全文获取类型
收费全文 | 12723篇 |
免费 | 607篇 |
国内免费 | 5篇 |
出版年
2021年 | 110篇 |
2020年 | 173篇 |
2019年 | 186篇 |
2018年 | 296篇 |
2017年 | 276篇 |
2016年 | 301篇 |
2015年 | 206篇 |
2014年 | 257篇 |
2013年 | 1006篇 |
2012年 | 399篇 |
2011年 | 444篇 |
2010年 | 265篇 |
2009年 | 232篇 |
2008年 | 364篇 |
2007年 | 342篇 |
2006年 | 318篇 |
2005年 | 258篇 |
2004年 | 238篇 |
2003年 | 236篇 |
2002年 | 236篇 |
2001年 | 452篇 |
2000年 | 430篇 |
1999年 | 293篇 |
1998年 | 137篇 |
1997年 | 115篇 |
1996年 | 111篇 |
1992年 | 235篇 |
1991年 | 235篇 |
1990年 | 220篇 |
1989年 | 219篇 |
1988年 | 224篇 |
1987年 | 203篇 |
1986年 | 189篇 |
1985年 | 190篇 |
1984年 | 181篇 |
1983年 | 132篇 |
1982年 | 138篇 |
1979年 | 167篇 |
1978年 | 112篇 |
1977年 | 114篇 |
1975年 | 157篇 |
1974年 | 176篇 |
1973年 | 201篇 |
1972年 | 171篇 |
1971年 | 151篇 |
1970年 | 138篇 |
1969年 | 135篇 |
1968年 | 188篇 |
1967年 | 139篇 |
1966年 | 148篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
H N Levinson 《Perceptual and motor skills》1989,68(2):471-484
As prior studies indicated abnormal cerebellar-vestibular-based sensorimotor mechanisms and neurological and ENG diagnostic parameters in anxiety disorders and because ocular fixation and sequential scanning are cerebellar-vestibular-modulated, it appeared reasonable to measure these and related ocular functions in matched samples of anxiety-disordered and control subjects. In this study, the optokinetically-determined fixation, sequential scanning, and perceptual span capacities obtained by means of a newly revised blurring-speed method were significantly lower or impaired in 70 anxiety-disordered patients vs 70 controls. Such data supported further the hypothesis that there may be cerebellar-vestibular predispositions to anxiety disorders and the optokinetically-based tracking method may prove useful in separating a diverse array of CV-determined or related anxiety symptoms from those of other origins. However, independent validation as well as additional studies of anxiety disorders using larger samples vs random or "normal" controls are required before conclusions are justified. 相似文献
112.
Dynamic attending and responses to time 总被引:6,自引:0,他引:6
113.
A total of 178 reading disabled children were randomly assigned to one of three treatment conditions providing training in word recognition and decoding skills (DS), oral and written language (OWLS), or classroom survival skills (CSS. an alternative treatment control). Pre- and post-treatment comparisons on an array of standardized and experimental measures indicated that the two experimental treatments (DS, OWLS) resulted in improvement on selected tests significantly greater than that resulting from a third treatment intervention which controlled for treatment time and individual attention (CSS). Effects specific to each experimental treatment were identified, as well as some generalized treatment advantages shared by both experimental groups at post-test. These results indicate that some of the deficits associated with developmental dyslexia are amenable to treatment. Greater generalization of treatment effects was observed following the DS than the OWLS treatment. While DS-instructed children exhibited better word recognition skills, however, their knowledge of grapheme-phoneme correspondence rules was not improved. Several OWLS-specific effects observed on experimental reading and language measures were not replicated on standardized tests which purport to measure the same skills. These results are discussed with respect to (i) possible mechanisms by which disabled readers may acquire word recognition skills, (ii) their failure to acquire and use grapheme-phoneme correspondence rules, and (iii) a possible reduced tendency in the present population to generalize newly acquired specific knowledge to related knowledge domains. 相似文献
114.
Base-rate effects in category learning: a comparison of parallel network and memory storage-retrieval models 总被引:1,自引:0,他引:1
W K Estes J A Campbell N Hatsopoulos J B Hurwitz 《Journal of experimental psychology. Learning, memory, and cognition》1989,15(4):556-571
Exemplar-memory and adaptive network models were compared in application to category learning data, with special attention to base rate effects on learning and transfer performance. Subjects classified symptom charts of hypothetical patients into disease categories, with informative feedback on learning trials and with the feedback either given or withheld on test trials that followed each fourth of the learning series. The network model proved notably accurate and uniformly superior to the exemplar model in accounting for the detailed course of learning; both the parallel, interactive aspect of the network model and its particular learning algorithm contribute to this superiority. During learning, subjects' performance reflected both category base rates and feature (symptom) probabilities in a nearly optimal manner, a result predicted by both models, though more accurately by the network model. However, under some test conditions, the data showed substantial base-rate neglect, in agreement with Gluck and Bower (1988b). 相似文献
115.
116.
In this study, 18 older (over age 65, M = 75.61 years) and 18 younger (below age 40 and over age 17, M = 26.44 years) healthy volunteers were tested on verbal and visuospatial recall. Tasks were matched on discriminating power. Older Ss performed worse than younger Ss on both tasks. The older Ss also showed a larger deficit in visuospatial than in verbal recall, relative to the younger Ss. These results are consistent with the theory of aging according to which verbal tasks are more resistant to deterioration than are nonverbal tasks. A psychological explanation based on lifetime experience with verbal material is preferred over the physiological explanation advocating faster aging of the right hemisphere. 相似文献
117.
Age differences in the acculturation process 总被引:1,自引:0,他引:1
Age differences were assessed in a conceptual model that seeks to explain how acculturation affects psychological well-being among Mexican Americans. The data were from a national probability sample of 859 persons of Mexican decent. It was hypothesized that low acculturation creates financial stress. Moreover, low acculturation and financial stress were in turn predicted to erode feelings of personal control and self-esteem. Finally, diminished feelings of control and low self-esteem were hypothesized to exert a negative impact on psychological well-being. When data from respondents of all ages was assessed, empirical support was found for all of the hypotheses except the linkage between acculturation and financial stress. However, few age differences emerged in the model. The authors conclude that older Mexican Americans may not be more vulnerable to the stressors associated with acculturation. 相似文献
118.
Frontal lobe dysfunction and memory impairment in patients with chronic progressive multiple sclerosis 总被引:2,自引:0,他引:2
Deficits in semantic encoding have been described in patients with frontal lobe disease who also show memory impairments. As a group, patients with multiple sclerosis (MS) exhibit memory impairment, fail to make effective use of semantic encoding to aid memory, and perform poorly on verbal fluency and concept formation tests which are sensitive to frontal lobe damage. In the present study the semantic encoding capacity of MS patients was measured using a modification of Wicken's release from proactive interference (PI) paradigm. Individual patients varied considerably in the severity of their impairments on verbal fluency, verbal recognition memory and on Wisconsin Card Sorting Task, but even patients who evidenced both memory impairment and signs of frontal lobe dysfunction showed normal release from PI after a categorical shift. Memory disturbances in MS are unlikely to result from an incapacity for semantic encoding, which seems preserved in MS, but may arise instead from deficits in processing information rapidly. 相似文献
119.
Robert N. Hughes 《Current Psychology》1989,8(2):144-150
With a minimal intratrial interval, male golden hamsters spontaneously alternated significantly less often in a T-maze than
females. Since there was no sex difference in choice latencies, the alternation difference could not be accounted for by longer
intertrial intervals experienced by males. Instead, the difference was ascribed to faster rates of habituation to novelty
in females because they showed greater between-sessions declines in open-field ambulation than males. From an analysis of
rearing scores it was concluded that attempts to escape from the apparatus may have been the principal motivating influence
in both the T-maze and open field. 相似文献
120.