全文获取类型
收费全文 | 53736篇 |
免费 | 2134篇 |
国内免费 | 30篇 |
出版年
2020年 | 606篇 |
2019年 | 759篇 |
2018年 | 1099篇 |
2017年 | 1098篇 |
2016年 | 1145篇 |
2015年 | 773篇 |
2014年 | 953篇 |
2013年 | 4667篇 |
2012年 | 1705篇 |
2011年 | 1861篇 |
2010年 | 1083篇 |
2009年 | 1102篇 |
2008年 | 1682篇 |
2007年 | 1664篇 |
2006年 | 1477篇 |
2005年 | 1331篇 |
2004年 | 1303篇 |
2003年 | 1189篇 |
2002年 | 1228篇 |
2001年 | 1777篇 |
2000年 | 1676篇 |
1999年 | 1299篇 |
1998年 | 691篇 |
1997年 | 599篇 |
1996年 | 548篇 |
1995年 | 539篇 |
1994年 | 524篇 |
1993年 | 543篇 |
1992年 | 1025篇 |
1991年 | 970篇 |
1990年 | 963篇 |
1989年 | 871篇 |
1988年 | 832篇 |
1987年 | 830篇 |
1986年 | 825篇 |
1985年 | 875篇 |
1984年 | 692篇 |
1983年 | 599篇 |
1982年 | 507篇 |
1979年 | 684篇 |
1978年 | 503篇 |
1976年 | 470篇 |
1975年 | 611篇 |
1974年 | 632篇 |
1973年 | 606篇 |
1972年 | 544篇 |
1971年 | 482篇 |
1968年 | 544篇 |
1967年 | 546篇 |
1966年 | 477篇 |
排序方式: 共有10000条查询结果,搜索用时 31 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.
34.
35.
36.
37.
38.
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
39.
40.
Erin M. Leddon Sandra R. Waxman Douglas L. Medin 《The British journal of developmental psychology》2011,29(3):375-395
Previous work on children's intuitive knowledge about the natural world has documented their difficulty in acquiring an overarching concept of biological life that includes plants as well as humans and non‐human animals. It has also suggested that the acquisition of fundamental biological concepts like alive and die may be influenced by the language used to describe them, as evidenced by differences between English‐ and Indonesian‐speaking children's performance in tasks involving these concepts. Here, we examine one particularly important source of linguistic information available to children during this acquisition process: everyday conversations with their parents. We take a cross‐linguistic approach in analysing the evidence available to English‐ and Indonesian‐speaking children as they acquire meanings for words corresponding to the concepts alive and die . Our analysis illustrates that young children acquiring English and Indonesian are faced with distinct problems, but that parental input in both languages does little to support the acquisition of broad, inclusive biological concepts. 相似文献