全文获取类型
收费全文 | 6395篇 |
免费 | 386篇 |
国内免费 | 2篇 |
出版年
2021年 | 57篇 |
2020年 | 112篇 |
2019年 | 131篇 |
2018年 | 171篇 |
2017年 | 217篇 |
2016年 | 216篇 |
2015年 | 157篇 |
2014年 | 187篇 |
2013年 | 741篇 |
2012年 | 302篇 |
2011年 | 327篇 |
2010年 | 200篇 |
2009年 | 212篇 |
2008年 | 262篇 |
2007年 | 281篇 |
2006年 | 235篇 |
2005年 | 234篇 |
2004年 | 227篇 |
2003年 | 201篇 |
2002年 | 213篇 |
2001年 | 103篇 |
2000年 | 112篇 |
1999年 | 106篇 |
1998年 | 92篇 |
1997年 | 85篇 |
1996年 | 94篇 |
1995年 | 87篇 |
1994年 | 77篇 |
1993年 | 62篇 |
1992年 | 81篇 |
1991年 | 61篇 |
1990年 | 52篇 |
1989年 | 50篇 |
1988年 | 48篇 |
1987年 | 42篇 |
1986年 | 46篇 |
1985年 | 62篇 |
1984年 | 59篇 |
1983年 | 50篇 |
1982年 | 72篇 |
1981年 | 71篇 |
1980年 | 52篇 |
1979年 | 52篇 |
1978年 | 43篇 |
1977年 | 66篇 |
1976年 | 40篇 |
1975年 | 46篇 |
1974年 | 38篇 |
1973年 | 45篇 |
1972年 | 35篇 |
排序方式: 共有6783条查询结果,搜索用时 187 毫秒
31.
A MOTIVATIONAL ANALYSIS OF EMOTION: Reflex-Cortex Connections 总被引:1,自引:0,他引:1
32.
33.
A number of investigators have suggested that affective states influence the focus of attention. One recent proposal is that negative moods increase self-focus. This review considers the evidence that bears on this hypothesis. Conceptual issues pertaining to the construct of self-focus are discussed first. Next, the various parameters that influence attentional focus are presented in order to provide a way of organizing the mood/selffocus literature. Studies that have used state measures of mood and self-focus are considered in this context. Methodological limitations of existing studies are discussed and directions for future work provided. 相似文献
34.
Feature integration theory has recently been revised with two proposals that visual conjunction search can be parallel under some circumstances—either because items with nontarget features are inhibited, or because items with target features are excited. We examined whether excitatory or inhibitory guidance controlled conjunction search for an X oscillating in one direction among Os oscillating in that direction and Xs oscillating in another. Search was affected by whether items oscillated in phase with each other, and it was exceptionally difficult when items with target motion moved out of phase with each otherand items with nontarget motion moved out of phase. The results suggest that conjunction search can be guided both by excitation of target features and by inhibition of nontarget features. 相似文献
35.
K Peter A Glaser G E Kühne 《Psychiatrie, Neurologie, und medizinische Psychologie》1989,41(8):485-491
Based on earlier experiences of various groups of authors, we developed and modified a programme of cognitive therapy for schizophrenic patients. The aim of the application of the therapeutic programme to subacute patients was to decrease subjectively perceptible basic disorders and to improve the functions of performance. The present results and experiences with 4 groups consisting of a total of 31 patients encourage us to continue applying cognitive procedures of therapy. Problems of the ascertainment of measuring values and fundamental questions of therapeutic efficacy are discussed. 相似文献
36.
Peter Turney 《Synthese》1989,79(3):515-542
The logic of scientific discovery is now a concern of computer scientists, as well as philosophers. In the computational approach to inductive inference, theories are treated as algorithms (computer programs), and the goal is to find the simplest algorithm that can generate the given data. Both computer scientists and philosophers want a measure of simplicity, such that simple theories are more likely to be true than complex theories. I attempt to provide such a measure here. I define a measure of simplicity for directed graphs, inspired by Herbert Simon's work. Many structures, including algorithms, can be naturally modelled by directed graphs. Furthermore, I adapt an argument of Simon's to show that simple directed graphs are more stable and more resistant to damage than complex directed graphs. Thus we have a reason for pursuing simplicity, other than purely economical reasons.This paper is based on part of my doctoral dissertation. Thanks to my thesis supervisor Professor Alasdair Urquhart for his encouragement, constructive criticism, and for directing me to several relevant articles; to my advisor, Professor Ian Hacking, for reminding me to concentrate on results that might have some application in the real world; to Professor Eric Mendelsohn for checking my use of graph theory; and to my friend Wendy Brandts for sharing her ideas on a closely related problem.Thanks to my friends and family (the latter being a (proper) subset of the former, and both including Dr. Louise Linney, of course) for ongoing support in my scholastic endeavors.Thanks to the Social Sciences and Humanities Research Council for financial assistance. (Awards 452-86-5885 and 453-87-0513.) Thanks to the University of Toronto for financial assistance. 相似文献
37.
Peter E. Politser 《决策行为杂志》1989,2(3):149-165
In this paper, 1 describe psychological guidelines for simplifying medical information — methods to aid the perception and recognition of abnormalities in medical test reports. These techniques resemble natural human editing strategies outlined in prospect theory. The methods pre-edit data as humans do but to reduce human effort. I review empirical studies assessing these techniques and discuss needs for further research. 相似文献
38.
This article presents a critique of the concept of randomness as it occurs in the psychological literature. The first section of our article outlines the significance of a concept of randomness to the process of induction; we need to distinguish random and non-random events in order to perceive lawful regularities and formulate theories concerning events in the world. Next we evaluate the psychological research that has suggested that human concepts of randomness are not normative. We argue that, because the tasks set to experimental subjects are logically problematic, observed biases may be an artifact of the experimental situation and that even if such biases do generalise they may not have pejorative implications for induction in the real world. Thirdly we investigate the statistical methodology utilised in tests for randomness and find it riddled with paradox. In a fourth section we find various branches of scientific endeavour that are stymied by the problems posed by randomness. Finally we briefly mention the social significance of randomness and conclude by arguing that such a fundamental concept merits and requires more serious considerations. 相似文献
39.
40.
How is attention distributed over visual space when an observer expects a target to occur at one of several possible locations? Two experiments sought to understand the source of the conflict between studies leading to the notions of hemifield activation (Hughes and Zimba 1985) and attentional gradients (Downing and Pinker 1985; Shulman et al. 1985, 1986). Subjects were cued to attend one of the 4 corners of an imaginary square centered at fixation, allowing comparison of uncued locations in the cued and uncued hemifields. In one experiment marking of the 4 locations was varied to determine if providing a ‘target’ for attention is necessary to obtain within-hemifield gradients. RT was faster at the cued location than at the three uncued locations which had equivalent latencies, a pattern that was unaffected by marking of the potential target locations. This result, which is consistent with the notion of a gradient around the attended location is a strong disconfirmation of the hemifield activation hypothesis. The second experiment demonstrated that an unusual procedure for presenting the probe stimuli in Hughes and Zimba (1985) is at least partially responsible for their evidence for uniform hemifield activation. It is proposed that visual attention is directed to visuo-spatial channels with fixed structural properties, and that when attention to two locations is desired, the subject may attend a spatial channel located between them. 相似文献