全文获取类型
收费全文 | 3372篇 |
免费 | 127篇 |
国内免费 | 3篇 |
专业分类
3502篇 |
出版年
2023年 | 20篇 |
2021年 | 29篇 |
2020年 | 41篇 |
2019年 | 61篇 |
2018年 | 89篇 |
2017年 | 82篇 |
2016年 | 111篇 |
2015年 | 64篇 |
2014年 | 108篇 |
2013年 | 384篇 |
2012年 | 169篇 |
2011年 | 165篇 |
2010年 | 96篇 |
2009年 | 80篇 |
2008年 | 129篇 |
2007年 | 159篇 |
2006年 | 142篇 |
2005年 | 150篇 |
2004年 | 134篇 |
2003年 | 127篇 |
2002年 | 117篇 |
2001年 | 54篇 |
2000年 | 50篇 |
1999年 | 45篇 |
1998年 | 65篇 |
1997年 | 62篇 |
1996年 | 38篇 |
1995年 | 26篇 |
1994年 | 45篇 |
1993年 | 40篇 |
1992年 | 38篇 |
1991年 | 27篇 |
1990年 | 23篇 |
1989年 | 32篇 |
1988年 | 36篇 |
1987年 | 27篇 |
1986年 | 19篇 |
1985年 | 26篇 |
1984年 | 41篇 |
1983年 | 43篇 |
1982年 | 41篇 |
1981年 | 27篇 |
1980年 | 24篇 |
1979年 | 27篇 |
1978年 | 39篇 |
1977年 | 18篇 |
1976年 | 33篇 |
1975年 | 20篇 |
1974年 | 24篇 |
1973年 | 20篇 |
排序方式: 共有3502条查询结果,搜索用时 0 毫秒
261.
262.
263.
264.
265.
Stephen A. Marshall Steven W. Evans Ricardo B. Eiraldi Stephen P. Becker Thomas J. Power 《Journal of abnormal child psychology》2014,42(1):77-90
Sluggish cognitive tempo (SCT) was originally identified as a construct that characterized the inattention problems of some children with attention deficit disorder (ADD). Research has indicated that using SCT symptoms to identify a subset of youth with attention-deficit/hyperactivity disorder, predominately inattentive type (ADHD-IT) may elucidate distinct patterns of impairment and thereby improve the external validity of ADHD subtypes. The objective of the current study was to investigate whether youth with clinically-assessed ADHD-IT and high levels of SCT exhibit unique social and academic impairments. In a clinic-referred sample of youth (N?=?209; 23 % female) aged 6 to 17 years, participants who met criteria for three different groups were identified: ADHD, Combined Type (ADHD-CT; n?=?80), ADHD-IT with low SCT symptoms (n?=?74), and ADHD-IT with high SCT symptoms (n?=?55). These groups were compared on indicators of social and academic functioning while considering the effects of co-occurring internalizing and disruptive behavior disorders. Youth with ADHD-IT high in SCT exhibited uniquely elevated withdrawal, as well as low leadership and low peer-directed relational and overt aggression, which were not accounted for by co-occurring disorders. This high-SCT group was also the only group to have more homework problems than the ADHD-CT group, but only when other disruptive behavior disorders were absent. The distinctiveness of the high-SCT group, which was primarily evident in social as opposed to academic functioning, provides partial support for the external validity and clinical utility of SCT. 相似文献
266.
Previous work has shown that predictions can be mediated by mechanistic beliefs. The present study shows that such mediation only occurs in the face of contradictory, and not corroborative, evidence. In four experiments, we presented participants with causal statements describing a common-cause structure (E1←C→E2). Then we informed them of the states of C and E1 and asked them to judge the likelihood of E2. In Experiments 1 and 2, we manipulated whether the mechanisms supporting the two effects were the same or different, and whether the evidence presented confirmed or contradicted the participants’ expectations. The relation between the mechanisms only influenced predictions when evidence contradicted the expectations, but not when it was consistent. In Experiments 3 and 4, we used a common-cause structure with identical mechanisms. We manipulated the order in which predictions were made. When confirmatory predictions were made before contradictory predictions, mechanistic modulation was not observed in the confirmatory case. In contrast, the modulation was found when confirmatory predictions were made after contradictory ones. The results support the contradiction hypothesis that causal structure is revised during prediction, but only in the face of unexpected evidence. 相似文献
267.
Kellie M. Mullaney Shana K. Carpenter Courtney Grotenhuis Steven Burianek 《Memory & cognition》2014,42(8):1273-1284
When participants answer a test question and then receive feedback of the correct answer, studies have shown that the feedback is more effective when it is delayed by several seconds rather than provided immediately (e.g., Brackbill & Kappy, Journal of Comparative and Physiological Psychology, 55, 14–18, 1962; Schroth, Contemporary Educational Psychology, 17, 78–82, 1992). Despite several demonstrations of this delay-of-feedback benefit, a theoretical explanation for this finding has not yet been developed. The present study tested the hypothesis that brief delays of feedback are beneficial because they encourage anticipation of the upcoming feedback. In Experiment 1, participants answered obscure trivia questions, and before receiving the answer, they rated their curiosity to know the answer. The answer was then provided either immediately or after a 4-s delay. A later final test over the same questions revealed a significant delay-of-feedback benefit, but only for items that had been rated high in curiosity. Experiment 2 replicated this same effect and showed that the delay-of-feedback benefit only occurs when feedback is provided after a variable, unpredictable time duration (either 2, 4, or 8 s) rather than after a constant duration (always 4 s). These findings demonstrate that the delay-of-feedback effect appears to be greatest under conditions in which participants are curious to know the answer and when the answer is provided after an unpredictable time interval. 相似文献
268.
269.
Steven R. Smith 《South African Journal of Philosophy》2014,33(4):447-458
This paper explores an under-theorised phenomenon – the experience of melancholy as an enhancer of happiness. Drawing from philosophy and literature, I define melancholy as an experience that combines the pleasure of feeling sad with sober self-reflection. Despite expectations to the contrary, two potentially positive outcomes of melancholy are identified – insightful pensiveness, and emotional connectedness with loss and pain. These outcomes can enhance happiness as understood in key texts of contemporary Anglo-American philosophy, and, consistent with findings in psychology, also have important implications for wider debates in social policy and welfare practice. First, the pensiveness associated with melancholy can make unique contributions to personal insights, and help develop and fulfill ‘authentic happiness’ and ‘informed desires’. These contributions oppose hedonist accounts of happiness, but are conducive to enhancing happiness properly understood. Second, melancholy can also provide a psychologically safe arena for experiencing loss and pain, where a person can more positively accept the limits of the human condition. This acceptance enhances her happiness, as she is better able to live ‘in the moment’ and so derive satisfaction from her presently-orientated activities and commitments. 相似文献
270.
Absolute linguistic universals are often justified by cross‐linguistic analysis: If all observed languages exhibit a property, the property is taken to be a likely universal, perhaps specified in the cognitive or linguistic systems of language learners and users. In many cases, these patterns are then taken to motivate linguistic theory. Here, we show that cross‐linguistic analysis will very rarely be able to statistically justify absolute, inviolable patterns in language. We formalize two statistical methods—frequentist and Bayesian—and show that in both it is possible to find strict linguistic universals, but that the numbers of independent languages necessary to do so is generally unachievable. This suggests that methods other than typological statistics are necessary to establish absolute properties of human language, and thus that many of the purported universals in linguistics have not received sufficient empirical justification. 相似文献