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   598篇
  免费   31篇
  2023年   10篇
  2022年   7篇
  2021年   13篇
  2020年   8篇
  2019年   23篇
  2018年   25篇
  2017年   14篇
  2016年   29篇
  2015年   14篇
  2014年   25篇
  2013年   69篇
  2012年   33篇
  2011年   34篇
  2010年   21篇
  2009年   20篇
  2008年   19篇
  2007年   24篇
  2006年   25篇
  2005年   20篇
  2004年   18篇
  2003年   22篇
  2002年   18篇
  2001年   5篇
  2000年   7篇
  1999年   4篇
  1998年   6篇
  1997年   7篇
  1996年   7篇
  1994年   5篇
  1993年   4篇
  1992年   6篇
  1989年   2篇
  1988年   7篇
  1987年   4篇
  1986年   4篇
  1985年   15篇
  1984年   7篇
  1983年   2篇
  1982年   5篇
  1981年   5篇
  1980年   4篇
  1979年   5篇
  1978年   5篇
  1975年   5篇
  1973年   3篇
  1972年   2篇
  1971年   2篇
  1968年   1篇
  1967年   1篇
  1965年   1篇
排序方式: 共有629条查询结果,搜索用时 15 毫秒
131.
An investigation was made into the disruptive effects on pitch recognition produced by tones taken from beyond the octave from which the standard (S) and comparison (C) tones were taken. Pitch recognition was required after a retention interval during which eight other tones were played. Errors were compared for sequences in which the interpolated tones were taken from the same octave as were the S and C tones; in which they were taken from the octave above; in which they were taken from the octave below; and in which half of the intervening tones were taken from the octave above and the other half from the octave below, the order of choice of octave within the sequence being random. Large disruptive effects were produced by interpolated tones drawn from the higher and lower octaves, though these effects were slightly less than those produced by tones drawn from the same octave. The greatest disruptive effect occurred when the intervening tones in any one sequence were drawn from both the higher and the lower octaves. The implications of these findings are discussed.  相似文献   
132.
Prevalence rates of hyperactivity in Italy using commonly accepted cutoff scores in the United States were 20% for boys and 3% for girls;the combined prevalence rate was 12%. Italian children exhibited rates of hyperactive behaviors similar to those of children in New Zealand, Spain, and portions of the United States. Nevertheless, rates of hyperactivity are influenced by ethnic and cultural factors, and differences in prevalence rates may be expected in many situations. Factor structures of the Conners' Teacher Rating Scale for boys and girls were different. The need for separate factor analyses for males and females is stressed;hyperactivity and conduct problems, in fact, were separate factors for girls whereas such behaviors were subsumed under one factor for boys. There were also important similarities and differences with the factor structures for boys and girls in Italy and Spain. Methodological issues such as complete specification of the sample and assuring representativeness of samples are discussed.The authors give special thanks to John Richters III and Julian Barling, who aided in the computer analysis of these data; Susan O'Leary, who gave substantive and editorial feedback; and Julian Barling and Ileana Arias, who provided helpful editorial comments.  相似文献   
133.
Young women's motivations for two sex-role options were predicted with scores describing perceived rewards/costs of parenting. Using a sequence of multiple regression analyses it was found that the reward-cost perceptions of parenting and work were predictors of the two motivational options. Individual rewards/costs of parenting and work items were better predictors than summed items. It was found that a preference for the career choice was produced by not viewing parenting as rewarding. The preference for parenting choice was influenced most by perceiving parenting as rewarding. The perceived cost and rewards of work were not predictors of a career choice. The items found to be the best predictors for either the parenting or career choice all dealt with perceptions of parenting. It was concluded that these parenting perceptions are the key elements for young women's role motivations.  相似文献   
134.
Spinal cord injury can cause cognitive impairments even when no cerebral lesion is appreciable. As patients are forced to explore the environment in a non-canonical position (i.e., seated on a wheelchair), a modified relation with space can explain motor-related cognitive differences compared to non-injured individuals. Peripersonal space is encoded in motor terms, that is, in relation to the representation of action abilities and is strictly related to the affordance of reachability. In turn, affordances, the action possibilities suggested by relevant properties of the environment, are related to the perceiver's peripersonal space and motor abilities. One might suppose that these motor-related cognitive abilities are compromised when an individual loses the ability to move. We shed light on this issue in 10 patients with paraplegia and 20 matched controls. All have been administered an affordances-related reachability judgement task adapted from Costantini, Ambrosini, Tieri, Sinigaglia, and Committeri (2010, Experimental Brain Research, 207, 95) and neuropsychological tests. Our findings demonstrate that patients and controls show the same level of accuracy in estimating the location of their peripersonal space boundaries, but only controls show the typical overestimation of reaching range. Secondly, patients show a higher variability in their judgements than controls. Importantly, this finding is related to the patients’ ability to perform everyday tasks. Finally, patients are not faster in making their judgements on reachability in peripersonal space, while controls are. Our results suggest that not moving freely or as usual in the environment impact decoding of action-related properties even when the upper limbs are not compromised.  相似文献   
135.
136.
Family food routines are important contexts through which children develop math knowledge and skills. The Food For Thought (FFT) program teaches Latino parents strategies to develop their kindergarten children's math abilities during family food routines such as grocery shopping and cooking. We examined whether attendance to FFT was related to children's math outcomes at post-test (right after program completion). Sixty-eight low-income Latino parents and their kindergarten children (M?=?71 months) participated in the four-week program taking place in schools. Children's math skills (counting, numeral recognition and cardinal understanding) were assessed at pre- and post-test. The association between parents' attendance to FFT meetings and children′s math outcomes at post-test depended on children's initial levels of math skills (i.e., math skills at pre-test). Children with lower initial math skills whose parents attended more FFT meetings had more advanced math outcomes at post-test, than children with lower initial math skills whose parents attended fewer FFT meetings. The effect size of this interaction was moderate, d?=?0.46. Limitations and future directions of this early math intervention targeting Latino families are discussed.  相似文献   
137.
Breast cancer presents physical and psychological challenges, but can also result in posttraumatic growth (PTG). Twenty-four women completed Psycho-Spiritual Integrative Therapy (PSIT) treatment and completed assessments for PTG and QOL before, immediately following, and 1 month after treatment. Women showed improvement (p?相似文献   
138.
The ability of neurons to modify their synaptic strength in an activity-dependent manner has a crucial role in learning and memory processes. It has been proposed that homeostatic forms of plasticity might provide the global regulation necessary to maintain synaptic strength and plasticity within a functional dynamic range. Similarly, it is considered that the capacity of synapses to express plastic changes is itself subject to variation dependent on previous experience. In particular, training in several behavioral tasks modifies the possibility to induce long-term potentiation (LTP). Our previous studies in the insular cortex (IC) have shown that induction of LTP in the basolateral amygdaloid nucleus (Bla)-IC projection previous to conditioned taste aversion (CTA) training enhances the retention of this task. The aim of the present study was to analyze whether CTA training modifies the ability to induce subsequent LTP in the Bla-IC projection in vivo. Thus, CTA trained rats received high frequency stimulation in the Bla-IC projection in order to induce LTP 48, 72, 96 and 120 h after the aversion test. Our results show that CTA training prevents the subsequent induction of LTP in the Bla-IC projection, for at least 120 h after CTA training. We also showed that pharmacological inhibition of CTA consolidation with anisomycin (1 μl/side; 100 μg/μl) prevents the CTA effect on IC-LTP. These findings reveal that CTA training produces a persistent change in the ability to induce subsequent LTP in the Bla-IC projection in a protein-synthesis dependent manner, suggesting that changes in the ability to induce subsequent synaptic plasticity contribute to the formation and persistence of aversive memories.  相似文献   
139.
140.
In a series of experiments, we investigated the dependence of contextual cueing on working memory resources. A visual search task with 50 % repeated displays was run in order to elicit the implicit learning of contextual cues. The search task was combined with a concurrent visual working memory task either during an initial learning phase or a later test phase. The visual working memory load was either spatial or nonspatial. Articulatory suppression was used to prevent verbalization. We found that nonspatial working memory load had no effect, independent of presentation in the learning or test phase. In contrast, visuospatial load diminished search facilitation in the test phase, but not during learning. We concluded that visuospatial working memory resources are needed for the expression of previously learned spatial contexts, whereas the learning of contextual cues does not depend on visuospatial working memory.  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