全文获取类型
收费全文 | 3758篇 |
免费 | 202篇 |
出版年
2024年 | 7篇 |
2023年 | 39篇 |
2022年 | 41篇 |
2021年 | 73篇 |
2020年 | 81篇 |
2019年 | 113篇 |
2018年 | 149篇 |
2017年 | 149篇 |
2016年 | 165篇 |
2015年 | 116篇 |
2014年 | 133篇 |
2013年 | 455篇 |
2012年 | 203篇 |
2011年 | 228篇 |
2010年 | 133篇 |
2009年 | 135篇 |
2008年 | 186篇 |
2007年 | 150篇 |
2006年 | 133篇 |
2005年 | 101篇 |
2004年 | 121篇 |
2003年 | 125篇 |
2002年 | 97篇 |
2001年 | 75篇 |
2000年 | 82篇 |
1999年 | 56篇 |
1998年 | 41篇 |
1997年 | 36篇 |
1996年 | 21篇 |
1995年 | 24篇 |
1994年 | 21篇 |
1993年 | 14篇 |
1992年 | 37篇 |
1991年 | 26篇 |
1990年 | 45篇 |
1989年 | 43篇 |
1988年 | 37篇 |
1987年 | 21篇 |
1986年 | 30篇 |
1985年 | 29篇 |
1984年 | 22篇 |
1983年 | 18篇 |
1982年 | 16篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 15篇 |
1978年 | 11篇 |
1972年 | 11篇 |
1966年 | 6篇 |
1938年 | 6篇 |
排序方式: 共有3960条查询结果,搜索用时 15 毫秒
911.
There is an ongoing debate about how best to conceptualize the unconscious. Early psychodynamic views employed theories influenced by physics to explain clinical material, while subsequent cognitivist views relied on computational models of the mind to explain laboratory data. More recently, advances in cognitive-affective neuroscience have provided new insights into the workings of unconscious cognition and affect. We briefly review some of this recent work and its clinical implications. 相似文献
912.
The authors show how the use of inequality constraints on parameters in structural equation models may affect the distribution of the likelihood ratio test. Inequality constraints are implicitly used in the testing of commonly applied structural equation models, such as the common factor model, the autoregressive model, and the latent growth curve model, although this is not commonly acknowledged. Such constraints are the result of the null hypothesis in which the parameter value or values are placed on the boundary of the parameter space. For instance, this occurs in testing whether the variance of a growth parameter is significantly different from 0. It is shown that in these cases, the asymptotic distribution of the chi-square difference cannot be treated as that of a central chi-square-distributed random variable with degrees of freedom equal to the number of constraints. The correct distribution for testing 1 or a few parameters at a time is inferred for the 3 structural equation models mentioned above. Subsequently, the authors describe and illustrate the steps that one should take to obtain this distribution. An important message is that using the correct distribution may lead to appreciably greater statistical power. 相似文献
913.
Puryear M Weissman G Watson M Mann M Strickland B van Dyck PC 《Mental retardation and developmental disabilities research reviews》2006,12(4):288-292
Newborn screening and genetic technologies are expanding and changing rapidly, increasing the demand for genetic specialty services. Because of the scarcity and geographic maldistribution of genetic specialty services, access to these services is a critical issue. This article discusses some of the efforts initiated by the Maternal and Child Health Bureau of the Health Resources and Services Administration, particularly the establishment of regional genetic and newborn screening collaboratives to improve access to these services and expertise. 相似文献
914.
Task switching requires the ability to flexibly switch between task rules and responses, and is sensitive to developmental change. We tested the hypothesis that developmental changes in task switch performance are associated with changes in the facilitating or interfering effect of the previously retrieved stimulus-response (S-R) association. Three age groups (7-8-year-olds, 10-12-year-olds and 20-25-year-olds) performed a two-choice reaction time (RT) task in which spatially compatible or incompatible responses were required. The RT costs associated with switching between tasks were larger when responses were repeated than when responses were alternated. Younger children showed a greater cost than adults when switching between tasks but repeating responses. This age difference decreased when the interval between the previous response and the upcoming stimulus increased. Switch costs were larger when switching to the compatible task than to the incompatible task, but this effect did not differ between age groups. These findings suggest that young children build up stronger transient associations between task sets and response sets, which interfere with their ability to switch to currently intended actions. A similar pattern has previously been observed for older adults (Mayr, 2001), suggesting a common contributor to task switching deficits across the life span. 相似文献
915.
van Nooten J Oh H Pierce B Koning FJ Jadad AR 《The journal of pastoral care & counseling : JPCC》2006,60(4):387-394
A systematic review was undertaken of the literature on the use of the Internet and other information and communication technologies (ICT's) in the provision and support of religious and spiritual care in healthcare. Indexes such as Medline, PsychoINFO and Proquest Religion were searched. The review found little systematic study of the effectiveness of the Internet and other ICT's in religious and spiritual care. It is believed that the results of this review provide a basis for promise spiri care in the further explora of the potential and of ICT's for tual healthcare. 相似文献
916.
This study investigated in 2 experiments whether reflexive cuing of attention that occurs after perception of a gaze cue is greater for fearful than for happy faces in normal participants, as hypothesized from a social neuroscience perspective. To increase neuroecological validity, dynamic stimulus presentation was used to display faces that simultaneously morphed from a neutral expression into a happy or fearful one and shifted eye gaze from the center to the periphery. Shifts of attention resulting from a natural fearful gaze were expected to be related to participants' anxiety traits, in agreement with the often found increased selective attention to threat in anxious participants. Both hypotheses were confirmed: Fearful faces induced stronger gaze cuing than happy faces, and the strength of this cuing effect was correlated to participants' anxiety levels. These results suggest a neural network, which integrates the processing of gaze, expression, and emotional states to adaptively prime vigilance under threatening circumstances. 相似文献
917.
Motives for UV exposure have been shown to be related to appearance concerns, yet little research has examined specific tan appearance attitudes. Given this lacuna, Study 1 involved the identification of six factors among college female tanners: general attractiveness, media influence, family/friends influence, physical fitness appearance, acne reasons, and skin aging concerns. In Study 2, a separate sample of college female tanners were used to validate a higher order factor model, which demonstrated acceptable fit. Additionally, the factors converged in the expected directions, with the general attractiveness and skin aging concerns being the best correlate of UV exposure and sun-protection intentions. The relevance of these findings to skin cancer prevention is discussed. 相似文献
918.
In psychological experiments involving multiple trials, the order in which individual trials are presented to participants
influences the results obtained. For this reason, experimenters often create carefully constrained experimental lists or check
randomly generated lists to avoid known causes of order artifacts (e.g., short-term stimulus or response repetition). Creating
appropriately structured pseudorandom lists can be a difficult and time-consuming task in generating psychological experiments.
Mix is a Windows program that can generate pseudorandomized orders according to complex, user-specified constraints. Mix can
be used to generate a novel item order for each individual participant, even for complex experiments in which stimulus and/or
response repetition is an experimental variable of interest, or for which automated randomization would not normally be possible.
The program also contains a number of other practical features for generating files for use with a variety of experiment control
software. A Mix executable for Windows, a complete manual, and terms of use are available at www.mrc-cbu.cam.ac.uk/personal/maarten.van-casteren/Mix.htm.
Use is limited to academic or other nonprofit applications. 相似文献
919.
Sexually functional (N=26) and sexually dysfunctional heterosexual men with psychogenic erectile disorder (N=23) viewed two sexually explicit videos. Performance demand was manipulated through verbal instruction that a substantial genital response was to be expected from the videos. Self-focused attention was manipulated by introducing a camera pointed at the participant. Dispositional self-consciousness was assessed by questionnaire. Performance demand was found to independently inhibit the genital response. No main effect of self-focus was found. Self-focus inhibited genital response in men scoring high on general and sexual self-consciousness traits, whereas it enhanced penile tumescence in low self-conscious men. Inhibition effects were found in both volunteers and patients. No interaction effects of performance demand and self-focus were found. Subjective sexual arousal in sexually functional men was highest in the self-focus condition. In sexually dysfunctional men, subjective sexual response proved dependent on locus of attention as well as presentation order. 相似文献
920.
Genetic and environmental mechanisms underlying stability and change in problem behaviors at ages 3, 7, 10, and 12 总被引:4,自引:0,他引:4
Bartels M van den Oord EJ Hudziak JJ Rietveld MJ van Beijsterveldt CE Boomsma DI 《Developmental psychology》2004,40(5):852-867
Maternal ratings on internalizing (INT) and externalizing (EXT) behaviors were collected in a large, population-based longitudinal sample. The numbers of participating twin pairs at ages 3, 7, 10, and 12 were 5,602, 5,115, 2,956, and 1,481, respectively. Stability in both behaviors was accounted for by genetic and shared environmental influences. The genetic contribution to stability (INT: 43%; EXT: 60%) resulted from the fact that a subset of genes expressed at an earlier age was still active at the next time point. A common set of shared environmental factors operated at all ages (INT: 47%; EXT: 34%). The modest contribution of nonshared environmental factors (INT: 10%; EXT: 6%) could not be captured by a simple model. Significant age-specific influences were found for all components, indicating that genetic and environmental factors also contributed to changes in problem behavior. 相似文献