全文获取类型
收费全文 | 4674篇 |
免费 | 11篇 |
国内免费 | 1篇 |
出版年
2019年 | 14篇 |
2018年 | 115篇 |
2017年 | 99篇 |
2016年 | 191篇 |
2015年 | 103篇 |
2014年 | 39篇 |
2013年 | 71篇 |
2012年 | 266篇 |
2011年 | 257篇 |
2010年 | 23篇 |
2009年 | 34篇 |
2008年 | 38篇 |
2007年 | 35篇 |
2006年 | 46篇 |
2005年 | 1321篇 |
2004年 | 659篇 |
2003年 | 446篇 |
2002年 | 138篇 |
2001年 | 30篇 |
2000年 | 13篇 |
1999年 | 30篇 |
1998年 | 7篇 |
1996年 | 5篇 |
1994年 | 11篇 |
1992年 | 26篇 |
1991年 | 44篇 |
1990年 | 59篇 |
1989年 | 44篇 |
1988年 | 28篇 |
1987年 | 42篇 |
1986年 | 39篇 |
1985年 | 30篇 |
1984年 | 26篇 |
1983年 | 23篇 |
1982年 | 5篇 |
1979年 | 34篇 |
1978年 | 11篇 |
1977年 | 7篇 |
1976年 | 12篇 |
1975年 | 29篇 |
1974年 | 32篇 |
1973年 | 30篇 |
1972年 | 25篇 |
1971年 | 26篇 |
1970年 | 17篇 |
1969年 | 19篇 |
1968年 | 16篇 |
1967年 | 17篇 |
1966年 | 16篇 |
1965年 | 7篇 |
排序方式: 共有4686条查询结果,搜索用时 33 毫秒
881.
Laidre ME 《Animal cognition》2008,11(2):179-187
Studies of intraspecific behavioral variability have documented cases where behaviors are present in some populations or groups
but are absent in others. In some cases these differences cannot be explained by recourse to environmental or genetic variation,
and may instead represent “traditions”. Despite many examples of animal traditions in acoustic communication, relatively few
examples exist of gestural traditions. Here I report on a study of communication across eight captive groups of mandrills
(Mandrillus sphinx) in which a prominent gesture (Hand extension) was unique to two groups. Habitat variability, genetic differences, and sampling
bias were not sufficient to account for the gesture’s limited distribution across the study groups. Within the two groups
where the gesture did occur only the juveniles in the group performed it, consistently directing it toward adults. Quantitative
analysis of the contexts and responses associated with the gesture suggested that juveniles utilized it to provoke adults.
Moreover, the gesture appeared to minimize the risk juveniles incurred while inciting adults, suggesting that repeated social
interactions shaped the gesture’s form. Interestingly, both the groups where the gesture emerged contained few juveniles.
With limited play partners, these juveniles may have resorted to harassing adults as an alternative social play outlet. The
creation of this novel gesture may thus be due to the combined influence of a shortage of play partners and of the increased
free time for playful social exploration afforded by captivity. Although juveniles frequently “eavesdropped” on dyadic interactions
involving the gesture and would subsequently initiate an interaction with the recipient of the gesture, there was no definitive
evidence for social transmission; the gesture could instead have been independently invented by each juvenile.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
882.
883.
Lars Nyberg Lillemor Lundin-Olsson Bj?rn Sondell Anders Backman Kenneth Holmlund Staffan Eriksson Michael Stenvall Erik Rosendahl Marcus Maxhall Gustaf Bucht 《Cyberpsychology & behavior》2006,9(4):388-395
Falls and fall-related injuries are a major problem for elderly persons. Most falls occur during walking and turning, and the risk of falling increases when attention is diverted to something besides walking. It is often difficult to standardize methods for testing balance and fall tendency in a clinically relevant setting. We describe the development of a system using a virtual environment (VE) to assess how attention demanding and unexpected events influence a person's capacity to control balance and movement. The hardware in the system consists of a head-mounted display (HMD), a magnetic tracker system, and two SGI computers. The software consists of the image generation of the VE and the management and visualization of motion tracking data. In a preliminary pilot study eight subjects (age 23-80) participated. Each subject walked on a normal floor and was visually presented a familiar outdoor environment in the HMD. They were exposed to different unexpected events, such as a virtual snowfall and tilting of the VE. Disturbances of balance and walking patterns such as changes in speed, stride length and balance reactions like slipping were observed. Two subjects experienced symptoms of cyber sickness with a SSQ score above 25 points. Walking with sensors only did not affect walking time, but in VE the subjects generally walked more slowly. Virtual tilting of the environment had an impact on balance performance during walking. This effect was not observed while the test subjects were walking in a virtual snowfall. The model needs further development but may hold a potential for clinical use. 相似文献
884.
Lo?c Lemoine Kjerstin Torre Delignières Didier 《Revue canadienne de psychologie expérimentale》2006,60(4):247-257
A number of recent papers have suggested that the series of time intervals produced in continuation tapping may have fractal properties. This proposition, nevertheless, was only based on the visual appraisal of graphical results, and was not statistically supported. In the present study, we applied the ARMA/ARFIMA modeling procedures proposed by Wagenmakers, Farrell, and Ratcliff (2005) to test for the presence of long-range dependencies in continuation tapping data. Our results demonstrate the presence of long-range dependencies in most series and offer strong support for the hypothesis that fluctuations in tapping series are fractal in nature. 相似文献
885.
To make technology research more effective and to deal with fierce cost competition, technology research should be more focused
on radical innovation and needs to adopt a more end-user-focused approach. Product improvement is already quite often building
on knowledge collected around consumers’ experiences with these products to come with a next, improved generation of products.
However, in case of creating novel products from “scratch,” this will be more difficult. The user-centered research approach
including insights, scenarios, and experience prototypes provides a good method to incorporate the consumer perspective in
the earliest stages of the product creation process. The development of the Ambilight TV will be used as a case to illustrate
this approach. 相似文献
886.
Borgogno F 《American journal of psychoanalysis》2007,67(3):221-234
The aim of this paper is to present the close link between Ferenczi's and Winnicott's theoretical, clinical and therapeutic thought, indicating how this link has become something of a “missing link” in the history of psychoanalytic ideas, an implication which we retain, in part, to this day. In the first part entitled “Who's speaking to whom?”, I aim to explore the contents of the most essential parts of their messages, stressing the similarities and differences between them, and citing the most important authors whom they address (Freud for Ferenczi, Klein for Winnicott). In the second part, I aim to tackle the general direction underlying both their work and their lives, concentrating specifically on “the maternal”, and examining the repercussions of this aspect on psychoanalytic technique and practice. In the third part, as a kind of “Parting”, I will present further brief conclusions on the relevance and significance of their thoughts in modern day psychoanalysis, defining Ferenczi and Winnicott as “founders of future discursiveness”. 相似文献
887.
Some researchers argue that task switching involves task-set reconfiguration-that is, changing the existing task set to perform
a different task. Although this idea is intriguing, it is often unclear what is reconfigured and which processes are involved
in reconfiguration. We addressed these issues by defining task sets, identifying differences between them, and obtaining evidence
that was diagnostic of reconfiguration. In two experiments, subjects performed relative judgment tasks that involved comparing
a target with a reference point that repeated or switched across trials. The task was the same on every trial, but the task
set was not, because a task-set parameter-the reference point-had to be changed. Target-reference point distance effects that
changed with the reference point provided diagnostic evidence that reconfiguration occurred, and this reconfiguration led
to switch costs. We discuss how our approach can be generalized to define reconfiguration more clearly in other task-switching
situations. nt|mis|This research was supported by Grants BCS 0133202 and BCS 0446806 from the National Science Foundation
to G.D.L. 相似文献
888.
Jens F?rster Nira Liberman Ronald S Friedman 《Personality and social psychology review》2007,11(3):211-233
Countless studies have recently purported to demonstrate effects of goal priming; however, it is difficult to muster unambiguous support for the claims of these studies because of the lack of clear criteria for determining whether goals, as opposed to alternative varieties of mental representations, have indeed been activated. Therefore, the authors offer theoretical guidelines that may help distinguish between semantic, procedural, and goal priming. Seven principles that are hallmarks of self-regulatory processes are proposed: Goal-priming effects (a) involve value, (b) involve postattainment decrements in motivation, (c) involve gradients as a function of distance to the goal, (d) are proportional to the product of expectancy and value, (e) involve inhibition of conflicting goals, (f) involve self-control, and (g) are moderated by equifinality and multifinality. How these principles might help distinguish between automatic activation of goals and priming effects that do not involve goals is discussed. 相似文献
889.
We aimed to expand upon the demographic characteristics and gender differences among those who have met someone on the Internet who they later met offline and had sex with as well as any relationship with cybersex, sexually transmitted infections, and online sexual problems. We analyzed data collected through an online questionnaire in 2002 in Sweden including a total population of 1836 respondents of which 1458 used the Internet for sexual purposes. Of those, 35% men and 40% women reported to have met offline sex partners online. The majority reported an occurrence of one to two times, whereas 10% reported six or more times. The analysis suggested women aged 34-49 and 50-65 years, homo- and bisexual men, and singles more likely to have this experience. They were also more likely to have engaged in cybersex. No relationships were found with sexually transmitted infections or online sexual problems. The results suggest that using the Internet to find sex partners may be less hazardous for the general Internet users than pointed out by prior research about this behavior often focusing on specific sub groups of Internet users. 相似文献
890.