全文获取类型
收费全文 | 518篇 |
免费 | 24篇 |
出版年
2024年 | 1篇 |
2023年 | 10篇 |
2022年 | 4篇 |
2021年 | 8篇 |
2020年 | 13篇 |
2019年 | 17篇 |
2018年 | 22篇 |
2017年 | 19篇 |
2016年 | 22篇 |
2015年 | 12篇 |
2014年 | 15篇 |
2013年 | 52篇 |
2012年 | 32篇 |
2011年 | 39篇 |
2010年 | 15篇 |
2009年 | 19篇 |
2008年 | 21篇 |
2007年 | 25篇 |
2006年 | 27篇 |
2005年 | 17篇 |
2004年 | 11篇 |
2003年 | 12篇 |
2002年 | 15篇 |
2001年 | 14篇 |
2000年 | 13篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1997年 | 11篇 |
1996年 | 9篇 |
1995年 | 6篇 |
1994年 | 7篇 |
1993年 | 10篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有542条查询结果,搜索用时 31 毫秒
461.
Arnulfo Díaz-Trujillo Joey Contreras Andrea C. Medina Gerardo A. Silveyra-Leon Anaid Antaramian Gina L. Quirarte Roberto A. Prado-Alcalá 《Neurobiology of learning and memory》2009,91(3):310-314
Interference with activity of numerous cerebral structures produces memory deficiencies; in many instances, however, when animals are over-trained such interference becomes innocuous. Systemic administration of protein synthesis inhibitors impairs long-term retention; this effect has been interpreted to mean that protein synthesis is required for memory consolidation, though little is known about the effect of protein synthesis inhibitors on memory of enhanced learning in the rat. To further analyze the protective effect of enhanced learning against amnesic treatments, groups of Wistar rats were trained in a one-trial step-through inhibitory avoidance task, using different intensities of foot-shock during training. Cycloheximide (CXM; 2.8 mg/kg), an inhibitor of protein synthesis, was injected either 30 min before training or immediately after training. Twenty-four hours after training retention latencies were recorded. Our data showed that both pre- and post-training administration of CXM produced amnesia in those groups that had been trained with relatively low foot-shock intensities, but no impairment in retention was observed when relatively high intensities of foot-shock were administered. These and similar results lead us to conclude that protein synthesis inhibitors may interfere with memory consolidation, but their effect disappears when animals are submitted to an enhanced learning experience, calling into question the idea that protein synthesis is required for memory consolidation. 相似文献
462.
The present study was aimed at assessing whether focusing attention on a task-relevant part of a word prevents processing
of its meaning. Participants performed a color-naming task on a prime word followed by lexical decision on a probe. Primes
were words, which could contain an embedded color word (e.g., “redemption”) written in an incongruent color. Probes were either semantically related (e.g., “confession”) or unrelated (e.g.,
“production”) to the prime word. A Stroop effect emerged for color words appearing either in the initial or in the final position
of the carrier word. A priming effect also emerged, with faster responses to probes semantically related to the prime. These
results are evidence that focusing attention on part of a prime (i.e., the embedded color word) does not prevent the semantic
processing of the entire word. 相似文献
463.
Roberto Arrighi Fortunato Tito Arecchi Alessandro Farini Carolina Gheri 《Cognitive processing》2009,10(1):95-99
The term perceptual bistability refers to all those conditions in which an observer looks at an ambiguous stimulus that can have two or more distinct but equally reliable interpretations. In this work, we investigate perception of Necker Cube in which bistability consists of the possibility to interpret the cube depth in two different ways. We manipulated the cube ambiguity by darkening one of the cube faces (cue) to provide a clear cube interpretation due to the occlusion depth index. When the position of the cue is stationary the cube perceived perspective is steady and driven by the cue position. However, when we alternated in time the cue position (i.e. we changed the position of the darkened cube face) two different perceptual phenomena occurred: for low frequencies the cube perspective alternated in line with the position of the cue; however for high frequencies the cue was no longer able to bias the perception but it appears as a floating feature traveling across the solid with the cube whole perspective that returns to be bistable as in the conventional, bias-free, case. 相似文献
464.
Whisker deflection is an effective conditioned stimulus (CS) for trace eyeblink conditioning that has been shown to induce a learning-specific expansion of whisker-related cortical barrels, suggesting that memory storage for an aspect of the trace association resides in barrel cortex. To examine the role of the barrel cortex in acquisition and retrieval of trace eyeblink associations, the barrel cortex was lesioned either prior to (acquisition group) or following (retention group) trace conditioning. The acquisition lesion group was unable to acquire the trace conditioned response, suggesting that the whisker barrel cortex is vital for learning trace eyeblink conditioning with whisker deflection as the CS. The retention lesion group exhibited a significant reduction in expression of the previously acquired conditioned response, suggesting that an aspect of the trace association may reside in barrel cortex. These results demonstrate that the barrel cortex is important for both acquisition and retention of whisker trace eyeblink conditioning. Furthermore, these results, along with prior anatomical whisker barrel analyses suggest that the barrel cortex is a site for long-term storage of whisker trace eyeblink associations. 相似文献
465.
Da Cunha C Wietzikoski S Wietzikoski EC Silva MH Chandler J Ferro MM Andreatini R Canteras NS 《Neurobiology of learning and memory》2007,87(4):451-463
The bilateral intranigral infusion of 1 micromol 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) in adult male Wistar rats caused a specific and partial loss of substantia nigra pars compacta (SNc) dopamine neurons, a partial depletion of striatal dopamine, and a deficit to learn the intra-maze cued version of the Morris water maze. Pre-training the SNc rats in the spatial version of the water maze or simply maintaining the animals on the water maze platform reversed this deficit. This improvement was even observed when the order of the extra-maze cues presented to the rats during pre-training of the spatial version was changed during training of the intra-maze cued version. However, this deficit was not reversed either by maintaining the animals on the platform if the spatial cues were surrounded and covered with a curtain or by swimming sessions in the maze without the escape platform and the curtain. These findings suggest that none of the following elements alone, learned during the spatial task pre-training, could help SNc rats learn the intra-maze cued task: improvement of swimming skills or knowledge of the existence of the escape platform; distance between the platform and the border of the pool; location of a particular extra-maze cue; relations among extra-maze cues. However, the simultaneous presence of the escape platform and extra-maze cues (irrespective of their relational configuration) during the pre-training sessions proved to be necessary for this improving effect to occur. 相似文献
466.
467.
Paola Ricciardelli Claudia Bonfiglioli Roberto Nicoletti Carlo Umiltà 《Psychological research》2001,65(2):98-106
In a series of five experiments we investigated whether observers could focus attention on a restricted visual area that
was demarcated by Kanizsa-like subjective contours, and whether this effect also occurred in the case of overlapping figures.
The task was a simple reaction time to a luminance increment and the basic finding was that reaction time was faster when
the imperative stimulus fell inside the focus of attention than when it fell outside. The first two experiments showed that
the extent of the attentional focus could be adapted to a region that was demarcated by subjective contours, thus extending
the results of previous studies that used regions demarcated by real contours. The last three experiments showed that, regardless
of the type of margins, focusing was more efficient for the figure that was perceived as lying in front in a pair of overlapping
figures.
Received: 21 December 1999 / Accepted: 23 August 2000 相似文献
468.
469.
470.