全文获取类型
收费全文 | 55599篇 |
免费 | 1952篇 |
国内免费 | 19篇 |
出版年
2018年 | 829篇 |
2017年 | 823篇 |
2016年 | 900篇 |
2015年 | 624篇 |
2014年 | 774篇 |
2013年 | 4882篇 |
2012年 | 1409篇 |
2011年 | 1496篇 |
2010年 | 947篇 |
2009年 | 898篇 |
2008年 | 1345篇 |
2007年 | 1254篇 |
2006年 | 1160篇 |
2005年 | 1001篇 |
2004年 | 983篇 |
2003年 | 980篇 |
2002年 | 991篇 |
2001年 | 1760篇 |
2000年 | 1704篇 |
1999年 | 1308篇 |
1998年 | 603篇 |
1996年 | 652篇 |
1995年 | 612篇 |
1994年 | 617篇 |
1993年 | 604篇 |
1992年 | 1267篇 |
1991年 | 1140篇 |
1990年 | 1162篇 |
1989年 | 1057篇 |
1988年 | 1041篇 |
1987年 | 1025篇 |
1986年 | 1030篇 |
1985年 | 1034篇 |
1984年 | 873篇 |
1983年 | 746篇 |
1982年 | 590篇 |
1981年 | 595篇 |
1979年 | 892篇 |
1978年 | 673篇 |
1976年 | 576篇 |
1975年 | 827篇 |
1974年 | 833篇 |
1973年 | 881篇 |
1972年 | 815篇 |
1971年 | 730篇 |
1970年 | 658篇 |
1969年 | 704篇 |
1968年 | 833篇 |
1967年 | 721篇 |
1966年 | 718篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
G. C. Preston 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1985,37(1):23-31
Rats' lever presses on a retractable lever earned brief presentations of discriminative stimuli signalling periods in which responding on an alternative lever was either non-reinforced (extinction) or reinforced on a random ratio schedule. The predictions of two theoretical accounts of this behaviour were tested by studying the effects of omitting either the stimulus signalling the reinforced or that signalling the non-reinforced schedule component. Under these conditions rats' behaviour is determined by the conditioned, affective properties of the stimuli rather than by their purely informational properties. 相似文献
52.
53.
The ability to make egocentric distance estimates of a single point source of light, seen in darkness and without the cues of changing size and luminance, was investigated in sixteen observers. The attenuation required to maintain constant luminance, when the target was viewed from different distances, was shown to follow the inverse square law providing the angle subtended by the light was less than 20 s arc. Distance changes were also simulated by means of a split mirror which produced vergence cues, or by test lenses to provide accommodation cues. Over the range 0.5 to 9.2 m distance estimates were surprisingly accurate, although there was some overestimation of near and underestimation of far distances. Most observers made good judgements when only convergence cues were varied, whereas no observers made consistently good judgements when only accommodation cues were varied. The difficulties are discussed in terms of the accommodation-convergence link. When distance was simulated by changing convergence and accommodation cues, estimates were not as good as when real distance was changed. Since good estimates were made with brief target exposures, these judgements were not based on subsequent convergence or accommodation changes. It is suggested that the metric or reference against which the apparently absolute judgements were made was the efferent demand signal associated with a 'resting' position of convergence in darkness. 相似文献
54.
55.
56.
57.
58.
59.
Martinus J. A. Buekers Richard A. Magill Kellie G. Hall 《The Quarterly Journal of Experimental Psychology Section A: Human Experimental Psychology》1992,44(1):105-117
Even though it can be shown that verbal knowledge of results (KR) is redundant with sensory feedback for learning certain motor skills, such findings do not eliminate the possibility that when KR is available it influences underlying learning processes. In order to examine the function of KR more closely, two experiments were designed in which the subjects received conflicting information about their own sensory feedback and the KR presented by the experimenter. In Experiment 1, two erroneous-KR groups, a correct-KR group, and a no-KR group performed 150 practice trials on a simple anticipation timing task and then performed three no-KR retention tests of 30 trials each following intervals of 10 minutes, 1 week, and 1 month. The results supported previous findings that providing correct KR is redundant in anticipation tasks. However, learning was influenced by KR as subjects performed according to the erroneous KR information, thereby ignoring their sensory feedback even after a 1-month interval. In Experiment 2, subjects practised a more complex striking response for the anticipation task for 75 trials and then performed no-KR retention trials either immediately, or 1 day or 1 week later. One of the groups received erroneous KR after 50 practice trials with correct KR. The results confirmed and extended those from Experiment 1, as erroneous KR, even after initial practice with correct KR, influenced retention performance. These results indicate that although KR provides information that is not needed to learn anticipation timing skills, this augmented verbal information is a dominant source of information that influences underlying cognitive processes involved in learning motor skills. 相似文献
60.