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The visual perception of human movement from sparse point-light walkers is often believed to rely on local motion analysis. We investigated the role of local motion in the perception of human walking, viewed from the side, in different tasks. The motion signal was manipulated by varying point lifetime. We found the task of coherence discrimination, commonly used in biological motion studies, to be inappropriate for testing the role of motion. A task requiring temporal information showed a strong performance drop when fewer points were used or when the image sequence was sampled and displayed at a reduced frame rate. Irrespective of the frame rate, performance did not vary with point lifetime. We concluded that local motion is not required for the perception of tested biological movements, suggesting that the analysis of biological motion does not benefit from examining local motion. The reliance of perception on the number of displayed points and frames supports the idea that biological motion is perceived from a sequence of spatiotemporally sampled forms. 相似文献
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Peter R. Gross Georg H. Eifert 《Journal of psychopathology and behavioral assessment》1990,12(4):345-358
The present study examined the nature of generalized anxiety, which was defined as the constellation of symptoms listed as diagnostic criteria for generalized anxiety disorder in DSM-III-R. Generalized anxiety was assessed by means of a questionnaire that was especially constructed for this study. Although multidimensional scaling of symptoms reported by a clinically anxious sample produced orthogonal anxiety and panic dimensions, many symptoms were common to both dimensions. Whereas worry was found to be the cardinal feature of generalized anxiety, respiratory symptoms were found to associate closely with panic. These dimensions were replicated in a student sample. It is argued that while generalized anxiety symptoms constitute a unique dimension in the field of anxiety disorders, both panic and generalized anxiety may be linked with a basic anxiety response system. The findings also indicated that worry associated more closely with generalized anxiety than did apprehensive expectations. The heuristic value of the findings are discussed in light of the issue relating to an anxiety-panic continuum. 相似文献
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Georg Northoff 《Axiomathes》2016,26(3):219-252
Neuroscience has made enormous progress in understanding the brain and its various neuro-sensory and neuro-cognitive functions. However, despite all progress, the model of the brain as well as its ontological characterization remain unclear. The aim in this first paper is the discussion of an empirically plausible model of the brain with the subsequent claim of a neuro-ecological model. Whitehead claimed that he inversed or reversed the Kantian notion of the subject by putting it back into the ecological context of the world, the so-called reformist subjectivist principle. Based on empirical evidence about the experience-dependence of the brain’s spontaneous activity, I argue for an analogous inversion or reversion with regard to the model of brain: empirical evidence is well compatible with a neuro-ecological model which extends beyond and integrates both Humean neuro-sensory and Kantian neuro-cognitive models. I conclude that a neuro-ecological and process-based model of brain and its relationship to the world may offer a novel model of brain that carries major ontological implications as they shall be discussed in the second paper. 相似文献
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Enhanced Hippocampal CA1 LTP but Normal Spatial Learning in Inositol 1,4,5-trisphosphate 3-kinase(A)-Deficient Mice 总被引:1,自引:1,他引:0 下载免费PDF全文
Kisun Jun Gildon Choi Sung-Gu Yang Kwan Yong Choi Hyun Kim Guy C.K. Chan Daniel R. Storm Claudia Albert Georg W. Mayr Chang-Joong Lee Hee-Sup Shin 《Learning & memory (Cold Spring Harbor, N.Y.)》1998,5(4):317-330
To define the physiological role of IP33-kinase(A) in vivo, we have generated a mouse strain with a null mutation of the IP33-kinase(A) locus by gene targeting. Homozygous mutant mice were fully viable, fertile, apparently normal, and did not show any morphological anomaly in brain sections. In the mutant brain, the IP4 level was significantly decreased whereas the IP3 level did not change, demonstrating a major role of IP33-kinase(A) in the generation of IP4. Nevertheless, no significant difference was detected in the hippocampal neuronal cells of the wild-type and the mutant mice in the kinetics of Ca2+ regulation after glutamate stimulation. Electrophysiological analyses carried out in hippocampal slices showed that the mutation significantly enhanced the LTP in the hippocampal CA1 region, but had no effect on the LTP in dentate gyrus (DG). No difference was noted, however, between the mutant and the wild-type mice in the Morris water maze task. Our results indicate that IP33-kinase(A) may play an important role in the regulation of LTP in hippocampal CA1 region through the generation of IP4, but the enhanced LTP in the hippocampal CA1 does not affect spatial learning and memory. 相似文献
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Nhung Hendy Georg Krammer Julie Aitken Schermer Michael D. Biderman 《International Journal of Selection & Assessment》2021,29(1):81-99
To identify faking, bifactor models were applied to Big Five personality data in three studies of laboratory and applicant samples using within‐subjects designs. The models were applied to homogenous data sets from separate honest, instructed faking, applicant conditions, and to simulated applicant data sets containing random individual responses from honest and faking conditions. Factor scores from the general factor in a bifactor model were found to be most highly related to response condition in both types of data sets. Domain factor scores from the faking conditions were found less affected by faking in measurement of Big Five domains than summated scale scores across studies. We conclude that bifactor models are efficacious in assessing the Big Five domains while controlling for faking. 相似文献