全文获取类型
收费全文 | 1098篇 |
免费 | 126篇 |
国内免费 | 204篇 |
专业分类
1428篇 |
出版年
2024年 | 2篇 |
2023年 | 36篇 |
2022年 | 33篇 |
2021年 | 57篇 |
2020年 | 80篇 |
2019年 | 80篇 |
2018年 | 61篇 |
2017年 | 68篇 |
2016年 | 63篇 |
2015年 | 47篇 |
2014年 | 86篇 |
2013年 | 192篇 |
2012年 | 36篇 |
2011年 | 38篇 |
2010年 | 29篇 |
2009年 | 48篇 |
2008年 | 42篇 |
2007年 | 62篇 |
2006年 | 40篇 |
2005年 | 42篇 |
2004年 | 41篇 |
2003年 | 38篇 |
2002年 | 34篇 |
2001年 | 12篇 |
2000年 | 17篇 |
1999年 | 12篇 |
1998年 | 18篇 |
1997年 | 9篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1985年 | 12篇 |
1984年 | 18篇 |
1983年 | 13篇 |
1982年 | 6篇 |
1981年 | 4篇 |
1980年 | 10篇 |
1979年 | 7篇 |
1978年 | 8篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1974年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有1428条查询结果,搜索用时 0 毫秒
71.
72.
Muscle coordination of isometric force production can be explained by a smaller number of modules. Variability in force output, however, is higher during exploratory/transient force development phases than force maintenance phase, and it is not clear whether the same modular structure underlies both phases. In this study, eight neurologically-intact adults isometrically performed target force matches in 54 directions at hands, and electromyographic (EMG) data from eight muscles were parsed into four sequential phases. Despite the varying degree of motor complexity across phases (significant between-phase differences in EMG-force correlation, angular errors, and between-force correlations), the number/composition of motor modules were found equivalent across phases, suggesting that the CNS systematically modulated activation of the same set of motor modules throughout sequential force development. 相似文献
73.
Martin Schoemann Michael Schulte‐Mecklenbeck Frank Renkewitz Stefan Scherbaum 《决策行为杂志》2019,32(5):521-535
The study of cognitive processes is built on a close mapping between three components: overt gaze behavior, overt choice, and covert processes. To validate this overt–covert mapping in the domain of decision‐making, we collected eye‐movement data during decisions between risky gamble problems. Applying a forward inference paradigm, participants were instructed to use specific decision strategies to solve those gamble problems (maximizing expected values or applying different choice heuristics) during which gaze behavior was recorded. We revealed differences between overt behavior, as indicated by eye movements, and covert decision processes, instructed by the experimenter. However, our results show that the overt–covert mapping is for some eye‐movement measures not as close as expected by current decision theory, and hence question reverse inference as being prone to fallacies due to a violation of its prerequisite, that is, a close overt–covert mapping. We propose a framework to rehabilitate reverse inference. 相似文献
74.
75.
家庭游戏中的母亲控制策略与儿童顺从行为 总被引:4,自引:0,他引:4
以42个3岁儿童及其母亲为被试,考察在家庭自由游戏中母亲的控制策略和儿童的顺从行为之间的关系。结果表明:(1)在亲子交往中,母亲使用直接命令的频次最多,间接命令次之,否定控制最少。(2)3岁儿童对母亲控制的顺从率为56.1%;在儿童的不顺从行为中,无技巧不顺从占优势,其中消极不顺从的频次最多。(3)母亲的弱控制策略与儿童的顺从行为相关最高;强控制策略与儿童的无技巧不顺从相关最高。(4)在儿童不顺从时,母亲的弱控制策略容易导致儿童的顺从行为,强控制策略则容易导致儿童的情境性顺从行为。 相似文献
76.
The question of independently controlled components in the act of reaching and grasping has attracted interest experimentally and theoretically. Data from 35 studies were recently found consistent with simulated kinematic finger and thumb trajectories optimised for minimum jerk. The present study closely reproduces those trajectories using a discrete-time model based on minimum acceleration. That model was further used to generate two-dimensional trajectories for finger and thumb to reach and grasp an elliptical object with varying position and/or orientation. Orthogonalisation of these four trajectories revealed one degree of freedom when direction of reach was constant and two degrees of freedom when direction of reach varied, irrespective of object distance and orientation. These simulations indicate that reach and grasp movements contain redundancy that is removable by formation of task-dependent synergies. As skilled movement can be planned and executed in a low dimension workspace, control of these independent components lessens central workload. 相似文献
77.
Hurewitz F Brown-Schmidt S Thorpe K Gleitman LR Trueswell JC 《Journal of psycholinguistic research》2000,29(6):597-626
Two experiments are reported which examine children's ability to use referential context when making syntactic choices in language production and comprehension. In a recent on-line study of auditory comprehension, Trueswell, Sekerina, Hill, and Logrip (1999) examined children's and adults' abilities to resolve temporary syntactic ambiguities involving prepositional phrases (e.g., “Put the frog on the napkin into ¨”). Although adults and older children used the referential context to guide their initial analysis (pursuing a destination interpretation in a one-frog context and a modifier interpretation in a two-frog context), 4 to 5-year olds' initial and ultimate analysis was one of destination, regardless of context. The present studies examined whether these differences were attributable to the comprehension process itself or to other sources, such as possible differences in how children perceive the scene and referential situation. In both experiments, children were given a language generation task designed to elicit and test children's ability to refer to a member of a set through restrictive modification. This task was immediately followed by the “put” comprehension task. The findings showed that, in response to a question about a member of a set (e.g., “Which frog went to Mrs. Squid's house?”), 4- to 5-year-olds frequently produced a definite NP with a restrictive prepositional modifier (e.g., “The one on the napkin”). These same children, however, continued to misanalyze put instructions, showing a strong avoidance of restrictive modification during comprehension. Experiment 2 showed that an increase in the salience of the platforms that distinguished the two referents increased overall performance, but still showed the strong asymmetry between production and comprehension. Eye movements were also recorded in Experiment 2, revealing on-line parsing patterns similar to Trueswell et al.: an initial preference for a destination analysis and a failure to revise early referential commitments. These experiments indicate that child–adult differences in parsing preferences arise, in part, from developmental changes in the comprehension process itself and not from a general insensitivity to referential properties of the scene. The findings are consistent with a probabilistic model for uncovering the structure of the input during comprehension, in which more reliable linguistic and discourse-related cues are learned first, followed by a gradually developing ability to take into account other more uncertain (or more difficult to learn) cues to structure. 相似文献
78.
79.
Lea DH 《Journal of genetic counseling》1999,8(3):175-181
Genetic counseling and the many roles a genetic counselor must assume to provide quality genetic health care are becoming increasingly complex, especially when the genetic condition is rare, and DNA testing is costly and not yet routinely used. A case study of a couple with a family history of retinoblastoma and their pursuit of DNA testing for prenatal diagnosis is presented. The case study illustrates the instrumental role of the genetic counselor in advocating for clients for genetic services such as DNA testing and in educating insurance companies in the nature and importance of such services to achieve improved client health care outcomes. 相似文献
80.
Hirokazu Yoshimura 《The Japanese psychological research》1999,41(3):143-152
In this article, mechanisms of perceptual adaptation to the transposed world are analyzed based on introspective and behavioral performance data gathered during an extended period of wearing left-right reversing goggles. Three aspects central to this study were the mental map of the living space surrounding the subject, body image (both seen and felt), and the sensorimotor coordination system, which reflects the relationship between the subject and surroundings. These were investigated through map-drawing tests, self-representation tests when postures other than face forward were adopted, and after effects observed immediately after removal of the reversing goggles. It was concluded that the main course of the perceptual adaptation to the visually left-right reversed world consists of double reversals of the mental map and body image as well as the establishment of a new sensorimotor coordination system. In sharp contrast to the proprioceptive-change hypothesis, the importance of the visual nature of the body image was emphasized. 相似文献