experienced AVH in the general population sought professional help for these experiences. Compared to those who did not seek professional help, participants that had were more likely to experience AVH with a negative content, experience them on a daily basis, undergo negative reactions when experiencing AVH, and resist AVH. In conclusion, the prevalence of AVH was found to be relatively high. The results also revealed higher levels of reduced mental health for individuals who sought professional help, followed by those who did not, compared with those who had never experienced AVH.  相似文献   
625.
Age-related differences in episodic memory judgments assessing recall of fact information and the source of this information were examined. The role of executive function (EF) in supporting early episodic memory ability was also explored. Four- and 6-year-old children were taught 10 novel facts from two different sources (experimenter or puppet), and memory for both fact and source information was later tested. Measures of working memory, inhibitory control, and set shifting were obtained to produce an indicator of children's EF. Six-year-olds recalled more fact and source information than did 4-year-olds. Regression analyses revealed that age, language ability, and EF accounted for unique variance in children's fact recall and source recall performance. These findings suggest a link between episodic memory and EF, and we propose that developmental investigations should further explore this association.  相似文献   
626.
627.
Science and Technology Studies (STS) projects often aim at understanding social problems and epistemic challenges in science and, more generally, in the technoscientific worlds we inhabit. However, it is often unclear if and how these projects can help address the problems they identify. Scholars such as Donna Haraway, John Law, and Karen Barad have argued that STS methods always interfere with the contexts they study. Combining this insight with recent feminist scholarship on the politics of care in technoscience suggests that a better understanding of how our research practices already interfere can help us attune our methods in order to promote care as part our research practices. One avenue to investigate this hypothesis is to return to a completed study and reconstruct how its research methods have created interference effects that promoted or could promote care for the problems the study identified. In the case at hand, the methods investigated are interviews with life scientists in Austria and the USA. The problem they defined is that current career rationales in the life sciences, which foreground individualism, mobility, and competition hinder collaboration, teamwork, and mentoring, strain group cohesion, and tend to exclude certain groups. Reframing the research interviews as ‘agential conversations’ that interfered with the contexts they sought to understand shows how the interviews also created situated moments of reflection, connection, and disruption that could serve as a basis for responding to these problematic conditions affecting researchers in the life sciences and beyond.  相似文献   
628.
This neuroimaging study examines the development of cognitive flexibility using the Change task in a sample of youths and adults. The Change task requires subjects to inhibit a prepotent response and substitute an alternative response, and the task incorporates an algorithm that adjusts task difficulty in response to subject performance. Data from both groups combined show a network of prefrontal and parietal areas that are active during the task. For adults vs. youths, a distributed network was more active for successful change trials versus go, baseline, or unsuccessful change trials. This network included areas involved in rule representation, retrieval (lateral PFC), and switching (medial PFC and parietal regions). These results are consistent with data from previous task-switching experiments and inform developmental understandings of cognitive flexibility.  相似文献   
629.
630.
Two analytical procedures for identifying young children as categorizers, the Monte Carlo Simulation and the Probability Estimate Model, were compared. Using a sequential touching method, children aged 12, 18, 24, and 30 months were given seven object sets representing different levels of categorical classification. From their touching performance, the probability that children were categorizing was then determined independently using Monte Carlo Simulation and the Probability Estimate Model. The two analytical procedures resulted in different percentages of children being classified as categorizers. Results using the Monte Carlo Simulation were more consistent with group-level analyses than results using the Probability Estimate Model. These findings recommend using the Monte Carlo Simulation for determining individual categorizer classification.  相似文献   
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