全文获取类型
收费全文 | 389篇 |
免费 | 14篇 |
专业分类
403篇 |
出版年
2021年 | 3篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2018年 | 12篇 |
2017年 | 10篇 |
2016年 | 8篇 |
2015年 | 3篇 |
2014年 | 7篇 |
2013年 | 36篇 |
2012年 | 20篇 |
2011年 | 5篇 |
2009年 | 9篇 |
2008年 | 12篇 |
2007年 | 13篇 |
2006年 | 10篇 |
2005年 | 6篇 |
2004年 | 9篇 |
2003年 | 8篇 |
2002年 | 12篇 |
2001年 | 21篇 |
2000年 | 8篇 |
1999年 | 11篇 |
1998年 | 6篇 |
1997年 | 14篇 |
1995年 | 6篇 |
1994年 | 4篇 |
1993年 | 7篇 |
1992年 | 6篇 |
1991年 | 7篇 |
1990年 | 8篇 |
1989年 | 6篇 |
1988年 | 14篇 |
1987年 | 5篇 |
1986年 | 8篇 |
1985年 | 2篇 |
1984年 | 9篇 |
1982年 | 4篇 |
1980年 | 3篇 |
1979年 | 6篇 |
1978年 | 8篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1972年 | 3篇 |
1971年 | 7篇 |
1970年 | 4篇 |
1969年 | 2篇 |
1967年 | 5篇 |
1966年 | 3篇 |
排序方式: 共有403条查询结果,搜索用时 8 毫秒
151.
The attention network test (ANT) is a brief computerized battery measuring three independent behavioral components of attention: Conflict resolution (ability to overcome distracting stimuli), spatial Orienting (the benefit of valid spatial pre-cues), and Alerting (the benefit of temporal pre-cues). Imaging, clinical, and behavioral evidence demonstrate hemispheric asymmetries in these attentional networks. We constructed a lateralized version of the ANT (LANT), with brief targets flashed in one or the other visual hemifield. We also modified the tests by including invalid spatial cues in order to measure the cost component of Orienting. In a series of experiments, we investigated the efficiency of the attention networks separately in each hemisphere. Participants exhibited significant estimates of all networks measured by the LANT, comparable to the ANT. The three networks were represented in each hemisphere separately and were largely comparable across the two hemispheres. We suggest that the LANT is an informative extension of the original ANT, allowing for measurement of the three attention networks in each hemisphere separately. 相似文献
152.
The ability to retain and manipulate information for brief periods of time is crucial for proficient cognitive functioning
but working memory (WM) is susceptible to disruption by irrelevant speech. Music may also be detrimental, but its impact on
WM is not clear. This study assessed the effects of vocal music, equivalent instrumental music, and irrelevant speech on WM
in order to clarify what aspect of music affects performance and the degree of impairment. To study this, 60 college students
completed WM tests (digit span) in the presence of irrelevant speech, vocal music, instrumental (karaoke) versions of the
vocal music, and silence. As expected, both speech and vocal music degraded performance. WM performance with instrumental
music was better than with vocal music but not significantly different from either silence or speech. Familiarity with song
lyrics had little effect on performance. People were poor judges of the degree of memory impairment resulting from various
irrelevant sounds.
This study was reviewed and approved by the Clemson University Institutional Review Board. 相似文献
153.
Recognition of natural scenes from global properties: seeing the forest without representing the trees 总被引:1,自引:0,他引:1
Human observers are able to rapidly and accurately categorize natural scenes, but the representation mediating this feat is still unknown. Here we propose a framework of rapid scene categorization that does not segment a scene into objects and instead uses a vocabulary of global, ecological properties that describe spatial and functional aspects of scene space (such as navigability or mean depth). In Experiment 1, we obtained ground truth rankings on global properties for use in Experiments 2-4. To what extent do human observers use global property information when rapidly categorizing natural scenes? In Experiment 2, we found that global property resemblance was a strong predictor of both false alarm rates and reaction times in a rapid scene categorization experiment. To what extent is global property information alone a sufficient predictor of rapid natural scene categorization? In Experiment 3, we found that the performance of a classifier representing only these properties is indistinguishable from human performance in a rapid scene categorization task in terms of both accuracy and false alarms. To what extent is this high predictability unique to a global property representation? In Experiment 4, we compared two models that represent scene object information to human categorization performance and found that these models had lower fidelity at representing the patterns of performance than the global property model. These results provide support for the hypothesis that rapid categorization of natural scenes may not be mediated primarily though objects and parts, but also through global properties of structure and affordance. 相似文献
154.
155.
156.
157.
A popular program among consumer action groups involves publicizing comparative food price information (CFPI) gathered from retail stores. Its significance is based on the assumption that publishing CFPI maximizes retail competition (i.e., moderates price levels or price increases) and occasions more frugal store selections among consumers. We tested these assumptions during a 2-year analysis. Specifically, we monitored the prices of two distinct market baskets in the supermarkets of two midwestern cities (target and contrast cities). Following a lengthy baseline, we published the prices of only one of the market baskets at stores in the target city in the local newspaper on five different occasions. The results suggested that reductions in price inflation occurred for both market baskets at the independently operated target stores. The corporate chain stores were not similarly affected. In addition, surveys indicated that many consumers used the CFPI as a basis for store selection. Finally, the analysis included a discussion of the politics, economics, and future of CFPI programs. 相似文献
158.
We investigated performance on implicit and explicit memory tasks in subjects diagnosed with major depression and matched controls. Depressed subjects showed impaired performance on both the explicit and implicit tasks in comparison with controls. These findings are in contrast to groups such as amnesic patients and older adults, who show preserved abilities on implicit tasks and deficits on explicit tasks. 相似文献
159.
Dr. F. Gordon Greene 《Journal of Near-Death Studies》1992,10(4):205-231
In this paper I match phenomena associated with the passage into otherworlds as reported during out-of-body and near-death experiences, with imagery associated with the passage into otherworlds as depicted in classic modern fantasies and fairy tales. Both sources include sensations of consciousness separating from the body, floating and flying, passage through fluidic spaces or dark tunnels toward bright lights, and emergence into supernatural worlds inhabited by souls of the deceased and by higher spiritual beings; and both describe comparable psychophysical intiatory factors. I introduce a metaphysically neutral depth psychology to explain these parallels, examine two metaphysically opposed extensions to this depth psychology, and consider several implications of a transcendental perspective.Mr. Greene is a free-lance writer whose principal interests have been parapsychology, religion, and metaphysics 相似文献
160.
An unobtrusive observation system was developed to determine the extent to which dental professionals in two communities provided lead shielding to patients during X-ray exams. A lengthy baseline revealed low and irregular provision of shielding among half of these professionals. Subsequently, a program was undertaken by a consumer's group in which these professionals were requested to provide shielding and were given confidential feedback regarding its use during the baseline period. The provision of shielding dramatically increased at all offices and was maintained throughout a follow-up period extending to more than 9 months after the program's implementation. Little or no generalized effect was observed in the occurrence of three collateral behaviors that were also assessed throughout the study. 相似文献