全文获取类型
收费全文 | 52466篇 |
免费 | 2092篇 |
国内免费 | 30篇 |
出版年
2020年 | 587篇 |
2019年 | 739篇 |
2018年 | 1063篇 |
2017年 | 1057篇 |
2016年 | 1115篇 |
2015年 | 744篇 |
2014年 | 916篇 |
2013年 | 4552篇 |
2012年 | 1656篇 |
2011年 | 1808篇 |
2010年 | 1053篇 |
2009年 | 1079篇 |
2008年 | 1644篇 |
2007年 | 1622篇 |
2006年 | 1423篇 |
2005年 | 1296篇 |
2004年 | 1272篇 |
2003年 | 1160篇 |
2002年 | 1202篇 |
2001年 | 1759篇 |
2000年 | 1657篇 |
1999年 | 1266篇 |
1998年 | 664篇 |
1997年 | 573篇 |
1996年 | 519篇 |
1995年 | 519篇 |
1994年 | 501篇 |
1993年 | 521篇 |
1992年 | 1015篇 |
1991年 | 961篇 |
1990年 | 945篇 |
1989年 | 856篇 |
1988年 | 819篇 |
1987年 | 804篇 |
1986年 | 808篇 |
1985年 | 859篇 |
1984年 | 676篇 |
1983年 | 585篇 |
1982年 | 477篇 |
1979年 | 665篇 |
1978年 | 496篇 |
1976年 | 451篇 |
1975年 | 600篇 |
1974年 | 627篇 |
1973年 | 600篇 |
1972年 | 546篇 |
1971年 | 478篇 |
1968年 | 541篇 |
1967年 | 544篇 |
1966年 | 479篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
A. G. Baker Hannah Steinwald Mark E. Bouton 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1991,43(2):199-218
In three experiments we studied the relationship between contextual conditioning and the reinstatement of extinguished lever pressing that occurs when noncontingent food is introduced following extinction. In all three experiments the non-contingent food was presented off-baseline (with the response levers not present). On subsequent tests, with the response levers present, animals that had been exposed to food showed more reinstatement of lever pressing than control animals. This finding rules out alternative mechanisms for the reinstated responding that rely on the interaction of non-contingent food and responding, such as superstitious reinforcement or the discriminative after-effects of food. In addition, in each experiment we demonstrated that manipulations known to affect contextual conditioning (signalling the food in Experiment 1, context extinction in Experiment 2, and switching contexts in Experiment 3) reduced the reinstatement. These results are consistent with the claim that contextual conditioning is important in controlling instrumental conditioning and closely parallel findings concerning the reinstatement of Pavlovian responsing following extinction. 相似文献
32.
33.
One possible explanation for the association between Cook-Medley Hostility Scale (Ho Scale; W. W. Cook & D. M. Medley, 1954) scores and premature coronary artery disease (CAD) morbidity and mortality is that hostile persons also have elevations on CAD risk factors. Meta-analyses with fixed and random-effects models were used to evaluate the relationship between Ho Scale scores and CAD risk factors in the empirical literature. Ho Scale scores were significantly related to body mass index, waist-to-hip ratio, insulin resistance, lipid ratio, triglycerides, glucose, socioeconomic status (SES), alcohol consumption, and smoking. Although there was also heterogeneity among study outcomes, the results of conservative random effects models provide confidence in the obtained relationships. On the basis of available evidence, researchers might give attention to obesity, insulin resistance, damaging health behaviors, and SES as potential contributing factors in understanding the association between Ho Scale scores and CAD. 相似文献
34.
35.
36.
37.
38.
39.
Gavin N. Rackoff Daniel W. Lagoni Mia F. Shoshany Nasreen A. Moursi Laura Hennefield 《The British journal of developmental psychology》2022,40(1):170-186
By roughly 6 years of age, children acquire the stereotype that men are more competent than women in science, technology, engineering, and mathematics (STEM), potentially leading to greater trust in scientific information provided by men. This study tested whether 3- to 8-year-old children differentially endorsed conflicting information about science and toys presented by male and female informants depicted as a ‘man’ and ‘woman’ (Exp1) or ‘scientists’ (Exp2). Children were expected to endorse toy testimony from gender-matched informants; thus, the key question concerned endorsement of science testimony. In Exp1 (N = 149), boys and girls showed a same-gender informant preference for toy testimony; however, girls endorsed the male informant's testimony more for science than for toys – but only when tested by a male experimenter. In Exp2 (N = 264), boys and girls showed a same-gender preference, irrespective of content. Findings suggest that STEM-related gender stereotypes might lead girls to trust scientific information presented by men over women in certain contexts. 相似文献
40.