全文获取类型
收费全文 | 1506篇 |
免费 | 97篇 |
国内免费 | 4篇 |
专业分类
1607篇 |
出版年
2023年 | 18篇 |
2022年 | 22篇 |
2021年 | 21篇 |
2020年 | 30篇 |
2019年 | 42篇 |
2018年 | 64篇 |
2017年 | 65篇 |
2016年 | 69篇 |
2015年 | 39篇 |
2014年 | 45篇 |
2013年 | 178篇 |
2012年 | 83篇 |
2011年 | 52篇 |
2010年 | 55篇 |
2009年 | 46篇 |
2008年 | 49篇 |
2007年 | 66篇 |
2006年 | 58篇 |
2005年 | 42篇 |
2004年 | 50篇 |
2003年 | 54篇 |
2002年 | 46篇 |
2001年 | 27篇 |
2000年 | 31篇 |
1999年 | 26篇 |
1998年 | 23篇 |
1997年 | 17篇 |
1996年 | 13篇 |
1995年 | 12篇 |
1994年 | 9篇 |
1993年 | 8篇 |
1992年 | 15篇 |
1991年 | 8篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 11篇 |
1987年 | 11篇 |
1985年 | 10篇 |
1984年 | 10篇 |
1982年 | 10篇 |
1981年 | 9篇 |
1979年 | 8篇 |
1977年 | 7篇 |
1976年 | 8篇 |
1975年 | 9篇 |
1973年 | 9篇 |
1971年 | 8篇 |
1970年 | 10篇 |
1968年 | 7篇 |
1967年 | 9篇 |
排序方式: 共有1607条查询结果,搜索用时 0 毫秒
891.
Practical meta-analysis of correlation matrices generally ignores covariances (and hence correlations) between correlation estimates. The authors consider various methods for allowing for covariances, including generalized least squares, maximum marginal likelihood, and Bayesian approaches, illustrated using a 6-dimensional response in a series of psychological studies concerning prediction of exercise behavior change. Quantities of interest include the overall population mean correlation matrix, the contrast between the mean correlations, the predicted correlation matrix in a new study, and the conflict between the existing studies and a new correlation matrix. The authors conclude that accounting for correlations between correlations is unnecessary when interested in individual correlations but potentially important if concerned with a composite measure involving 2 or more correlations. A simulation study indicates the asymptotic normal assumption appears reasonable. Because of potential instability in the generalized least squares methods, they recommend a model-based approach, either the maximum marginal likelihood approach or a full Bayesian analysis. 相似文献
892.
We present the case that language comprehension involves making simultaneous predictions at different linguistic levels and that these predictions are generated by the language production system. Recent research suggests that ease of comprehending predictable elements is due to prediction rather than facilitated integration, and that comprehension is accompanied by covert imitation. We argue that comprehenders use prediction and imitation to construct an "emulator", using the production system, and combine predictions with the input dynamically. Such a process helps to explain the rapidity of comprehension and the robust interpretation of ambiguous or noisy input. This framework is in line with a general trend in cognitive science to incorporate action systems into perceptual systems and has broad implications for understanding the links between language production and comprehension. 相似文献
893.
The Integrated Task Modeling Environment (ITME) is a user-friendly software tool that has been developed to automatically recode low-level data into an empirical record of meaningful task performance. The present research investigated and validated the performance of the ITME software package by conducting complex simulation missions and comparing the task analyses produced by ITME with taskanalyses produced by experienced video analysts. A very high interrater reliability (> or = .94) existed between experienced video analysts and the ITME for the task analyses produced for each mission. The mean session time:analysis time ratio was 1:24 using video analysis techniques and 1:5 using the ITME. It was concluded that the ITME produced task analyses that were as reliable as those produced by experienced video analysts, and significantly reduced the time cost associated with these analyses. 相似文献
894.
Although rumination has been proposed to play an important role in the creation of hallucinations, direct empirical tests of this proposal have not yet been performed. Employing a distinction between ruminative and reflective self-consciousness, we set out to test a new model of the relations among rumination, reflection, intrusive thoughts, thought suppression, social anxiety, and hallucination-proneness. This model proposed that rumination would be related to hallucination-proneness through the mediating variable of intrusive thoughts, but that reflection would not be related to hallucination-proneness. The model was tested in a student population (N = 296) using path analyses. A modified version of the model was found to be a good fit to the data, once a direct path from reflection to hallucination-proneness had been added. As hypothesized, rumination was related to hallucination-proneness only indirectly, through the mediating variable of intrusive thoughts. Implications for interventions and future directions for research are considered. 相似文献
895.
John Z. Sadler Fabrice Jotterand Simon Craddock Lee Stephen Inrig 《Theoretical medicine and bioethics》2009,30(6):411-425
Medicalization has been a process articulated primarily by social scientists, historians, and cultural critics. Comparatively
little is written about the role of bioethics in appraising medicalization as a social process. The authors consider what
medicalization means, its definition, functions, and criteria for assessment. A series of brief case sketches illustrate how
bioethics can contribute to the analysis and public policy discussion of medicalization. 相似文献
896.
Yukari Takarae Linda Schmidt Flora Tassone Tony J. Simon 《Cognitive, affective & behavioral neuroscience》2009,9(1):83-90
Dopamine plays a critical role in regulating neural activity in prefrontal cortex (PFC) and modulates cognition via a hypothesized
inverse U function. We investigated PFC function in children with chromosome 22q11.2 deletion syndrome (22q11.2DS) in which
one copy of catechol-O-methyltransferase (COMT) is deleted, thereby shifting them toward the lower end of dopamine turnover
on the nonlinear function. A common polymorphism with valine to methionine substitution alters COMT activity that results
in higher enzyme activity in the valine variant. Twenty-seven children with 22q11.2DS between 7 and 14 years old, and 21 age-matched
typically developing children, performed a modified version of the Attention Network Test. Children with a single valine allele
showed a reduction in response times when trials with incongruent flankers were repeated, whereas those who were hemizygous
for the methionine allele did not show the same context-based response facilitation. Our results support that a single gene,
COMT, could modulate PFC-dependent cognition. 相似文献
897.
When experiencing aggression from group members, chimpanzees commonly produce screams. These agonistic screams are graded
signals and vary acoustically as a function of the severity of aggression the caller is facing. We conducted a series of field
playback experiments with a community of wild chimpanzees in the Budongo Forest, Uganda, to determine whether individuals
could meaningfully distinguish between screams given in different agonistic contexts. We compared six subjects’ responses
to screams given in response to severe and mild aggression. Subjects consistently discriminated between the two scream types.
To address the possibility that the response differences were driven directly by the screams’ peripheral acoustic features,
rather than any attached social meaning, we also tested the subjects’ responses to tantrum screams. These screams are given
by individuals that experienced social frustration, but no physical threat, yet acoustically they are very similar to screams
of victims of severe aggression. We found chimpanzees looked longer at severe victim screams than either mild victim screams
or tantrum screams. Our results indicate that chimpanzees attend to the informational content of screams and are able to distinguish
between different scream variants, which form part of a graded continuum. 相似文献
898.
Charles C. Liu Simon G. Hosking Michael G. Lenn 《Transportation Research Part F: Traffic Psychology and Behaviour》2009,12(4):325-334
This study reports an experiment that compared the hazard perception abilities of experienced and novice motorcycle riders using an interactive, closed-loop, simulator. Participants (n = 49) were categorized into four groups: experienced motorcycle riders with full driver licence, inexperienced motorcycle riders with full driver licence, novice motorcycle riders with full driver licence, and novice motorcycle riders with probationary driver licence. The participants were tested on three scenarios, each consisting of eight hazardous events. They were instructed to ride normally, but to respond appropriately to avoid the hazards. Under certain conditions in the simulator, we found that experienced riders (relative to inexperienced or novice riders) crashed less often, received better performance evaluations, and approached hazards at more appropriate speeds. Interestingly, we also found that some novice riders were overconfident in their riding ability. We discuss how this overconfidence might be related to hazard perception. 相似文献
899.
900.
Focus particles such as only and even indicate that the focused element(s) in a sentence should be contrasted with a set of contextually defined alternatives.
Only indicates that properties assigned to the focus set are not shared by elements of the alternative set, whereas even indicates that the focus and alternative sets share the properties mentioned in the sentence. Even has the additional function of marking the focused element as being low on a scale of alternatives ranked in terms of likelihood,
thereby signaling that what is being described is somewhat surprising. Using eyetracking, we demonstrate that contrast information
associated with only and even is rapidly processed online, with effects for even being delayed, as compared with only (Experiment 1). This difference in time course was not driven by the underlying semantics of the sentence without the focus
particle (Experiment 2) but was probably due to even’s more complex semantic function. 相似文献