首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   37051篇
  免费   816篇
  国内免费   15篇
  37882篇
  2021年   136篇
  2020年   234篇
  2019年   257篇
  2018年   3738篇
  2017年   3088篇
  2016年   2544篇
  2015年   475篇
  2014年   388篇
  2013年   1425篇
  2012年   1125篇
  2011年   2960篇
  2010年   2818篇
  2009年   1782篇
  2008年   2139篇
  2007年   2578篇
  2006年   435篇
  2005年   553篇
  2004年   509篇
  2003年   441篇
  2002年   390篇
  2001年   737篇
  2000年   767篇
  1999年   481篇
  1998年   203篇
  1997年   193篇
  1996年   148篇
  1995年   142篇
  1993年   142篇
  1992年   367篇
  1991年   324篇
  1990年   361篇
  1989年   338篇
  1988年   319篇
  1987年   293篇
  1986年   319篇
  1985年   302篇
  1984年   239篇
  1983年   205篇
  1979年   192篇
  1978年   163篇
  1975年   189篇
  1974年   246篇
  1973年   200篇
  1972年   207篇
  1971年   169篇
  1970年   149篇
  1969年   200篇
  1968年   202篇
  1967年   162篇
  1966年   182篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Recent research shows that people learning a cognitive task acquire a memory for the order of operations applied, independent of the data to which those operations were applied. We designed two experiments to show how this sequence memory is represented. Experiment 1 compared predictions based on 3 possible sequence representation methods: composition, dyad transition, and associative chain. Latency and error results from a simple sequential task supported the associative chain representation. The associative links between operations presumably enhance performance by priming subsequent operations but do not operate in an all-or-none fashion. Experiment 2 explored whether transfer items that matched the first 2 rules and first 3 elements of a training item could bias participants toward executing a composed production learned during training. Latency and undetected error results were consistent with an associative chain representation but not with additional predictions made by the composition representation. These two experiments support the representation of operation sequences in memory as an associative chain.  相似文献   
992.
Earlier work has provided experimental evidence for the existence of the primary and secondary process mental organization posited by Freud and has demonstrated that primary process effects are the more active unconsciously (Brakel et al. 2000). Primary and secondary processes were assessed by a categorization test in which qualitatively different principles could be used. In new experiments using the same stimuli, another significant implication of Freud's model was tested: that primary process mental organization has developmental priority. In these experiments, which studied 559 participants ranging in age from 3 to 80, it was found (1) that primary process mentation predominates in preschoolers; (2) that it is not until around age 7 that primary process organization is supplanted by secondary process organization; and (3) that after age 7 the predominance of secondary process organization remains remarkably stable throughout the life span.  相似文献   
993.
In a 1987 American Psychologist article, Tom Grisso summarized the state of forensic psychological assessment, noted its limitations and potential, and offered suggestions for researchers and practitioners interested in contributing to its future. Since that time, there have been many important developments in the field of forensic psychology, as well as in clinical psychology more generally, some of which were anticipated and recommended by Grisso, and some of which were not. Forensic psychology is now at a crossroads, and the specialty must make an effort to respond to current challenges if it is to aid in the administration of justice by assisting legal decision makers. The need to distinguish between and identify levels of forensic knowledge and practice, establish guidelines for practice, educate legal consumers, and devote more attention to treatment issues in forensic contexts is highlighted.  相似文献   
994.
Research on individual differences in obsessive-compulsive disorder (OCD) has focused largely on analogue models with participants experiencing sub-clinical obsessions and/or compulsions. Few studies have examined the association between normal, dimensional personality traits and obsessive-compulsive symptomatology in a clinical sample. The purpose of this study was to examine personality differences in patients with a primary diagnosis of OCD (n = 98) or major depression (n = 98) using the domains and facets of the five-factor model of personality (FFM). Patients completed the self-report version of the Revised NEO Personality Inventory (NEO PI-R). When contrasted with community controls (Revised NEO Personality Inventory (NEO-PI-R) and NEO Five-Factor Inventory (NEO-FFI) professional manual, Psychological Assessment Resources, Odessa, FL, 1992), participants with OCD were found to differ across the domains (and facets) of neuroticism, extraversion, and conscientiousness and the facets of openness and agreeableness. Further, when compared to depressed participants, those with OCD were found to be more extraverted, agreeable, conscientious and less neurotic. With the exception of the conscientiousness domain (and facets), these significant differences were maintained even after controlling for depression severity. These results highlight the unique associations between trait domains and facets of the FFM and OCD.  相似文献   
995.
This review addresses the assessment of substance use and related constructs with persons having severe and persistent mental illness. The review contains two major sections. The first section focuses on issues particular to the assessment of substance use and abuse in the context of major mental illness; these include the social and motivational context of assessment, the impact of mental status and acute symptoms, limitations associated with acute and chronic cognitive impairment, and the psychosocial relevance of assessment items. The second section highlights a selected set of substance assessment tools for use with this population; evidence for the reliability, validity, and/or feasibility of these tools is summarized. Each instrument meets the criteria of being: (a). relatively brief; (b). easy to administer and interpret; and (c). useful for treatment planning, motivational feedback, and/or monitoring change.  相似文献   
996.
Keiley MK 《Family process》2002,41(3):477-493
Conduct disorder (CD), a pervasive adolescent disorder with clinically significant antisocial behaviors, has been a difficult syndrome to treat successfully. Recently, research on affect regulation and attachment has suggested that attachment and affect regulation strategies may underlie the development of conduct disorder in adolescents, implying that attention to these factors might improve family treatment for CD. In this review of the research literature, I discuss the role of attachment and affect regulation in the development and treatment of CD. In addition, I present information about the framework, intervention protocol, and preliminary evidence of effectiveness of an attachment- and affect regulation-based intervention that has been developed and implemented with multiple-family groups of parents and incarcerated adolescents.  相似文献   
997.
Children younger than 3 years have difficulty with search tasks that involve hidden displacement. Partial visual information was provided about a ball's path as it moved toward a hiding place. Children (2.0 and 2.5 years old) saw a ball rolling down a ramp placed behind a transparent screen with 4 opaque doors. A wall, placed on the ramp and directly behind 1 of the doors, protruded above the screen and stopped the ball. Children were asked to find the ball. The transparency of the screen permitted visual tracking of the ball between the doors, but its final resting place was obscured. Both age groups were equally proficient at tracking the ball as it rolled behind the screen, but the 2.5-year-olds were more likely to reach to the correct door. Looking behavior was related to errors in the younger group in that tracking that stopped short or continued past the correct door was associated with incorrect choices.  相似文献   
998.
This study tested the hypothesis that dorsolateral prefrontal cortex deficits contribute to both working memory and long-term memory disturbances in schizophrenia. It also examined whether such deficits were more severe for verbal than nonverbal stimuli. Functional magnetic resonance imaging was used to assess cortical activation during performance of verbal and nonverbal versions of a working memory task and both encoding and recognition tasks in 38 individuals with schizophrenia and 48 healthy controls. Performance of both working memory and long-term memory tasks revealed disturbed dorsolateral prefrontal cortex activation in schizophrenia, although medial temporal deficits were also present. Some evidence was found for more severe cognitive and functional deficits with verbal than nonverbal stimuli, although these results were mixed.  相似文献   
999.
In an 18-month prospective study, community-dwelling older adults, including both spousal caregivers of dementia patients and noncaregiving controls, were examined. Participants were selected on the basis of the presence or absence of chronic depressive symptoms that exceeded a cutoff score for clinically relevant depressive symptoms on a self-report symptom measure. Compared with nondepressed older adults, those with chronic, mild depressive symptoms had poorer T cell responses to 2 mitogens from baseline to follow-up. Additionally, among individuals with depressive symptoms, older age was associated with the poorest blastogenic response to the mitogens at follow-up. These findings extend the association between depression and immune function to community-dwelling older adults with chronic, mild depressive symptoms.  相似文献   
1000.
The authors hypothesized that the relationship between conscientiousness and job performance would be stronger for persons high in agreeableness than for those low in agreeableness. Results of hierarchical moderated regression analyses for 7 independent samples of employees across diverse occupations provided support for the hypothesis in 5 of the samples. In samples supporting the hypothesis, among the highly conscientious workers, those low in agreeableness were found to receive lower ratings of job performance than workers high in agreeableness. One explanation for lack of an interaction between conscientiousness and agreeableness in the other 2 samples is that those jobs were not characterized by frequent, cooperative interactions with others. Overall, the results show that highly conscientious workers who lack interpersonal sensitivity may be ineffective, particularly in jobs requiring cooperative interchange with others.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号