全文获取类型
收费全文 | 4217篇 |
免费 | 174篇 |
出版年
2022年 | 22篇 |
2021年 | 26篇 |
2020年 | 66篇 |
2019年 | 54篇 |
2018年 | 93篇 |
2017年 | 106篇 |
2016年 | 158篇 |
2015年 | 69篇 |
2014年 | 117篇 |
2013年 | 552篇 |
2012年 | 162篇 |
2011年 | 184篇 |
2010年 | 100篇 |
2009年 | 141篇 |
2008年 | 178篇 |
2007年 | 176篇 |
2006年 | 191篇 |
2005年 | 118篇 |
2004年 | 159篇 |
2003年 | 138篇 |
2002年 | 136篇 |
2001年 | 68篇 |
2000年 | 64篇 |
1999年 | 59篇 |
1998年 | 69篇 |
1997年 | 63篇 |
1996年 | 56篇 |
1995年 | 51篇 |
1994年 | 71篇 |
1993年 | 51篇 |
1992年 | 42篇 |
1991年 | 37篇 |
1990年 | 32篇 |
1989年 | 37篇 |
1988年 | 40篇 |
1987年 | 44篇 |
1986年 | 32篇 |
1985年 | 46篇 |
1984年 | 42篇 |
1983年 | 35篇 |
1982年 | 56篇 |
1981年 | 42篇 |
1980年 | 37篇 |
1979年 | 34篇 |
1978年 | 45篇 |
1977年 | 48篇 |
1976年 | 49篇 |
1975年 | 41篇 |
1974年 | 33篇 |
1973年 | 27篇 |
排序方式: 共有4391条查询结果,搜索用时 78 毫秒
951.
952.
953.
954.
955.
956.
957.
Two experiments were conducted to test a prediction of the Kosslyn & Shwartz computer simulation model of mental image processing. According to this model, more complex images require more time to form because parts are placed sequentially, and larger images require more time to form than smaller ones because more parts are placed. If these accounts are correct, then the advantage of forming a small image (i.e., one that seems to subtend a smaller visual angle) should be greater for more complex objects because the difference in number of parts imaged at the two sizes will be greater than with simpler objects. This prediction was confirmed only when subjects were not motivated to form highly elaborated images at small sizes. When subject tried to include all details, it actually took longest to form images of complex objects at small sizes. Both of these results support the central assumption of the Kosslyn-Shwartz model, namely the existence of a fixed resolution analog spatial medium. 相似文献
958.
959.
Choosing between conflicting goals is a frequent yet difficult problem, especially when temptations are involved because self-control effort is required to overcome them. This study investigated whether experiencing mixed emotions in response to goal conflict can facilitate the necessary self-control effort needed to resist temptations. A sample of 73 individuals participated in an intensive longitudinal study, completing several measures 4 times a day during ten consecutive days, producing over 2500 observations. Results derived from using multilevel structural equation modeling confirmed that mixed emotions mediated the relationship between perceived goal conflict and intentions to resist temptations, over and above the influence of single positive emotions or negative emotions, and trait levels of self-control. Implication of these findings for collaboration and the impact of mixed emotions in more general social dilemmas are explored. 相似文献
960.
Stuart F. White Laura C. Thornton Joseph Leshin Roberta Clanton Stephen Sinclair Dionne Coker-Appiah Harma Meffert Soonjo Hwang James R. Blair 《Journal of abnormal child psychology》2018,46(4):741-754
Theoretical models have implicated amygdala dysfunction in the development of Disruptive Behavior Disorders (DBDs; Conduct Disorder/Oppositional Defiant Disorder). Amygdala dysfunction impacts valence evaluation/response selection and emotion attention in youth with DBDs, particularly in those with elevated callous-unemotional (CU) traits. However, amygdala responsiveness during social cognition and the responsiveness of the acute threat circuitry (amygdala/periaqueductal gray) in youth with DBDs have been less well-examined, particularly with reference to CU traits. 31 youth with DBDs and 27 typically developing youth (IQ, age and gender-matched) completed a threat paradigm during fMRI where animate and inanimate, threatening and neutral stimuli appeared to loom towards or recede from participants. Reduced responsiveness to threat variables, including visual threats and encroaching stimuli, was observed within acute threat circuitry and temporal, lateral frontal and parietal cortices in youth with DBDs. This reduced responsiveness, at least with respect to the looming variable, was modulated by CU traits. Reduced responsiveness to animacy information was also observed within temporal, lateral frontal and parietal cortices, but not within amygdala. Reduced responsiveness to animacy information as a function of CU traits was observed in PCC, though not within the amygdala. Reduced threat responsiveness may contribute to risk taking and impulsivity in youth with DBDs, particularly those with high levels of CU traits. Future work will need to examine the degree to which this reduced response to animacy is independent of amygdala dysfunction in youth with DBDs and what role PCC might play in the dysfunctional social cognition observed in youth with high levels of CU traits. 相似文献