全文获取类型
收费全文 | 1553篇 |
免费 | 105篇 |
出版年
2023年 | 15篇 |
2021年 | 31篇 |
2020年 | 27篇 |
2019年 | 32篇 |
2018年 | 56篇 |
2017年 | 51篇 |
2016年 | 66篇 |
2015年 | 47篇 |
2014年 | 40篇 |
2013年 | 183篇 |
2012年 | 64篇 |
2011年 | 71篇 |
2010年 | 49篇 |
2009年 | 41篇 |
2008年 | 62篇 |
2007年 | 64篇 |
2006年 | 61篇 |
2005年 | 55篇 |
2004年 | 36篇 |
2003年 | 50篇 |
2002年 | 38篇 |
2001年 | 21篇 |
2000年 | 29篇 |
1999年 | 17篇 |
1998年 | 14篇 |
1997年 | 11篇 |
1996年 | 13篇 |
1995年 | 13篇 |
1994年 | 17篇 |
1992年 | 13篇 |
1991年 | 13篇 |
1990年 | 19篇 |
1989年 | 18篇 |
1988年 | 19篇 |
1987年 | 19篇 |
1986年 | 11篇 |
1985年 | 29篇 |
1984年 | 13篇 |
1983年 | 17篇 |
1982年 | 13篇 |
1981年 | 12篇 |
1979年 | 16篇 |
1978年 | 16篇 |
1977年 | 11篇 |
1976年 | 12篇 |
1975年 | 10篇 |
1974年 | 17篇 |
1973年 | 12篇 |
1968年 | 11篇 |
1967年 | 10篇 |
排序方式: 共有1658条查询结果,搜索用时 15 毫秒
21.
Few studies have evaluated best friendship dissolutions and especially the circumstances surrounding the dissolutions. In this exploratory study of young adolescents (N = 273, Mage = 11.83 years; 51% boys), we investigate young adolescents' experiences with two types of best friendship dissolution (complete dissolutions, downgrade dissolutions) and two characteristics of such experiences: initiation status (self- versus friend-initiation) and emotional reactions (degree of happiness, anger, sadness, and embarrassment). We also consider whether these characteristics of best friendship dissolutions are related to psychological difficulties (loneliness, depressive symptoms). Results indicated that most young adolescents perceive their friends initiated their recent complete and downgrade dissolutions. When young adolescents did initiate their complete dissolutions, however, they reported less negative (anger) and more positive (happiness) emotional responses. Initiation status was not related to psychological difficulties, but variability in several types of emotional responses (e.g., embarrassment) was related to variability in loneliness and depressive symptoms. Findings underscore the importance of considering not only the type of dissolution, but also the circumstances surrounding dissolutions, during early adolescence. 相似文献
22.
Most studies of ambiguity aversion rely on experimental paradigms involving monetary bets. Thus, the extent to which ambiguity aversion occurs outside of such contexts is much less understood, particularly when the situation cannot easily be reduced to numerical terms. The present work seeks to understand whether people prefer to avoid ambiguous decisions in a variety of different qualitative domains (e.g., work, family, love, friendship, exercise, study, and health), and, if so, to determine the role played by prior beliefs in those domains. Across three studies, we presented participants with 24 vignettes and measured the degree to which they preferred risk to ambiguity in each. We also asked them for their prior probability estimates about the likely outcomes in the ambiguous events. Ambiguity aversion was observed in the vast majority of vignettes, but at different magnitudes. It was predicted by whether the vignette involved gain or loss as well as by people's prior beliefs; however, the heterogeneity between people meant that the role of prior beliefs was only evident in an individual-level analysis (i.e., not at the group level). Our results suggest that the desire to avoid ambiguity occurs in a wide variety of qualitative contexts but to different degrees for different people and may be partially driven by unfavorable prior estimates of the likely outcomes of the ambiguous events. 相似文献
23.
Five experiments examined the role of resource evaluability on giving. We systematically varied participants' resources they and another potential donor received and whether they could donate to a recipient either by themselves or with the other donor. Participants in the relative advantage condition received more resources than the other donor, and those in the relative disadvantage condition received fewer resources than the other donor. The presence of the other donor made participants' resources evaluable and shaped giving: Relatively disadvantaged participants were proportionally more generous than advantaged participants but only when they could evaluate their resources. Neither the mere presence of others nor reputational concerns could explain the results. Exploratory mediation and moderation analyses further showed that relatively disadvantaged participants give proportionally more the higher and the more equal they perceive their status to the advantaged donor. This shows that the generosity of those who have less does depend on how they evaluate their status compared to other donors. Our results provide insights into the question of why and when resource asymmetries between donors result in prosocial giving and can influence fundraising strategies of charitable organizations. 相似文献
24.
25.
Murray J. White 《Attention, perception & psychophysics》1970,8(2):107-109
The effect of retinal locus on the letter-span error function was investigated by requiring Ss to fixate at the left, middle, or right of lines of letters presented for 100 msec. Stimulus presentations consisted of lines of eight letters presented across the visual field, and lines of four letters presented alternately in the left and right visual hemifields. Locus of fixation and relative letter position were found to be significantly related to whether or not a letter was correctly localized. A significant interaction between locus of fixation and letter position was observed. 相似文献
26.
27.
28.
Averaged responses of the occipital lobes to flashes imposed along the midline of the upper part of the retina are larger and of shorter latency than responses to flashes imposed on the lower retina. Since reaction times also are shorter when the upper retina is stimulated, this study provides further evidence for the generalization that reaction time varies inversely with amplitude and directly with latency of the evoked response. 相似文献
29.
30.