全文获取类型
收费全文 | 51980篇 |
免费 | 2080篇 |
国内免费 | 30篇 |
出版年
2020年 | 582篇 |
2019年 | 733篇 |
2018年 | 1056篇 |
2017年 | 1052篇 |
2016年 | 1107篇 |
2015年 | 738篇 |
2014年 | 908篇 |
2013年 | 4509篇 |
2012年 | 1644篇 |
2011年 | 1793篇 |
2010年 | 1042篇 |
2009年 | 1060篇 |
2008年 | 1627篇 |
2007年 | 1603篇 |
2006年 | 1411篇 |
2005年 | 1282篇 |
2004年 | 1256篇 |
2003年 | 1138篇 |
2002年 | 1180篇 |
2001年 | 1747篇 |
2000年 | 1648篇 |
1999年 | 1264篇 |
1998年 | 662篇 |
1997年 | 569篇 |
1996年 | 512篇 |
1995年 | 516篇 |
1994年 | 494篇 |
1993年 | 515篇 |
1992年 | 1008篇 |
1991年 | 953篇 |
1990年 | 939篇 |
1989年 | 849篇 |
1988年 | 812篇 |
1987年 | 800篇 |
1986年 | 803篇 |
1985年 | 853篇 |
1984年 | 667篇 |
1983年 | 576篇 |
1982年 | 469篇 |
1979年 | 653篇 |
1978年 | 485篇 |
1976年 | 446篇 |
1975年 | 589篇 |
1974年 | 619篇 |
1973年 | 594篇 |
1972年 | 539篇 |
1971年 | 473篇 |
1968年 | 539篇 |
1967年 | 540篇 |
1966年 | 475篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
791.
792.
793.
Configurational information in face perception 总被引:10,自引:0,他引:10
A new facial composites technique is demonstrated, in which photographs of the top and bottom halves of different familiar faces fuse to form unfamiliar faces when aligned with each other. The perception of a novel configuration in such composite stimuli is sufficiently convincing to interfere with identification of the constituent parts (experiment 1), but this effect disappears when stimuli are inverted (experiment 2). Difficulty in identifying the parts of upright composites is found even for stimuli made from parts of unfamiliar faces that have only ever been encountered as face fragments (experiment 3). An equivalent effect is found for composites made from internal and external facial features of well-known people (experiment 4). These findings demonstrate the importance of configurational information in face perception, and that configurations are only properly perceived in upright faces. 相似文献
794.
G. V. Caprara T. Gargaro C. Pastorelli M. Prezza P. Renzi A. Zelli 《Personality and individual differences》1987,8(6)
After inducing hostility toward a confederate by threatening subjects' self-esteem, subjects were then given the opportunity either to deliver shocks (Experiment 1) or to withhold rewards (Experiment 2) from their confederate. Physiological measures were taken prior to the hostility induction, shortly after the induction and, finally, after the opportunity to aggress. Measures of individual differences relating to aggressive behavior were also considered. While the experimental manipulation was the best predictor in the ‘withholding rewards’ condition, measures of dissipation-rumination tendencies and emotional vulnerability were the best predictors in the ‘shock administration’ condition. In both conditions, systolic blood pressure seemed to reflect differences in arousal as a function of the hostility induction procedure, while subjects in the withhold rewards procedure also showed a decrease in systolic pressure after having an opportunity to aggress toward the confederate. It was concluded that not only is the withholding of rewards a more ethically acceptable procedure than shock administration, but it is also more likely to reflect experimental rather than individual difference affects. 相似文献
795.
Brain potentials as indices of orthographic and phonological interaction during word matching 总被引:4,自引:0,他引:4
A F Kramer E Donchin 《Journal of experimental psychology. Learning, memory, and cognition》1987,13(1):76-86
The interaction between orthographic and phonological codes in a same-different judgment task was studied by requiring subjects to decide if two visually presented words either looked alike or rhymed. Word pairs were selected from four different lists. Words rhymed and looked alike, rhymed but did not look alike, looked alike but did not rhyme, or neither looked alike nor rhymed. Reaction time and percent error increased whenever there was a conflict between the orthography and phonology of the words. The N200 component of the event-related brain potential (ERP) indicated that subjects were capable of detecting phonological differences between words within 260 ms from the presentation of a word pair. The amplitude of the N200s also varied with the degree of mismatch between words. N200s were largest when both the orthography and phonology mismatched, of intermediate amplitude when either orthography or phonology mismatched, and smallest when both orthography and phonology matched. P300 latency was consistent with reaction time, increasing whenever there was a conflict between the two codes. Taken together, behavioral measures and the ERP data suggest that the extraction of the orthographic and phonological aspects of words occurs early in the information processing sequence. 相似文献
796.
J C Bartlett M A Gernsbacher R E Till 《Journal of experimental psychology. Learning, memory, and cognition》1987,13(1):27-35
In a study of recognition memory for pictures, we observed an asymmetry in classifying test items as "same" versus "different" in left-right orientation: Identical copies of previously viewed items were classified more accurately than left-right reversals of those items. Response bias could not explain this asymmetry, and, moreover, correct "same" and "different" classifications were independently manipulable: Whereas repetition of input pictures (one vs. two presentations) affected primarily correct "same" classifications, retention interval (3 hr vs. 1 week) affected primarily correct "different" classifications. In addition, repetition but not retention interval affected judgments that previously seen pictures (both identical and reversed) were "old". These and additional findings supported a dual-process hypothesis that links "same" classifications to high familiarity, and "different" classifications to conscious sampling of images of previously viewed pictures. 相似文献
797.
This study examined the effects of two social cues on women's and men's self-confidence: the sex and performance of another in an achievement setting. Before trying to solve 60 anagrams, women expected to perform more poorly than men. In addition, both sexes expected to perform more poorly when paired with a male confederate than when paired with a female confederate. The effect of the partner's sex showed up in anagram performance: people with a female partner solved more anagrams than people with a male partner. The effect of subject's sex on performance was unexpected: women solved more anagrams than men. After the task, sex differences in self-confidence disappeared; neither sex of subject nor sex of partner influenced self-confidence. The partner's performance, however, had a strong effect on everyone: people were less self-confident if they had worked with a high-scoring partner. The pattern of results suggests that sex-of-subject differences in self-confidence, while important, are less powerful than the effects wielded by the sex of others in achievement settings. 相似文献
798.
David E. Sandberg Anke A. Ehrhardt Claude A. Mellins Susan E. Ince Heino F. L. Meyer-Bahlburg 《Sex roles》1987,16(11-12):649-668
The term pioneer is used for girls aspiring to male-dominated careers. This longitudinal study assesses the career choices of 68 middle-class girls during childhood (8–13 years, Phase I) and again during adolescence (13–18 years, Phase II), and investigates the relation between pioneering career choice and personal and family characteristics. Subjects were originally selected for exposure vs nonexposure to exogenous hormones during pregnancy. In childhood, pioneers were somewhat older, were more often persistent tomboys, had higher IQs, and had parents with higher educational attainment. In adolescence, paternal education was the only variable that showed the same relation to career choice. Adolescent girls who had wanted to get married at the time of the childhood assessment were now less likely to choose pioneering careers. Adolescent pioneers also had higher educational aspirations than nonpioneers and less likely anticipated being married within ten years than nonpioneers. A number of statistically borderline relationships were also observed: pioneers had somewhat fewer older brothers than nonpioneers, less often came from homes in which traditional femininity was stressed, and more frequently had mothers who had worked outside the home throughout their daughters' school years than mothers of nonpioneers. Prenatal exposure to exogenous sex hormones was not related to career choice during either childhood or adolescence. 相似文献
799.
目的、意向和意识 总被引:1,自引:0,他引:1
本文提出了一个意向性目标搜寻的计算机模型,它有两个部分,静态部分包括一个目标表征和到达这个目标的程序。动态部分是一个感觉输入、中间信息加工,行为输出的重复的反馈循环。人类意向必然伴有意识,但机器人则可能无意识而有意向。 利用目标搜寻系统机器人模型,我们对目标搜寻系统的目的连续统下了定义;这个连续统从简单的直接反应系统一直到意向性系统。对这个目的连续统有两种传统的解释:一是柏拉图、亚里士多德和普罗提诺的终极原因理论,二是希腊原子论者和现代进化生物学家的还原主义学说。本文评价了这些学说。 本文考察了几种类型的意识机能,提出了以自动机为依据的意识理论,比较了人类和计算机。从计算机结构的角度来看,人类意识是一类特殊的计算机控制系统。 相似文献
800.
Kenneth A. Wallston Barbara Strudler Wallston Shelton Smith Carolyn J. Dobbins 《Current Psychology》1987,6(1):5-25
Perceived control (PC) is defined as thebelief that one can determine one’s own internal states and behavior, influence one’s environment, and/or bring about desired outcomes.
Two important dimensions of PC are delineated: (1) whether the object of control is located in the past or the future and
(2) whether the object of control is over outcome, behavior, or process. A variety of constructs and measures of PC (e.g.,
efficacy, attribution, and locus of control) are discussed in relation to these dimensions and selected studies are reviewed.
The issues, controversies, and limits of the research on perceived control and health are addressed in terms of the antecedents
and consequences of perceived control. Investigations should clearly conceptualize the object of perceived control, use measures
that match the conceptualization, and when attempting to manipulate control, directly measure perceived control. The relation
between PC and health outcomes is complex, and different aspects of PC may interact to affect health outcomes. 相似文献