首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   101114篇
  免费   3988篇
  国内免费   60篇
  105162篇
  2019年   1219篇
  2018年   1693篇
  2017年   1779篇
  2016年   1834篇
  2015年   1334篇
  2014年   1584篇
  2013年   7675篇
  2012年   2884篇
  2011年   3144篇
  2010年   2030篇
  2009年   1982篇
  2008年   2811篇
  2007年   2751篇
  2006年   2553篇
  2005年   2229篇
  2004年   2072篇
  2003年   2045篇
  2002年   2119篇
  2001年   3143篇
  2000年   3054篇
  1999年   2337篇
  1998年   1185篇
  1997年   1068篇
  1996年   1044篇
  1992年   2001篇
  1991年   1878篇
  1990年   1842篇
  1989年   1711篇
  1988年   1672篇
  1987年   1637篇
  1986年   1705篇
  1985年   1774篇
  1984年   1487篇
  1983年   1300篇
  1982年   975篇
  1981年   990篇
  1979年   1564篇
  1978年   1151篇
  1977年   1003篇
  1976年   980篇
  1975年   1321篇
  1974年   1465篇
  1973年   1600篇
  1972年   1285篇
  1971年   1223篇
  1970年   1105篇
  1969年   1173篇
  1968年   1437篇
  1967年   1285篇
  1966年   1239篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
We investigated eye‐movements during preschool children's pictorial recall of seen objects. Thirteen 3‐ to 4‐year‐old children completed a perceptual encoding and a pictorial recall task. First, they were exposed to 16 pictorial objects, which were positioned in one of four distinct areas on the computer screen. Subsequently, they had to recall these pictorial objects from memory in order to respond to specific questions about visual details. We found that children spent more time fixating the areas in which the pictorial objects were previously displayed. We conclude that as early as age 3–4 years old, children show specific eye‐movements when they recall pictorial contents of previously seen objects.  相似文献   
32.
33.
Previous research demonstrates that older adults are poor at dual tasking, but there is less agreement on whether their decrement is worse than that predicted from single-task performance. This study investigated whether task domain moderates dual-task costs in old age. In two experiments, young and older adults retrieved either previously learned associates (episodic retrieval) or overlearned category members (semantic retrieval) under single or working-memory load conditions, using cued recall (Experiment 1) and recognition (Experiment 2) procedures. In both experiments the proportional costs of dual tasking were age invariant for semantic retrieval but were particularly marked for episodic retrieval, although the size of the age effect was reduced in recognition compared to cued recall. The data suggest that age effects in dual tasking may be domain specific.  相似文献   
34.
35.
36.
37.
38.
39.
40.
Two studies tested the hypothesis that certain positive emotions speed recovery from the cardiovascular sequelae of negative emotions. In Study 1, 60 subjects (Ss) viewed an initial fear-eliciting film, and were randomly assigned to view a secondary film that elicited: (a) contentment; (b) amusement; (c) neutrality; or (d) sadness. Compared to Ss who viewed the neutral and sad secondary films, those who viewed the positive films exhibited more rapid returns to pre-film levels of cardiovascular activation. In Study 2, 72 Ss viewed a film known to elicit sadness. Fifty Ss spontaneously smiled at least once while viewing this film. Compared to Ss who did not smile, those who smiled exhibited more rapid returns to pre-film levels of cardiovascular activation. We discuss these findings in terms of emotion theory and possible health-promoting functions of positive emotions.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号