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61.
A single 24 h period of maternal deprivation (MD) in rats has been shown to induce, in adulthood, a number of abnormalities in brain and behaviour that also occur in patients with schizophrenia. However, the short-term behavioural effects of MD have not been studied in detail. Since patients with schizophrenia are characterized by a retardation of normal development, we aimed in the present study to investigate the development of control rats and rats that were exposed to MD on postnatal day 9. Compared to control animals, MD rats showed (1) a reduction in body weight, (2) an increased in reversal latency in negative geotaxis, (3) a delayed eye opening, (4) a delayed emergence of walking and rearing; and (5) a delayed emergence of the behavioural response to amphetamine (amph). On the other hand, MD and control rats responded similarly to the non-competitive NMDA antagonist MK801. These data clearly show that early MD delays development, especially of the dopaminergic system and confirm our hypothesis that MD may represent an interesting animal model for the neurodevelopmental hypothesis of schizophrenia. 相似文献
62.
The levels of intelligence among Bedouin Arab adolescents from monogamous and polygamous families living in the Negev region of Israel were examined. A shortened version of the Raven's Progressive Matrices (RPM) test (S. Elbedour, T. J. Bouchard, & Y. Hur, 1997; J. Raven, J. C. Raven, & J. H. Court, 1998) was used to assess intelligence. There were no significant test score differences between adolescents from monogamous families and adolescents from polygamous families. In addition, participants with 2 mothers tended to have lower RPM scores than those with 3 or 4 mothers, and participants with related parents tended to have lower RPM scores than participants with unrelated parents. One major finding of this study is that polygamous family marital structures tended not to have deleterious effects on the Bedouin Arab adolescents' RPM test scores. 相似文献
63.
64.
Johnny L. Matson Jay A. Sevin Margaret L. Box Kelley L. Francis Bart M. Sevin 《Journal of applied behavior analysis》1993,26(3):389-398
Three children with autism and mental retardation were treated for deficits in self-initiated speech. A novel treatment package employing visual cue fading was compared with a graduated time-delay procedure previously shown to be effective for increasing self-initiated language. Both treatments included training multiple self-initiated verbalizations using multiple therapists and settings. Both treatments were efffective, with no differences in measures of acquisition of target phrases, maintenance of behavioral gains, acquisition with additional therapists and settings, and social validity. 相似文献
65.
This article examines the use of mathematical concepts in philosophy, focusing on topology, which may be viewed as a modern supplement to geometry. We show that Plato and Parmenides were already employing geometric ideas in their research, and discuss three examples of the application of topology to philosophical problems: the first concerns the analysis of the Cartesian distinction between res extensa and res cogitans, the second the ontology of possible worlds of Wittgenstein's Tractatus, and the third Leibniz's monadology. We also consider the role of topology in mathematical explanations of the sort found in science, arguing that it can perform a role in philosophy that is of comparable importance. 相似文献
66.
Parental monitoring, assessed as (perceived) parental knowledge of the child's behavior, has been established as a consistent predictor of problem behavior. However, recent research indicates that parental knowledge has more to do with adolescents' self-disclosure than with parents' active monitoring. Although these findings may suggest that parents exert little influence on adolescents' problem behavior, the authors argue that this conclusion is premature, because self-disclosure may in itself be influenced by parents' rearing style. This study (a) examined relations between parenting dimensions and self-disclosure and (b) compared 3 models describing the relations among parenting, self-disclosure, perceived parental knowledge, and problem behavior. Results in a sample of 10th- to 12th-grade students, their parents, and their peers demonstrated that high responsiveness, high behavioral control, and low psychological control are independent predictors of self-disclosure. In addition, structural equation modeling analyses demonstrated that parenting is both indirectly (through self-disclosure) and directly associated with perceived parental knowledge but is not directly related to problem behavior or affiliation with peers engaging in problem behavior. 相似文献
67.
A developmental contextual test of a dual-cycle model of identity formation is presented. In addition to a commitment-formation cycle-represented by Marcia's (1966) classical dimensions of exploration in breadth and commitment making--the model comprises a commitment-evaluation cycle--constituted by 2 additional dimensions of exploration in depth and identification with commitment. In a sample of 402 college students assessed 4 times over 2 years, both dimensions of the commitment-formation cycle and exploration in depth increased across time. Identification with commitment showed a slight decrease across time. Latent growth curve (LGC) modeling analyses indicated that the 2 identity cycles are interwoven in a dynamic interplay that defines identity formation. Contextual influences on identity development were identified through a natural experiment. Commitment evaluation constituted the core identity cycle in the normative-progression group (i.e., students who moved on to the sophomore year). Both commitment formation and commitment evaluation were at work in the reorientation group (i.e., students who repeated their freshman year or changed their major). Implications and suggestions for future research are discussed. 相似文献
68.
When drawing real scenes or copying simple geometric figures young children are highly sensitive to parallel cues and use them effectively. However, this sensitivity can break down in surprisingly simple tasks such as copying a single line where robust directional errors occur despite the presence of parallel cues. Before we can conclude that this directional bias is a limiting case it needs to be shown that any given parallel cues are indeed being processed. We achieved this by using a texture-defined contour where parallel cues are integral to the stimulus and thus cannot be ignored. Here we report that even when prolific parallel cues must have been processed, young children make robust directional errors when copying single lines. This finding demonstrates a major constraint on young children's spatial parallel coding. 相似文献
69.
Bart Vandenabeele 《The Southern journal of philosophy》2007,45(4):565-582
In this essay, I argue that Schopenhauer's view of the aesthetic feelings of the beautiful and the sublime shows how a “dialectical” interpretation that homogenizes both aesthetic concepts and reduces the discrepancy between both to merely quantitative differences is flawed. My critical analysis reveals a number of important tensions in both Schopenhauer's own aesthetic theory—which does not ultimately succeed in “merging” Plato's and Kant's approaches—and the interpretation that unjustly reduces the value of aesthetic experience to a merely preliminary stage of ethical will‐less salvation. 相似文献
70.
Although research drew attention to the importance of both parental goal promotion and parental rearing style in explaining adolescent authoritarian submission (Right‐Wing Authoritarianism or RWA) and authoritarian dominance (Social Dominance Orientation or SDO), research failed to examine their combined effects. This study examines the relative contribution of parenting goals (i.e. extrinsic vs. intrinsic and conservation goals) and styles (i.e. need support and regulation) and their interactions in the prediction of adolescent RWA and SDO. Cross‐sectional analyses show that, whereas parenting goals and styles and their interactions predict RWA, SDO is predicted by parental goals only. However, in a second, longitudinal study, changes in RWA and SDO were predicted by parenting goals only. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献