全文获取类型
收费全文 | 12731篇 |
免费 | 528篇 |
国内免费 | 2篇 |
专业分类
13261篇 |
出版年
2021年 | 73篇 |
2020年 | 136篇 |
2019年 | 167篇 |
2018年 | 236篇 |
2017年 | 262篇 |
2016年 | 263篇 |
2015年 | 203篇 |
2014年 | 264篇 |
2013年 | 1436篇 |
2012年 | 454篇 |
2011年 | 495篇 |
2010年 | 306篇 |
2009年 | 321篇 |
2008年 | 486篇 |
2007年 | 441篇 |
2006年 | 430篇 |
2005年 | 439篇 |
2004年 | 437篇 |
2003年 | 420篇 |
2002年 | 451篇 |
2001年 | 224篇 |
2000年 | 183篇 |
1999年 | 199篇 |
1998年 | 213篇 |
1997年 | 204篇 |
1996年 | 163篇 |
1995年 | 174篇 |
1994年 | 159篇 |
1993年 | 180篇 |
1992年 | 168篇 |
1991年 | 140篇 |
1990年 | 143篇 |
1989年 | 126篇 |
1988年 | 119篇 |
1987年 | 131篇 |
1986年 | 117篇 |
1985年 | 148篇 |
1984年 | 187篇 |
1983年 | 190篇 |
1982年 | 192篇 |
1981年 | 173篇 |
1980年 | 140篇 |
1979年 | 132篇 |
1978年 | 177篇 |
1977年 | 156篇 |
1976年 | 160篇 |
1975年 | 142篇 |
1974年 | 157篇 |
1973年 | 106篇 |
1972年 | 78篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
Kenneth D. Hopkins Robert A. Smith Warren G. Findley John N. McCall 《Psychometrika》1967,32(3):355-360
142.
Certain investigators have found that recognition is impaired when a recall test is interpolated during the retention interval. One possible explanation of this finding is that interpolated recall leads subjects to employ a more stringent recognition criterion. In the two experiments reported here, the influence of the recognition criterion was eliminated by using a multiple-response test requiring subjects to rank a recognition list consisting of old and new items. Nevertheless recall impaired subsequent recognition in both experiments, the effect being most marked for lowly ranked items. The recognition test in the first experiment was carried out in two stages. This made possible a direct examination of whether recall has an effect on the recognition criterion. No evidence for such an effect was obtained. Other ways in which recall may affect the recognition criterion are discussed. 相似文献
143.
Harold W. Hake Gerald W. Faust John S. McIntyre Harry G. Murray 《Attention, perception & psychophysics》1967,2(10):469-478
Judgments were made of the size of a small, luminous (inner) square appearing in the center of a somewhat larger, variable (outer) square, the whole pattern appearing in the dark. Accuracy of judgment was greatest when the outer square was constant from trial to trial but deteriorated when the outer square also varied in size, reaching a lower limit less than the accuracy produced under the absolute judgment condition (no outer square presented). An application of multiple discriminant analysis and the use of a maximum likelihood observer model provided estimates of the extent to which Os responded to inner and outer size variation as separate aspects of stimulation. Although Os differed markedly in this respect, their ability to identify inner square size under the various conditions did not reflect this difference. 相似文献
144.
145.
146.
John E. Overall 《Psychometrika》1960,25(2):159-172
A quantitative model for the behavior of albino rats in choice-making situations is presented. The model, which is based upon a cognitive conceptualization of the learning process, is shown to yield predictions which are equivalent to those produced by the linear operator stochastic models at the asymptotic limit but which differ from these during early trials in the learning situation. 相似文献
147.
Varying temporal placement of an added stimulus in a fixed-interval schedule 总被引:4,自引:4,他引:0 下载免费PDF全文
One paradigm for exploring stimulus effects on behavior is defined for steady state experiments. The paradigm is illustrated by a 60-sec fixed-interval reinforcement schedule wherein a 6-sec light is introduced into each interval. The temporal relation of this stimulus to the reinforcer is the independent variable that is systematically explored. Two experiments studied this temporal relation under two parametric conditions: (a) when the 6-sec light occurs once in each 60-sec interval, (b) when the 6-sec light occurs twice in each interval, the second time always during the 6 sec immediately preceding the reinforcer. Functions are presented showing the effect of the 6-sec light on responding at all points in the fixed-interval. 相似文献
148.
149.
A FREE OPERANT PROCEDURE WAS USED TO DETERMINE WHETHER OR NOT ONE RAT COULD DISCRIMINATE: (1) between the presence and absence of a second rat, and (2) between two other rats of the same species and sex. The subjects were four male Wistar rats. The discriminatory response was a bar press and food was used as reinforcement during training. Although there were wide individual differences in rate of learning, all subjects learned to make both discriminations. 相似文献
150.
This study was designed to determine the relationships between changes in academic performance and intellective and non-intellective factors. Seventh grade students attending five junior high schools, who had attended selected elementary schools, were tested with the Personal Values Inventory (PVI), a test of academic motivation, shortly after the first seventh-grade marking period. School marks at that marking period and those received the previous year were procured from a self-report included in the PVI. All students had taken the California Achievement Test Battery and Mental Maturity Test as well as the Scholastic Testing Service Work-Study Skills Test in the sixth grade. Factor analysis identified four factors in both boys and girls: intelligence-achievement, academic motivation, academic plans, and youth-culture involvement. While intelligence was found to be mainly unrelated to the criterion, the non-intellective factors, especially academic motivation, bore significant relationships to the changed performance. 相似文献