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   50690篇
  免费   2019篇
  国内免费   31篇
  2020年   532篇
  2019年   629篇
  2018年   944篇
  2017年   926篇
  2016年   937篇
  2015年   642篇
  2014年   815篇
  2013年   3833篇
  2012年   1427篇
  2011年   1581篇
  2010年   968篇
  2009年   1032篇
  2008年   1388篇
  2007年   1344篇
  2006年   1259篇
  2005年   1084篇
  2004年   1013篇
  2003年   1043篇
  2002年   953篇
  2001年   1826篇
  2000年   1783篇
  1999年   1323篇
  1998年   577篇
  1997年   496篇
  1996年   468篇
  1992年   1115篇
  1991年   1050篇
  1990年   1054篇
  1989年   955篇
  1988年   898篇
  1987年   892篇
  1986年   872篇
  1985年   982篇
  1984年   774篇
  1983年   622篇
  1982年   490篇
  1979年   750篇
  1978年   574篇
  1977年   504篇
  1976年   478篇
  1975年   676篇
  1974年   718篇
  1973年   786篇
  1972年   631篇
  1971年   525篇
  1970年   484篇
  1969年   527篇
  1968年   639篇
  1967年   561篇
  1966年   618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.
Evaluated the effect of varied physician affect on subject recall, anxiety, and perceptions in a simulated tense and ambiguous medical situation. Forty women at risk for breast cancer viewed videotapes of an oncologist presenting--with either worried or nonworried affect--mammogram results. Although the mammogram results and the oncologist were the same in both presentation, analyses indicated that, compared to the women receiving the results from a nonworried physician, the women receiving the results from a worried physician recalled significantly less information, perceived the clinical situation as significantly more severe, reported significantly higher levels of state anxiety, and had significantly higher pulse rates. These results suggest that physician affect plays a critical role in patient reaction to medical information. Implications for compliance research, patient satisfaction, and physician training are discussed.  相似文献   
34.
35.
Convergent and divergent stereo mechanisms were compared in their ability to recover structure from motion. Contrary to a recent result reported by Richards and Lieberman, no difference in their performance was found; both mechanisms appeared equally capable of supporting the perception of good structure from motion. Possible reasons for the disparate results are discussed.  相似文献   
36.
37.
38.
39.
P Bressan 《Perception》1987,16(5):671-675
If a few parallel horizontal rows of dots are set diagonally, like steps, across the visual field, the inner rows appear not to be horizontal but sloping up to one side; the effect holds as long as the vertical distances between the rows do not exceed a given visual angle. This illusion, described by Vicario in 1978, was never explained. An experiment is reported in which the illusion was still visible at row separations well in excess of the spatial limits originally considered, provided the stimulus elements were enlarged. The maximum illusion was obtained for length ratios (interrow distance to size of dots) identical to those which have been shown to produce the largest effects in a number of illusions of area and length. This suggests that Vicario's illusion is similar to other illusions of extent, and that it can be explained by a neural extent-coding model.  相似文献   
40.
We report an eye movement experiment investigating the influence of the focus operator only on syntactic processing of "long" relative clause sentences. Paterson, Liversedge, and Underwood (1999) found that readers were garden pathed by "short" reduced relative clause sentences containing the focus operator only . They argued that due to thematic differences between "short" and "long" relative clause sentences, garden path effect might not occur when "long" reduced relative clause sentences are read. Eye-tracking data show that garden path effects found during initial processing of the disambiguating verb of "long" reduced sentences without only were absent or delayed in the case of counterparts with only . We discuss our results in terms of current theories of sentence processing.  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