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   725篇
  免费   48篇
  773篇
  2024年   1篇
  2023年   21篇
  2022年   11篇
  2021年   27篇
  2020年   34篇
  2019年   22篇
  2018年   41篇
  2017年   46篇
  2016年   39篇
  2015年   25篇
  2014年   29篇
  2013年   76篇
  2012年   52篇
  2011年   45篇
  2010年   31篇
  2009年   21篇
  2008年   39篇
  2007年   38篇
  2006年   36篇
  2005年   23篇
  2004年   23篇
  2003年   25篇
  2002年   13篇
  2001年   5篇
  2000年   5篇
  1999年   3篇
  1998年   3篇
  1997年   5篇
  1996年   5篇
  1995年   3篇
  1993年   3篇
  1992年   1篇
  1991年   1篇
  1989年   2篇
  1986年   2篇
  1985年   2篇
  1984年   1篇
  1983年   2篇
  1982年   1篇
  1981年   2篇
  1978年   1篇
  1974年   1篇
  1968年   1篇
  1959年   2篇
  1954年   2篇
  1953年   1篇
  1941年   1篇
排序方式: 共有773条查询结果,搜索用时 0 毫秒
261.
The interpretation of size terms involves constructing contextually-relevant reference points by combining visual cues with knowledge of typical object sizes. This study aims to establish at what age children learn to integrate these two sources of information in the interpretation process and tests comprehension of the Dutch adjectives groot ‘big’ and klein ‘small’ by 2- to 7-year-old children. The results demonstrate that there is a gradual increase in the ability to inhibit visual cues and to use world knowledge for interpreting size terms. 2- and 3-year-old children only used the extremes of the perceptual range as reference points. From age four onwards children, like adults, used a cut-off point in the mid-zone of a series. From age five on, children were able to integrate world knowledge and perceptual context. Although 7-year-olds could make subtle distinctions between sizes of various object classes, their performance on incongruent items was not yet adult-like.  相似文献   
262.
A discussion is given of the research in the foundations of mathematics of Mario Pieri (1860-1913) and how it compares with the works of Christian von Staudt (1798-1867), Giuseppe Peano (1858-1932), David Hubert (1862-1943), and Alfred Tarski (1902-1983). The author demonstrates that the acceptance of Pieri’s results was overshadowed by the research of these four scholars, and argues that Pieri’s work merits a more significant place in the history of mathematics than it currently enjoys  相似文献   
263.
Awareness that the child is part of a complex relational system has ensured that all child analysts agree on the necessity of establishing a therapeutic alliance with the parents. Unconscious conflictual dynamics involve the child analyst and include him, from the time of the initial consultation, in an analytic field that is closer to that of a group than to the bi‐personal set‐up of therapy with adults. Through a clinical example, the author hypothesizes that the child’s drawings and play can be viewed as tools capable of mapping the unconscious emotions present in an analytic field that extends beyond the analyst–child couple. Play and drawings can be used in the relationship with the parents not in an explanatory sense, but as a probe with which to explore the universe of unconscious emotions present in the group field. The images or the story of the play used with this particular modality prove to be an attractive pathway that is effective in facilitating the alpha function of each of the members of the group. Furthermore, in this sense, they create the conditions for an occasion through which the parents can become more aware of their own unconscious emotions that have been entrusted to the child and expressed through his symptomatology. The possibility for the little group of subjects involved in a child analysis for oscillation in a dual–group field permits not only a shared experience of knowledge, but also a shared creativity aimed at knowledge of emotional truth (O).  相似文献   
264.
In several mammalian and avian species, females show a higher performance than males in tasks requiring cognitive flexibility such as the discrimination reversal learning. A recent study showed that female guppies are twice as efficient as males in a reversal learning task involving yellow–red discrimination, suggesting a higher cognitive flexibility in female guppies. However, the possibility exists that the superior performance exhibited by females does not reflect a general sex difference in cognitive abilities, but instead, is confined to colour discrimination tasks. To address this issue, we compared male and female guppies in two different discrimination reversal learning tasks and we performed a meta-analysis of these experiments and the previous one involving colour discrimination. In the first experiment of this study, guppies were tested in a task requiring them to learn to select the correct arm of a T-maze in order to rejoin a group of conspecifics. In experiment 2, guppies were observed in a numerical task requiring them to discriminate between 5 and 10 dots in order to obtain a food reward. Although females outperformed males in one condition of the T-maze, we did not find any clear evidence of females’ greater reversal learning performance in either experiment. However, the meta-analysis of the three experiments supported the hypothesis of females’ greater reversal learning ability. Our data do not completely exclude the idea that female guppies have a generally higher cognitive flexibility than males; however, they suggest that the size of this sex difference might depend on the task.  相似文献   
265.
The research on imitation in the animal kingdom has more than a century-long history. A specific kind of imitation, auditory–vocal imitation, is well known in birds, especially among songbirds and parrots, but data for mammals are limited to elephants, marine mammals, and humans. Cetaceans are reported to imitate various signals, including species–specific calls, artificial sounds, and even vocalizations from other species if they share the same habitat. Here we describe the changes in the vocal repertoire of a beluga whale that was housed with a group of bottlenose dolphins. Two months after the beluga’s introduction into a new facility, we found that it began to imitate whistles of the dolphins, whereas one type of its own calls seemed to disappear. The case reported here may be considered as an interesting phenomenon of vocal accommodation to new social companions and cross-species socialization in cetaceans.  相似文献   
266.
In the last decade, visual illusions have been repeatedly used as a tool to compare visual perception among species. Several studies have investigated whether non-human primates perceive visual illusions in a human-like fashion, but little attention has been paid to other mammals, and sensitivity to visual illusions has been never investigated in the dog. Here, we studied whether domestic dogs perceive the Delboeuf illusion. In human and non-human primates, this illusion creates a misperception of item size as a function of its surrounding context. To examine this effect in dogs, we adapted the spontaneous preference paradigm recently used with chimpanzees. Subjects were presented with two plates containing food. In control trials, two different amounts of food were presented in two identical plates. In this circumstance, dogs were expected to select the larger amount. In test trials, equal food portion sizes were presented in two plates differing in size: if dogs perceived the illusion as primates do, they were expected to select the amount of food presented in the smaller plate. Dogs significantly discriminated the two alternatives in control trials, whereas their performance did not differ from chance in test trials with the illusory pattern. The fact that dogs do not seem to be susceptible to the Delboeuf illusion suggests a potential discontinuity in the perceptual biases affecting size judgments between primates and dogs.  相似文献   
267.
Background/Objectives: Motivational Enhancement Treatment in Spanish (METS) is a brief intervention aimed at resolving patient ambivalence towards behavior change that has demonstrated efficacy in substance use disorder treatment to reduce use and increase treatment engagement in different populations. In order to have evidence for its implementation in Mexico, a multi-site, randomized, two-arm, controlled clinical trial was conducted at three outpatient addiction treatment centers in the country to compare the effect of METS with Counseling as Usual (CAU). Method: One hundred and twenty patients were randomized to receive three sessions of METS (n = 54) or CAU (n = 66) during the first four weeks of treatment and were assessed during the following 12 weeks. Primary outcome measures were self-reported days of substance use and of treatment services utilization, which were tested using Generalized Estimating Equations. Results: Results associated both conditions with significant changes in substance use over, whereas there were no differences between conditions in substance use or in service utilization. Conclusions: Findings do not support the hypothesis that METS is more effective than CAU, but suggest that brief interventions at treatment initiation may improve patient outcomes.  相似文献   
268.
Of 212 practicing therapists who completed a survey about working with meaning in life (MIL) in psychotherapy, 129 (61%) had recently worked with MIL with at least one client and reported on their work with a client in this survey. Those therapists who had worked with a client on MIL as compared with those who had not were older, more experienced, more humanistic/existential/experiential in orientation; reported more MIL training; and felt more competent working with MIL. Clients reported on primarily had internalizing, interpersonal, and career issues. Only 12% of clients explicitly labeled MIL as an issue coming into therapy. The three most frequently used interventions involved offering support; helping clients examine thoughts, feelings, and behaviors to discover hopes and goals; and facilitating exploration of MIL cognitions and experiences. Therapists reported many positive consequences from working with MIL. Therapists reported minimal training in MIL and moderate competence in working with MIL. Implications for practice, training, and research are presented.  相似文献   
269.
The longitudinal study aims to expand what is known about the costs and benefits of narrating stressful experiences by exploring changes in rumination within the narrative process and comparing it to changes in self-reflection. Rumination (e.g., brooding, self-criticism, and negative emotions) and self-reflection were measured in stress narratives of 56 college students. There were several goals: (1) examine changes in narrative rumination and narrative self-reflection over 3 days of writing, (2) examine the relations among the changes in narrative rumination variables and narrative self-reflection and (3) examine how changes in narrative rumination and narrative self-reflection relate to multiple measures of psychological functioning. Overall, individuals increased self-reflection over the 3-day writing task. Individuals who increased ruminative brooding across the 3 days of writing showed lower ego identity development (short term and long term) and self-esteem (short term), while increased self-criticism was positively correlated with identity distress (short term). Implications of the different aspects of narrative rumination, specifically in the context of stressful experiences, are discussed.  相似文献   
270.
We investigated academic and behavioral outcomes of internationally adopted children and the associations between these outcomes and age at adoption, time spent in the adoptive family, and parenting. At two time points (T1 and T2, ~15 months apart), we examined early academic skills (school readiness), and parent-reported behavioral adjustment (internalizing and externalizing behavior) and adaptive functioning of a sample of 75 children (45.9% boys, mean age?=?5.17 years) adopted from Russia into US families. We also collected parents’ self-assessments of their parenting at T1. Children who were adopted at a younger age showed higher levels of early academic skills. Correlations between age at adoption and other outcomes were overall small and mostly non-significant. However, adoptees’ academic and behavioral progress differed notably in several respects. Specifically, adoptees improved in early academic skills over time, whereas, as a group, their adaptive functioning and behavioral adjustment remained stable within the normal range. Early academic skills were not related to behavioral adjustment at each time point and over time. The time spent in the adoptive family was positively related to early academic skills at T2. Whereas outcomes showed little to no relation to parenting as reported by mother and father separately, higher discrepancies between mothers' and fathers' reports of positive parenting were related to higher levels of behavioral symptoms and lower levels of adaptive skills at T2. These differential results may be explained in part by drawing upon the notion of dissociated domains of psychological and sociocultural adaptation and acculturation, outlined in the immigration literature. These results also bring to light the possible importance of between-parent consistency in parenting for adoptees’ behavioral outcomes.  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