全文获取类型
收费全文 | 152篇 |
免费 | 7篇 |
专业分类
159篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2021年 | 4篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 14篇 |
2017年 | 9篇 |
2016年 | 15篇 |
2015年 | 1篇 |
2014年 | 8篇 |
2013年 | 15篇 |
2012年 | 8篇 |
2011年 | 3篇 |
2010年 | 6篇 |
2009年 | 1篇 |
2008年 | 9篇 |
2007年 | 8篇 |
2006年 | 3篇 |
2005年 | 6篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 7篇 |
2001年 | 7篇 |
2000年 | 1篇 |
1999年 | 5篇 |
1998年 | 6篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1989年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有159条查询结果,搜索用时 15 毫秒
101.
102.
The central questions addressed in this paper are whether present generations of adolescents and adults worldwide are at greater risk of developing suicidal reactions than previous generations were and what the possible causal mechanisms involved are. On the basis of data from international and national data banks as well as an extensive review of the literature, it is concluded that a true increase in suicide mortality and morbidity has occurred over the larger part of this century among the White urban adolescent and young adult populations of North America and Europe, particularly among (young) males over the last three decades. Among the possible causal mechanisms identified are (1) the corresponding increase in the prevalence of depressive disorders; (2) the corresponding increase in the prevalence of substance (ab)use and substance abuse disorders, and a lowering of age of onset of (ab)use; (3) psychobiological changes, in particular the dramatic lowering of the age of puberty; (4) an increase in the number of social stressors with extensive consequences for youth; (5) changes in attitudes towards suicidal behaviors and the related increased availability of suicidal models. 相似文献
103.
Sebastiano Costa Nadia Barberis Rosalba Larcan Francesca Cuzzocrea 《Psychology, health & medicine》2018,23(7):880-890
Researchers have become increasingly interested in investigating the role of the psychological aspects related to the perception of cervical screening barriers. This study investigates the influence of trait EI on perceived cervical screening barriers. Furthermore, this study investigates the incremental validity of trait EI beyond the Big Five, as well as emotion regulation in the perceived barrier towards the Pap test as revealed in a sample of 206 Italian women that were undergoing cervical screening. Results have shown that trait EI is negatively related to cervical screening barriers. Furthermore, trait EI can be considered as a strong incremental predictor of a woman’s perception of screening over and above the Big Five, emotion regulation, age, sexual intercourse experience and past Pap test. Detailed information on the study findings and future research directions are discussed. 相似文献
104.
Altruistic behavior is known to be conditional on the level of altruism of others. However, people often have no information, or incomplete information, about the altruistic reputation of others, for example when the reputation was obtained in a different social or economic context. As a consequence, they have to estimate the other's altruistic intentions. Using an economic game, we showed that without reputational information people have intrinsic expectations about the altruistic behavior of others, which largely explained their own altruistic behavior. This implies that when no information is available, intrinsic expectations can be as powerful a driver of altruistic behavior as actual knowledge about other people's reputation. Two strategies appeared to co-exist in our study population: participants who expected others to be altruistic and acted even more altruistically themselves, while other participants had low expected altruism scores and acted even less altruistically than they expected others to do. We also found evidence that generosity in economic games translates into benefits for other social contexts: a reputation of financial generosity increased the attractiveness of partners in a social cooperative game. This result implies that in situations with incomplete information, the fitness effects of indirect reciprocity are cumulative across different social contexts. 相似文献
105.
Nadia Lopez Fred H. Previc Joseph Fischer Richard P. Heitz Randall W. Engle 《Journal of applied research in memory and cognition》2012,1(1):27-33
This study examined the effects of 35 h of continuous sleep deprivation on performance in a variety of cognitive tasks as well as simulated flight. Ten United States Air Force pilots completed the Multi-Attribute Task Battery (MATB), Psychomotor Vigilance Task (PVT), and Operation Span Task (OSPAN), as well as simulated flight at 3 h intervals over a 35 h sleep deprivation period. Performance declined on all tests after about 18–20 h of continuous sleep deprivation, although the degree to which performance degraded varied. During the second half of the sleep deprivation period, performance on the simulated flight was predicted by PVT and OSPAN reasonably well but much less so by the MATB. Variance from optimal flight performance was predicted by both PVT and OSPAN but each measure added incremental validity to the prediction. The two measures together accounted for 58% of the variance in flight performance in the second half of the sleep deprivation period. 相似文献
106.
This study aimed to determine the extent to which employees’ career adaptability and employability capacities predicted employee retention factors in the information sector industry. A probability sample of 337 South African recruitment advertising employees participated in the study (females = 65.9%; black Africans = 53.4%, predominantly early career stage (aged > 40 years = 57.9%). The employees responded to surveys on their career adaptability, employability capacities, and job retention considerations. Step-wise hierarchical regression analysis was computed to predict employee retention factors from their career meta-capacities of career adaptability and employability attributes. Results suggest the career meta-capacities to explain 71% of the variance in employee retention factors. Moreover, overall career adaptability (concern, control, curiosity, and cooperation) predict the overall retentions factors of employees. White employees self-reported with higher work retention and career opportunities than employees of other races/ethnicities. Career adaptability and employability capabilities matter for talented employee retention in the information sector industry. 相似文献
107.
In both the United States and France, Jewish-fiction writers of the 1920s often invoked the idea of Jewish racial unity as a non-rational, uncontrollable force separating Jews from mainstream society irrespective of their desire for integration. This genre of fiction reveals an ambivalent attitude towards race-thinking. The notion that there are intractable physical differences between groups threatened the Jews status as fully privileged co-citizens. Yet a racialized self-understanding provided them with a way to articulate the intangible bonds of community, which their official status as a purely religious group normally held them back from expressing openly. The common trope of the failed Jewish-Gentile romance best expresses the dual desire of French and American Jews for acceptance and distinctiveness. A sense of racial identity often leads protagonists to reject a non-Jewish lover or spouse and draw strength from a renewed sense of connection with the Jewish people. More often than not, however, these figures are left with feelings of ambivalence and regret, as they realize that their universalist dream of uniting with someone from a different racial background is not possible in the real world, where their Jewish particularism inevitably dooms such relationships to failure.I would like to thank Hasia Diner, Laura Lee Downs and Bonnie S. Anderson for reading and commenting on previous versions of this article. 相似文献
108.
Long-lasting modifications of saccadic eye movements following adaptation induced in the double-step target paradigm 下载免费PDF全文
The adaptation of saccadic eye movements to environmental changes occurring throughout life is a good model of motor learning and motor memory. Numerous studies have analyzed the behavioral properties and neural substrate of oculomotor learning in short-term saccadic adaptation protocols, but to our knowledge, none have tested the persistence of the oculomotor memory. In the present study, the double-step target protocol was used in five human subjects to adaptively decrease the amplitude of reactive saccades triggered by a horizontally-stepping visual target. We tested the amplitude of visually guided saccades just before and at different times (up to 19 days) after the adaptation session. The results revealed that immediately after the adaptation session, saccade amplitude was significantly reduced by 22% on average. Although progressively recovering over days, this change in saccade gain was still statistically significant on days 1 and 5, with an average retention rate of 36% and 19%, respectively. On day 11, saccade amplitude no longer differed from the pre-adaptation value. Adaptation was more effective and more resistant to recovery for leftward saccades than for rightward ones. Lastly, modifications of saccade gain related to adaptation were accompanied by a decrease of both saccade duration and peak velocity. A control experiment indicated that all these findings were specifically related to the adaptation protocol, and further revealed that no change in the main sequence relationships could be specifically related to adaptation. We conclude that in humans, the modifications of saccade amplitude that quickly develop during a double-step target adaptation protocol can remain in memory for a much longer period of time, reflecting enduring plastic changes in the brain. 相似文献
109.
Folk psychology suggests that when an observer views a scene, a unique item will stand out and draw attention to itself. This
belief stands in contrast to numerous studies in visual search that have found that a unique target item (e.g., a unique color)
is not identified more quickly than a nonunique target. We hypothesized that this finding is the result of task demands of
visual search, and that when the task does not involve visual search, uniqueness will pop out. We tested this hypothesis in
a task in which observers were presented an array of letters and asked to respond aloud, as quickly as possible, with the
identity of any one of the letters. The observers were significantly more likely to respond with a uniquely colored letter
than would be expected by chance. In a task in which observers blurt out the first thing that they see, unique pop-out does
not poop out. 相似文献
110.
Makara GB Harbuz MS Coventry TL Jessop DS Zelena D Lightman SL 《Stress (Amsterdam, Netherlands)》2001,4(1):25-37
Adjuvant-induced arthritis (AA) was induced in control and in hypothalamic lesioned Piebald-Viral-Glaxo (PVG) rats. Following discrete paraventricular nucleus (PVN) lesions plasma corticosterone was increased 14 days after adjuvant injection as in controls, when hind paw inflammation was apparent. PVN lesion did not affect the severity of inflammation.In contrast, following medial basal hypothalamus (MBH) lesions adjuvant did not increase corticosterone levels and the increase in paw volume at day 14 was potentiated. Basal proopiomelanocortin(POMC) mRNA expression in the anterior lobe was unchanged by PVN lesions and decreased by MBH lesions. AA increased POMC mRNA in controls and in both PVN and MBH lesioned rats. After complete MBH lesion, surviving anterior pituitary tissue maintained morning levels of corticosterone.Thus, AA may activate the hypothalamo-pituitary-adrenal axis without the mediation of PVN neurones projecting to the median eminence. However, the loss of the corticosterone response to AA and the increase in severity of inflammation in the MBH lesioned rats suggests a central (non-PVN) component mediates effects of inflammation. Furthermore, the increase in POMC mRNA in the MBH lesioned AA rats suggests that part of this process is not mediated by releasing factors in the hypothalamo-hypophysial portal system, and that extrahypothalamic(peripheral) mediators act on the pituitary during chronic inflammation. 相似文献