全文获取类型
收费全文 | 175761篇 |
免费 | 7764篇 |
国内免费 | 163篇 |
专业分类
183688篇 |
出版年
2021年 | 1510篇 |
2020年 | 2786篇 |
2019年 | 3448篇 |
2018年 | 3586篇 |
2017年 | 4023篇 |
2016年 | 4671篇 |
2015年 | 3926篇 |
2014年 | 4800篇 |
2013年 | 23451篇 |
2012年 | 4764篇 |
2011年 | 3841篇 |
2010年 | 3986篇 |
2009年 | 4796篇 |
2008年 | 4045篇 |
2007年 | 3633篇 |
2006年 | 4175篇 |
2005年 | 4115篇 |
2004年 | 3596篇 |
2003年 | 3220篇 |
2002年 | 3035篇 |
2001年 | 3368篇 |
2000年 | 3210篇 |
1999年 | 3214篇 |
1998年 | 2825篇 |
1997年 | 2655篇 |
1996年 | 2568篇 |
1995年 | 2434篇 |
1994年 | 2380篇 |
1993年 | 2342篇 |
1992年 | 2686篇 |
1991年 | 2477篇 |
1990年 | 2375篇 |
1989年 | 2257篇 |
1988年 | 2253篇 |
1987年 | 2260篇 |
1986年 | 2220篇 |
1985年 | 2408篇 |
1984年 | 2537篇 |
1983年 | 2332篇 |
1982年 | 2372篇 |
1981年 | 2338篇 |
1980年 | 2191篇 |
1979年 | 2253篇 |
1978年 | 2193篇 |
1977年 | 2149篇 |
1976年 | 1958篇 |
1975年 | 2031篇 |
1974年 | 2081篇 |
1973年 | 1982篇 |
1972年 | 1530篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Alan E. Kazdin 《Journal of abnormal child psychology》1989,17(4):437-454
This study evaluated commonly used methods of identifying depressed children and examined the extent to which the conclusions about correlates of dysfunction vary among different selection criteria. Child psychiatric patients (N=237,ages 7–12) and their parents participated and completed measures to permit identification of depressed children on the basis of three separate criteria, including selfreport scores on the Children's Depression Inventory, parent-reported scores for the same measure, and a DSM-III diagnosis of major depression. The study examined whether depressed and nondepressed children, defined separately by the different criteria, differed in a variety of depression-related symptoms, cognitive processes, and social activity. The results indicated little overlap in the persons identified as depressed on the basis of child-or parent-completed CDI scores or DSM-III diagnosis. Depressed and nondepressed children tended to differ across all domains (depression-related symptoms, cognitive processes, and social activity) for each selection criterion. However, significant differences were evident in these domains only when the selection criterion and other domains were assessed with the same informant (e.g., self-report) and hence shared a common method (rater) component. The findings underscore the potential influence that method factors may have in influencing the conclusions that are drawn regarding the correlates of childhood depression.Completion of this research was supported by a Research Scientist Development Award (MH00353) and by a grant (MH35408) from the National Institute of Mental Health. The author is grateful to Debra Bass, Antoinette Rodgers, and Todd Siegel for assistance with this project. 相似文献
992.
The effects of right and left hemiparkinsonism on prosody 总被引:2,自引:0,他引:2
Recent studies show right hemisphere dominance in the mediation of emotional prosody and left hemisphere contribution to linguistic prosody in patients with cortical injury. The present study investigated emotional and linguistic functions of prosody as well as facial and musical processing in 21 patients with lateralized subcortical disease. Fourteen right hemiparkinsonians (RPD) and 7 left hemiparkinsonians (LPD) were compared to 17 normal controls (NC). Patients were impaired on receptive and expressive tests of emotional and linguistic prosody. Patients were also selectively impaired on emotional processing of facial stimuli and in the musical processing of pitch and tonal memory, though not timber. These findings suggest that monotone speech reported in PD is of multimodal origins and may involve dysfunction in neural centers involved in emotional and linguistic processing. There were no differences between RPD and LPD groups in the pattern of deficits, suggesting bilateral involvement in emotional processing at the subcortical level. 相似文献
993.
Two groups of singers (n = 12,13) and a group of nonsingers (n = 12) each produced the national anthem by (1) speaking and (2) singing the words and by (3) humming the melody. Regional cerebral blood flow (rCBF) was measured at rest and during each phonation task from seven areas in each hemisphere by the 133Xe-inhalation method. Intrahemisphere, interhemisphere, and global rCBF were generally similar across phonation tasks and did not yield appreciable differences among the nonsingers and the singers. 相似文献
994.
Neuropsychological functioning in hemiparkinsonism 总被引:3,自引:0,他引:3
A standardized neuropsychological battery including measures of intellectual cognitive, memory, attention-concentration, language, abstraction and mental flexibility, and sensory and motor functions was administered to 21 hemiparkinsonian patients (14 with right side and 7 with left side symptoms) and 17 controls matched for age and education. Patients were impaired in all functions except sensory. For motor functions, impairment was ipsilateral to the side of symptoms. For cognitive functions, right side symptoms were associated with verbal deficits whereas left side symptoms were associated with spatial deficits. Thus, a pattern of neuropsychological deficits consistent with the lateralization of motor symptoms may appear in the early stages of the disease. 相似文献
995.
The "generation effect" is a phenomenon in which words that are generated by the subject are remembered better than words which are read. The present experiments examined this effect in patients with mild-to-moderate dementia of the Alzheimer type (DAT), healthy elderly adults, and young adults under a variety of different encoding and retrieval conditions. Experiment 1 employed an intentional learning task with multiple study/test trials using the same list of words. While both the young and elderly adults exhibited higher recall for internally generated words than read words, the DAT patients failed to demonstrate the effect even after repeated exposures to the same stimulus list. Experiment 2 replicated this same pattern of results using an incidental learning paradigm with both recall and recognition tests. Various explanations as to why the DAT patients failed to show the generation effect were discussed with particular emphasis placed on the role of semantic memory and encoding failure. 相似文献
996.
Ms. Cherie Sutherland B.A. 《Journal of Near-Death Studies》1989,8(2):93-102
This study examines the incidence of reports of psychic phenomena and associated beliefs both before and after the near-death experience (NDE). The near-death experiencers interviewed reported no more psychic phenomena before the NDE than the general population. There was a statistically significant increase following the NDE in the incidence of 14 of 15 items examined. 相似文献
997.
998.
Dr. Juan C. Saavedra-Aguilar M.D. Lic. Juan S. Gómez-Jeria Lic.Q. 《Journal of Near-Death Studies》1989,7(4):265-272
This work has received financial support from FONDECYT (Project 1111-88). The authors also acknowledge the helpful comments of Dr. Bruce Cassels. 相似文献
999.
1000.
Insight without awareness: On the interaction of verbalization, instruction and practice in a simulated process control task 总被引:5,自引:0,他引:5
William B. Stanley Robert C. Mathews Ray R. Buss Susan Kotler-Cope 《The Quarterly Journal of Experimental Psychology Section A: Human Experimental Psychology》1989,41(3):553-577
Four experiments in which subjects learned to control two versions of a complex simulated process control task show that verbalizable knowledge of procedures used to perform these tasks is very limited and is acquired late in learning. Individual learning curves associated with these tasks showed sudden improvements in performance, which were not accompanied by a similar increase in verbalizable knowledge. It was also found that verbal instructions consisting of exemplar memorization, strategies for rule induction, simple heuristics, and experts' instructions were all effective in enhancing novice subjects' performance. A theoretical framework is proposed in which subjects draw on two separate but interacting knowledge structures to perform these tasks. One knowledge structure is based on memory for past experiences (close analogies), and the other is based on one's current mental model of the task. Implicit sets of competing rules that control response selection are derived from both sources of knowledge. It is suggested that dissociations between task performance and verbalizing occur because memory-based processing tends to have more control over response selection because of its greater specificity, whereas a mental model tends to be the preferred mode for verbal reporting because of its greater accessibility. 相似文献