全文获取类型
收费全文 | 586篇 |
免费 | 24篇 |
专业分类
610篇 |
出版年
2023年 | 2篇 |
2022年 | 5篇 |
2021年 | 17篇 |
2020年 | 9篇 |
2019年 | 14篇 |
2018年 | 16篇 |
2017年 | 20篇 |
2016年 | 14篇 |
2015年 | 8篇 |
2014年 | 12篇 |
2013年 | 64篇 |
2012年 | 20篇 |
2011年 | 27篇 |
2010年 | 13篇 |
2009年 | 20篇 |
2008年 | 25篇 |
2007年 | 25篇 |
2006年 | 23篇 |
2005年 | 32篇 |
2004年 | 18篇 |
2003年 | 32篇 |
2002年 | 28篇 |
2001年 | 13篇 |
2000年 | 11篇 |
1999年 | 11篇 |
1998年 | 13篇 |
1997年 | 9篇 |
1996年 | 10篇 |
1995年 | 3篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 7篇 |
1989年 | 8篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 5篇 |
1984年 | 5篇 |
1983年 | 6篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1975年 | 4篇 |
1972年 | 2篇 |
1967年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有610条查询结果,搜索用时 8 毫秒
541.
Hotermans C Peigneux P Maertens de Noordhout A Moonen G Maquet P 《Learning & memory (Cold Spring Harbor, N.Y.)》2006,13(5):580-583
Motorskill learning is a dynamic process that continues covertly after training has ended and eventually leads to delayed increments in performance. Current theories suggest that this off-line improvement takes time and appears only after several hours. Here we show an early transient and short-lived boost in performance, emerging as early as 5-30 min after training but no longer observed 4 h later. This early boost is predictive of the performance achieved 48 h later, suggesting its functional relevance for memory processes. 相似文献
542.
Does the mastery of center-embedded linguistic structures distinguish humans from nonhuman primates?
In a recentScience article, Fitch and Hauser (2004; hereafter, F&H) claimed to have demonstrated that cotton-top tamarins fail to learn an artificial
language produced by a phrase structure grammar (Chomsky, 1957) generating center-embedded sentences, whereas adult humans
easily learn such a language. We report an experiment replicating the results of F&H in humans but also showing that subjects
learned the language without exploiting in any way the center-embedded structure. When the procedure was modified to make
the processing of this structure mandatory, the subjects no longer showed evidence of learning. We propose a simple interpretation
for the difference in performance observed in F&H’s task between humans and tamarins and argue that, beyond the specific drawbacks
inherent in F&H’s study, researching the source of the inability of nonhuman primates to master language within a framework
built around Chomsky’s hierarchy of grammars is a conceptual dead end. 相似文献
543.
Wietrzych M Meziane H Sutter A Ghyselinck N Chapman PF Chambon P Krezel W 《Learning & memory (Cold Spring Harbor, N.Y.)》2005,12(3):318-326
Retinoid signaling has been recently shown to be required for mnemonic functions in rodents. To dissect the behavioral and molecular mechanisms involved in this requirement, we have analyzed the spatial and recognition working memory in mice carrying null mutations of retinoid receptors RARbeta and RXRgamma. Double mutants appeared deficient in spatial working memory as tested in spontaneous alternation in the Y-maze and delayed nonmatch to place (DNMTP) test in the T-maze. These mutant mice did acquire, however, spatial place reference or right/left discrimination tasks in the T-maze set-up, indicating that basic sensorimotor functions, spatial orientation, and motivational factors are unlikely to account for deficits in working memory-sensitive tasks. Double-mutant mice were also deficient in novel object recognition at intermediate, but not short delays. RXRgamma appeared to be the functionally predominant receptor in modulation of the working memory, as RXRgamma, but not RARbeta single null mutant mice exhibited deficits similar to those observed in the double mutants. The mechanism of this modulation is potentially related to functions of RXRgamma in frontal and perirhinal cortex, structures in which we detected RXRgamma expression and which are functionally implicated in working memory processes. 相似文献
544.
Working memory (WM) span tasks involving a complex activity performed concurrently with item retention have proven to be good
predictors of high-level cognitive performance. The present study demonstrates that replacing these complex self-paced activities
with simpler but computer-paced processes, such as reading successive letters, yields more predictive WM span measures. This
finding suggests that strategic factors do not contribute to be relationship between WM spans and high-level cognition. 相似文献
545.
This study investigated African self-consciousness and Black racial identity as predictors of psychological distress and self-esteem for Black men. One hundred thirty Black men from a college and community sample completed the African Self-Consciousness Scale, the Racial Identity Attitude Scale-B, the Symptom Checklist 90-Revised, and the Coopersmith Self-Esteem Inventory. Canonical correlation analysis found 2 significant roots with the 1st root indicating that Black men whose attitudes reflected Preencounter and Immersion racial identity attitudes and who do not resist against anti-African/Black forces reported greater psychological distress and less esteem. Results from the 2nd root suggested that Black men whose attitudes reflect greater Internalization racial identity attitudes, greater resistance to anti-African/Black forces, and less identification with Blacks reported greater self-esteem. 相似文献
546.
A dual-task procedure was used to investigate the attentional requirements of number processing. The results show that (1) numeric information in Task 2 can be retrieved in parallel with capacity-demanding processing in Task 1 but (2) comparing two quantities requires central capacity, which is depleted by switching from one task to another. This finding resolves an apparent discrepancy in the literature, in which digit magnitude information has not been retrieved in parallel with a second task (Logan & Schulkind, 2000), despite repeated demonstrations that this information is retrieved autonomously, even when it is deleterious to performance (Henik & Tzelgov, 1982). A model is proposed to reconcile existing findings with the new ones revealed in the present investigation. 相似文献
547.
Stip E Sepehry AA Prouteau A Briand C Nicole L Lalonde P Lesage A 《Brain and cognition》2005,59(3):292-295
BACKGROUND: Schizophrenia (SZ) and schizoaffective disorders (SA) are associated with cognitive deficits. Generally, a schizoaffective diagnosis is associated with better prognosis on the level of social integration. It is also well established that cognition is an important factor for good social outcome in schizophrenia. We hypothesized that, although patients suffering from SA share symptoms with SZ, they can be differentiated on the basis of neurocognitive function and that SA perform better in several domains. METHOD: Performances of two groups SA (N = 13) and SZ (N = 44) were compared on several visual-motor tasks using CANTAB [Motor Screening (MOT), Reaction Time (RTI), Paired Associates Learning Task (PAL), and Stockings of Cambridge items (SOC)]. The two groups were matched for symptom severity. ANOVA with repeated measures was employed to determine whether any difference in cognitive scores during a 2-year period was significantly related to the diagnostic status. RESULTS: A significant and durable difference was observed between SZ and SA on motor screening and explicit memory tests where SA performed better. CONCLUSION: Neurocognitive tests may be relevant for distinguishing schizoaffective from schizophrenia, chiefly via tests tapping into visuo-spatial and visuo-motor coordination abilities (e.g., paired associated learning and motor screening). 相似文献
548.
We propose that the isomorphism generally observed between the representations composing our momentary phenomenal experience and the structure of the world is the end-product of a progressive organization that emerges thanks to elementary associative processes that take our conscious representations themselves as the stuff on which they operate, a thesis that we summarize in the concept of Self-Organizing Consciousness (SOC). 相似文献
549.
550.
Martha C. Tompson Claudette B. Pierre Kathryn Dingman Boger James W. McKowen Priscilla T. Chan Rachel D. Freed 《Journal of abnormal child psychology》2010,38(1):105-117
Across development, maternal depression has been found to be a risk factor for youth psychopathology generally and youth depression
specifically. Maternal Expressed Emotion (EE) has been examined as a predictor of outcome among youth with depression. The
present study explored the associations between youth psychopathology and two predictors–maternal depression within the child’s
lifetime and maternal EE–in a study of children at risk for depression. One hundred and seventy-one youth, ages 8–12, and
their mothers participated. To assess maternal and youth psychopathology, dyads were administered structured diagnostic assessments,
and mothers and children completed self-report measures of their own depressive symptoms. In addition, mothers completed the
Achenbach Child Behavior Checklist–Parent Report Version (CBCL) for their children. Maternal EE was assessed based on the
Five Minute Speech Sample. History of maternal depression was associated with high maternal EE, and the combination of maternal
depression history and maternal EE was associated with children’s own reports of higher depressive symptoms. Current maternal
depressive symptoms were associated with mothers’ reports of children’s Internalizing scores on the CBCL, and maternal depression
history, current maternal depressive symptoms, and maternal EE were strongly associated with mothers’ reports of children’s
Externalizing and Total Problem scores on the CBCL. History of maternal depression and a rating of high or borderline Critical
EE (characterized by maternal critical comments and/or reports of a negative relationship) were independently associated with
children’s depression diagnoses. 相似文献