全文获取类型
收费全文 | 225篇 |
免费 | 23篇 |
专业分类
248篇 |
出版年
2023年 | 2篇 |
2021年 | 6篇 |
2020年 | 2篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 10篇 |
2014年 | 19篇 |
2013年 | 15篇 |
2012年 | 18篇 |
2011年 | 15篇 |
2010年 | 12篇 |
2009年 | 8篇 |
2008年 | 10篇 |
2007年 | 22篇 |
2006年 | 12篇 |
2005年 | 13篇 |
2004年 | 10篇 |
2003年 | 6篇 |
2002年 | 8篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1985年 | 1篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1974年 | 1篇 |
1973年 | 3篇 |
1969年 | 1篇 |
1965年 | 1篇 |
1923年 | 1篇 |
1892年 | 1篇 |
排序方式: 共有248条查询结果,搜索用时 15 毫秒
241.
Human decisions are based on accumulating evidence over time for different options. Here we ask a simple question: How is the accumulation of evidence affected by the level of awareness of the information? We examined the influence of awareness on decision-making using combined behavioral methods and magneto-encephalography (MEG). Participants were required to make decisions by accumulating evidence over a series of visually presented arrow stimuli whose visibility was modulated by masking. Behavioral results showed that participants could accumulate evidence under both high and low visibility. However, a top-down strategic modulation of the flow of incoming evidence was only present for stimuli with high visibility: once enough evidence had been accrued, participants strategically reduced the impact of new incoming stimuli. Also, decision-making speed and confidence were strongly modulated by the strength of the evidence for high-visible but not low-visible evidence, even though direct priming effects were identical for both types of stimuli. Neural recordings revealed that, while initial perceptual processing was independent of visibility, there was stronger top-down amplification for stimuli with high visibility than low visibility. Furthermore, neural markers of evidence accumulation over occipito-parietal cortex showed a strategic bias only for highly visible sensory information, speeding up processing and reducing neural computations related to the decision process. Our results indicate that the level of awareness of information changes decision-making: while accumulation of evidence already exists under low visibility conditions, high visibility allows evidence to be accumulated up to a higher level, leading to important strategical top-down changes in decision-making. Our results therefore suggest a potential role of awareness in deploying flexible strategies for biasing information acquisition in line with one''s expectations and goals. 相似文献
242.
Patrick Edery Tania Attié Lois M. Mulligan Anna Pelet Charis Eng Brace A. J. Ponder Arnold Munnich Stanislas Lyonnet 《Human genetics》1994,94(5):579-580
A novel polymorphism in the coding sequence of the human RET proto-oncogene is described. The RET proto-oncogene maps to chromosome 10q11.2, and is involved in multiple endocrine neoplasia (MEN 2A, MEN 2B), familial medullary thyroid carcinoma and Hirschsprung's disease. 相似文献
243.
One striking property of perception is that it can be achieved in two seemingly different ways: either consciously or non-consciously. What distinguishes these two types of processing at the neural level? So far, empirical findings suggest that conscious perception is associated with an increase in activity at the sensory level, the specific involvement of a fronto-parietal network and an increase in long-distance functional connectivity and synchrony within a broad network of areas. We interpret these data in the framework of the global neuronal workspace model which proposes that the neural basis of conscious access is a sudden self-amplifying process leading to a global brain-scale pattern of activity. In contradiction with several theories which assume that there is a continuum of perception, associated with a gradual change in the intensity of brain activation, the model predicts a sharp non-linear transition between non-conscious and conscious processing. 相似文献
244.
245.
Michel Giollant Suzanne Bertrand Pierre Verrelle Stanislas du Manoir Thomas Ried Françoise Mornex Jean-François Doré Thomas Cremer P. Malet A Tchirkov 《Human genetics》1996,98(3):265-270
The presence of double minute chromosomes (dmin) in cancer cells is known to be correlated with gene amplifications. In human
high grade astrocytomas or glioblastomas, about 50% of cytogenetically characterized cases display dmin. G5 is a cell line
which has been established from a human glioblastoma containing multiple dmin. In order to identify the DNA content of these
dmin, three techniques were successively used: conventional cytogenetic analysis, comparative genomic hybridization (CGH),
and fluorescent in situ hybridization (FISH). The karyotype of G5 cells showed numerical chromosome changes (hypertriploidy),
several marker chromosomes, and multiple dmin. CGH experiments detected two strong DNA amplification areas located in 9p21-22
and 9p24, as well as an underrepresentation of chromosomes 6, 10, 11, 13, 14, and 18q. By using FISH with a chromosome 9-specific
painting probe to metaphase chromosomes of the G5 cell line, dmin were shown to contain DNA sequences originating from chromosome
9. This study demonstrates the usefulness of a combination of classical karyotyping, CGH, and FISH to identify the chromosomal
origin of amplified DNA sequences in dmin.
Received: 30 October 1994 / Revised: 25 February 1996 相似文献
246.
Sylvie Grandemange Sophie Schaller Shigeru Yamano Stanislas Du Manoir George V Shpakovski Marie-Geneviève Mattei Claude Kedinger Marc Vigneron 《BMC molecular biology》2001,2(1):14
Background
The sequences encoding the yeast RNA polymerase II (RPB) subunits are single copy genes. 相似文献247.
248.