全文获取类型
收费全文 | 870篇 |
免费 | 49篇 |
出版年
2020年 | 9篇 |
2019年 | 16篇 |
2018年 | 16篇 |
2017年 | 21篇 |
2016年 | 17篇 |
2015年 | 16篇 |
2014年 | 24篇 |
2013年 | 107篇 |
2012年 | 37篇 |
2011年 | 33篇 |
2010年 | 10篇 |
2009年 | 25篇 |
2008年 | 29篇 |
2007年 | 28篇 |
2006年 | 30篇 |
2005年 | 29篇 |
2004年 | 30篇 |
2003年 | 23篇 |
2002年 | 31篇 |
2001年 | 16篇 |
2000年 | 16篇 |
1999年 | 16篇 |
1998年 | 15篇 |
1997年 | 13篇 |
1996年 | 8篇 |
1993年 | 8篇 |
1992年 | 11篇 |
1991年 | 14篇 |
1990年 | 11篇 |
1989年 | 8篇 |
1988年 | 15篇 |
1987年 | 14篇 |
1986年 | 14篇 |
1985年 | 9篇 |
1984年 | 8篇 |
1983年 | 15篇 |
1982年 | 14篇 |
1981年 | 11篇 |
1980年 | 6篇 |
1979年 | 14篇 |
1978年 | 9篇 |
1977年 | 13篇 |
1976年 | 9篇 |
1975年 | 11篇 |
1974年 | 7篇 |
1973年 | 11篇 |
1969年 | 6篇 |
1968年 | 9篇 |
1967年 | 7篇 |
1962年 | 6篇 |
排序方式: 共有919条查询结果,搜索用时 15 毫秒
141.
Aja Louise Murray Tom Booth Manuel Eisner Bonnie Auyeung George Murray Denis Ribeaud 《Developmental science》2019,22(1)
Previous studies have hinted at sex differences in developmental trajectories in ADHD symptoms; however, little is known about the nature or cause of these differences and their implications for clinical practice. We used growth mixture modelling in a community‐ascertained cohort of n = 1,571 participants to study sex differences in ADHD symptom developmental trajectories across the elementary and secondary school years. Participants were measured at ages 7, 8, 9, 10, 11, 12, 13, and 15. We found that females were more likely to show large symptom increases in early adolescence while males were more likely to show elevated symptoms from childhood. For both males and females, early adolescence represented a period of vulnerability characterized by relatively sudden symptom increases. Females affected by hyperactivity/impulsivity may be more likely to be excluded from diagnosis due to current age of onset criteria. More attention should be paid to early adolescence as a period of risk for hyperactivity/impulsivity symptom onset or worsening. 相似文献
142.
Andrea S. Young L. Eugene Arnold Hannah L. Wolfson Mary A. Fristad 《Journal of abnormal child psychology》2017,45(5):1025-1037
This pilot randomized controlled trial (RCT) investigated benefits of omega-3 fatty acid supplementation and Individual-Family Psychoeducational Psychotherapy (PEP; a family-focused, cognitive-behavioral therapy) for behavior problems among youth with depression. Participants aged 7–14 with DSM-IV-TR depressive disorders (N = 72; 56.9 % male) were randomized to 1 of 4 treatment conditions: PEP + omega-3, PEP monotherapy (with pill placebo), omega-3 monotherapy, or placebo (without active intervention). At screen, baseline, and 2, 4, 6, 9, and 12 weeks post-baseline, parents completed the SNAP-IV, which assesses attention-deficit/hyperactivity disorder symptoms, oppositional defiant disorder symptoms, and overall behavior problems. At screen, baseline (randomization), 6 and 12 weeks, parents completed the Eyberg Child Behavior Inventory (ECBI), which includes Intensity and Problem scales for child behavior problems. Youth who had a completed SNAP-IV or ECBI for at least two assessments during treatment (n = 48 and 38, respectively) were included in analyses of the respective outcome. ClinicalTrials.gov.:NCT01341925. Linear mixed effects models indicated a significant effect of combined PEP + omega-3 on SNAP-IV Total (p = 0.022, d = 0.80) and Hyperactivity/Impulsivity trajectories (p = 0.008, d = 0.80), such that youth in the combined group saw greater behavioral improvement than those receiving only placebo. Similarly, youth in combined treatment had more favorable ECBI Intensity trajectories than youth who received no active treatment (p = 0.012, d = 1.07). Results from this pilot RCT suggest that combined PEP + omega-3 is a promising treatment for co-occurring behavior symptoms in youth with depression. 相似文献
143.
Gender role development was assessed in 52 father-absent and 54 father-present African American adolescents. Father-present
boys, especially those from lower-income backgrounds, had higher perceptions of their masculinity than did father-absent boys.
Lower income father-absent girls perceived themselves to be higher in masculinity than did all other girls. Consequently,
father-present adolescents tended to have more traditional gender role orientations than did those in father-absent homes.
It is argued that mothers' and fathers' different socializing strategies balance out in two-parent homes. However, in father-absent
homes, mothers' tendency to rely on and pressure their daughters fosters relatively more masculine girls, whereas a lack of
father socialization fosters less masculine boys. Implications for theory and future research are also discussed. 相似文献
144.
145.
Past research indicates that faces can be more difficult to ignore than other types of stimuli. Given the important social
and biological relevance of race and gender, the present study examined whether the processing of these facial characteristics
is mandatory. Both unfamiliar and famous faces were assessed. Participants made speeded judgments about either the race (Experiment 1)
or gender (Experiments 2–4) of a target name under varying levels of perceptual load, while ignoring a flanking distractor
face that was either congruent or incongruent with the race/gender of the target name. In general, distractor–target congruency
effects emerged when the perceptual load of the relevant task was low but not when the load was high, regardless of whether
the distractor face was unfamiliar or famous. These findings suggest that face processing is not necessarily mandatory, and
some aspects of faces can be ignored. 相似文献
146.
Sidman M 《Journal of applied behavior analysis》2011,44(4):973-991
I have written before about the importance of applied behavior analysis to basic researchers. That relationship is, however, reciprocal; it is also critical for practitioners to understand and even to participate in basic research. Although applied problems are rarely the same as those investigated in the laboratory, practitioners who understand their basic research background are often able to place their particular problem in a more general context and thereby deal with it successfully. Also the procedures of applied behavior analysis are often the same as those that characterize basic research; the scientist-practitioner will appreciate the relation between what he or she is doing and what basic experimenters do, and as a consequence, will be able to apply therapeutic techniques more creatively and effectively. 相似文献
147.
The elderly are known to exhibit declines in postural control during standing and walking, however little is known about how the elderly react under time-critical and challenging postural situations. The purpose of this study was to examine age-related differences in reaction time (RT) and the pattern of temporal coordination between center of pressure (COP), trunk and head motion during voluntary postural sway movements. Healthy young (n=10; mean=24 years; SD=5 years) and elderly men (n=8; mean=75 years; SD=2 years) stood on a force plate with tri-axial accelerometers attached to the head and lower trunk. Participants were required to generate sway in the anterior-posterior (AP) or medial-lateral (ML) direction in response to an auditory cue during two different testing conditions called Static reaction and Dynamic reaction. Static reactions involved the initiation of voluntary sway in either the AP or ML direction from quiet stance. Dynamic reactions involved an orthogonal switch of voluntary sway between the AP and ML directions. Compared to the young, elderly individuals exhibited slower RT during both Static and Dynamic reaction, and smaller differences in RT and phasing between COP, trunk, and head motion. The results of this study suggest that the elderly adopted more rigid coordination strategies compared to the young when executing a rapid change in direction of whole body motion. The rigid movement strategy of the elderly was presumably generated in an effort to compensate for increased challenge to the maintenance of stability. 相似文献
148.
Child behavior problems have been identified as being responsible for the greatest reduction in quality of life for children between ages 1 and 19. In this study, we examine whether neighborhood social processes are associated with differences in child behavior problems in an economically and racially diverse sample of 405 urban-dwelling first grade children and whether parenting behavior mediates and/or moderates the effects of neighborhoods. Furthermore, we examine whether neighborhood social processes play the same role with regards to child behavior problems at differing levels of neighborhood economic impoverishment. Results of multivariate multilevel regression analyses indicate that a high negative social climate is associated with greater internalizing problems. High potential for community involvement for children in the neighborhood was associated with fewer behavior problems, but only in economically impoverished neighborhoods. Differences in parenting behavior did not appear to mediate neighborhood effects on behavior problems, and parenting characterized by a high degree of positive involvement was associated with fewer behavior problems in all types of neighborhoods. 相似文献
149.
We examined the semantic impairment for natural kinds in patients with probable Alzheimer's disease (AD) and semantic dementia (SD) using an inductive reasoning paradigm. To learn about the relationships between natural kind exemplars and how these are distinguished from manufactured artifacts, subjects judged the strength of arguments such as "Humans have a chemical called sebum. Therefore, frogs have a chemical called sebum." These judgments depend on subjects' perception of the similarity between the familiar objects named in the premise and the conclusion. Controls rated arguments generalizing from a natural kind to an artifact as significantly weaker than arguments generalizing from one natural kind to another natural kind. SD patients demonstrated a graded profile of generalization without evidence of a categorical distinction between natural kinds and artifacts. AD patients' judgments also suggested more difficulty than controls at distinguishing between natural kinds and artifacts. Both SD patients and AD patients resembled controls in their judgments of arguments where both objects are from the natural kinds category. Semantic knowledge thus appears to be sufficiently preserved in both AD and SD to support within-category similarity judgments. We suggest that SD patients may be impaired in part at identifying the features critical to diagnosing membership in a semantic category, while AD patients' performance is consistent with their semantic categorization deficit. 相似文献
150.
The authors examined how an applicant's handshake influences hiring recommendations formed during the employment interview. A sample of 98 undergraduate students provided personality measures and participated in mock interviews during which the students received ratings of employment suitability. Five trained raters independently evaluated the quality of the handshake for each participant. Quality of handshake was related to interviewer hiring recommendations. Path analysis supported the handshake as mediating the effect of applicant extraversion on interviewer hiring recommendations, even after controlling for differences in candidate physical appearance and dress. Although women received lower ratings for the handshake, they did not on average receive lower assessments of employment suitability. Exploratory analysis suggested that the relationship between a firm handshake and interview ratings may be stronger for women than for men. (PsycINFO Database Record (c) 2008 APA, all rights reserved). 相似文献