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Bossenbroek L Kosse N Ten Hacken N Gordijn M Van der Hoeven J De Greef M 《Perceptual and motor skills》2010,111(3):936-946
To measure activity during sleep, polysomnography and actigraphy are often used. The DynaPort MiniMod measures movement intensity and body position day and night. The goal was to examine the validity of the DynaPort MiniMod in assessing physical activity and body posture during sleep. In Study A, 10 healthy participants slept with the DynaPort MiniMod and the Actiwatch for one night. In Study B, 8 participants suspected of having Obstructive Sleep Apnoea Syndrome slept for one night with the DynaPort MiniMod and underwent complete polysomnography as part of the typical care protocol. In Study A, there was a significant moderate correlation (r = .70) between the movement scores of the Actiwatch and the DynaPort MiniMod. In Study B, a high intraclass correlation (r = .84) between body posture scores of the DynaPort MiniMod and the polysomnography position sensor was observed. The DynaPort MiniMod is a valid measurement device for physical activity during sleep. 相似文献
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Klaus B. Bærentsen Hans Stødkilde-Jørgensen Bo Sommerlund Tue Hartmann Johannes Damsgaard-Madsen Mark Fosnæs Anders C. Green 《Cognitive processing》2010,11(1):57-84
Meditation is an ancient spiritual practice, which aims to still the fluctuations of the mind. We investigated meditation with fMRI in order to identify and characterise both the “neural switch” mechanism used in the
voluntary shift from normal consciousness to meditation and the “threshold regulation mechanism” sustaining the meditative
state. Thirty-one individuals with 1.5–25 years experience in meditation were scanned using a blocked on–off design with 45 s
alternating epochs during the onset of respectively meditation and normal relaxation. Additionally, 21 subjects were scanned
during 14.5 min of sustained meditation. The data were analysed with SPM and ICA. During the onset of meditation, activations
were found bilaterally in the putamen and the supplementary motor cortex, while deactivations were found predominately in
the right hemisphere, the precuneus, the posterior cingulum and the parieto–temporal area. During sustained meditation, SPM
analysis revealed activation in the head of nucleus caudatus. Extensive deactivations were observed in white matter in the
right hemisphere, i.e. mainly in the posterior occipito–parieto–temporal area and in the frontal lobes. ICA identified 38
components including known baseline-resting state components, one of which not only overlaps with the activated area revealed
in the SPM analysis but extends further into frontal, temporal, parietal and limbic areas, and might presumably constitute
a combination of frontoparietal and cinguloopercular task control systems. The identified component processes display varying
degrees of correlation. We hypothesise that a proper characterisation of brain processes during meditation will require an
operational definition of brain dynamics matching a stable state of mind. 相似文献
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Two studies examined the impact of chronic and situational self‐regulatory mechanisms on cognitive test performance. In both studies, test performance was enhanced when situationally induced regulatory mechanisms matched the chronic self‐regulatory focus of the test taker. These results support the regulatory fit hypothesis put forward in regulatory focus theory and point to the importance of compatibility between chronic and situationally induced self‐regulatory states when it comes to cognitive test performance. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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The present research relates recent work on the ease of retrieval heuristic to the impact of negative stereotypic expectations on test performance. It is argued that when individuals recall information that supports negative stereotypic expectations, this activation may impair test performance relative to conditions when no stereotypic expectations are activated. This impairment, however, should be most pronounced when the information is brought to mind with ease. If the retrieval of the respective information is associated with difficulty, the impairment should be attenuated. The results of the present study confirm this hypothesis. In line with prior research, the results suggest that the experienced ease of retrieval is an important moderator of how accessible information is used. Going beyond existing evidence on attitude and frequency judgments, the results demonstrate an impact of ease of retrieval on test performance. 相似文献
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Golly-Haring C Engelkamp J 《Journal of experimental psychology. Learning, memory, and cognition》2003,29(5):965-975
Memory for self-performed tasks (SPTs) is better than memory for experimenter-performed tasks (EPTs). In short unrelated lists of actions this effect occurs if the encoding condition is manipulated within subjects. In a between-subjects design, the enactment effect disappears (J. Engelkamp & D. Dehn, 2000; J. Engelkamp & H. D. Zimmer, 1997). These findings were explained by the item-order hypothesis, which claims that encoding order information depends on the type of encoding and design. The authors demonstrate that this differential encoding of order information in EPTs and SPTs is not effective in free recall if categorized lists are used. The use of categorized lists makes the interaction of type of encoding and design in free recall of short lists disappear, and the enactment effect reappears independent of the type of design. 相似文献