全文获取类型
收费全文 | 2140篇 |
免费 | 141篇 |
出版年
2023年 | 13篇 |
2022年 | 15篇 |
2021年 | 24篇 |
2020年 | 50篇 |
2019年 | 56篇 |
2018年 | 100篇 |
2017年 | 95篇 |
2016年 | 91篇 |
2015年 | 53篇 |
2014年 | 83篇 |
2013年 | 215篇 |
2012年 | 121篇 |
2011年 | 115篇 |
2010年 | 59篇 |
2009年 | 66篇 |
2008年 | 113篇 |
2007年 | 108篇 |
2006年 | 84篇 |
2005年 | 74篇 |
2004年 | 74篇 |
2003年 | 82篇 |
2002年 | 72篇 |
2001年 | 44篇 |
2000年 | 41篇 |
1999年 | 25篇 |
1998年 | 29篇 |
1997年 | 21篇 |
1996年 | 27篇 |
1995年 | 18篇 |
1994年 | 20篇 |
1993年 | 11篇 |
1992年 | 18篇 |
1991年 | 15篇 |
1990年 | 16篇 |
1989年 | 14篇 |
1988年 | 19篇 |
1987年 | 14篇 |
1986年 | 10篇 |
1985年 | 15篇 |
1984年 | 17篇 |
1983年 | 7篇 |
1982年 | 15篇 |
1981年 | 8篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1978年 | 15篇 |
1977年 | 7篇 |
1976年 | 12篇 |
1973年 | 7篇 |
1966年 | 6篇 |
排序方式: 共有2281条查询结果,搜索用时 15 毫秒
91.
Recurrent suicidal behaviors in patients with Borderline Personality Disorder (BPD) are often considered communicative gestures; however, 10% complete suicide. This study seeks to identify risk factors for suicide within a BPD sample by comparing patients with High- and Low-Lethality attempts. BPD attempters (n = 113) were assessed on demographic, diagnostic, and personality variables: clinical symptoms, suicidal behaviors; childhood, family, and treatment histories; social adjustment; and recent life events. Forty-four High-Lethality attempters, defined by a score of 4 or more on Beck's Medical Lethality Scale, were compared to 69 Low-Lethality attempters. Discriminating variables were entered in a multivariate logistic regression model to define predictors of High-Lethality status. High-Lethality attempters were older, with children, less education, and lower socioeconomic class (SES) than Low-Lethality attempters. They were more likely to have Major Depressive Disorder (MDD), co-morbid Antisocial Personality Disorder (ASPD), and family histories of substance abuse. They reported greater intent to die, more lifetime attempts, hospitalizations, and time in the hospital. High-Lethality status was best predicted by low SES, co-morbid ASPD, extensive treatment histories, and greater intent to die. These characteristics resemble profiles of patients who complete suicide, are not specific for BPD, and do not include impulsivity, aggression, or severity of BPD criteria. 相似文献
92.
Jaakkola K Fellner W Erb L Rodriguez M Guarino E 《Journal of comparative psychology (Washington, D.C. : 1983)》2005,119(3):296-303
In 2 experiments, bottlenose dolphins (Tursiops truncatus) judged the ordinal relationship between novel numerosities. The dolphins were first trained to choose the exemplar with the fewer number of items when presented with just a few specific comparisons (e.g., 2 vs. 6, 1 vs. 3, and 3 vs. 7). Generalization of this rule was then tested by presenting the dolphins with all possible pairwise comparisons between 1 and 8. The dolphins chose the exemplar with the fewer number of items at levels far above chance, showing that they could recognize and represent numerosities on an ordinal scale. Their pattern of errors was consistent with the idea of an underlying analog magnitude representation. 相似文献
93.
Developing human-nonhuman chimeras in human stem cell research: ethical issues and boundaries 总被引:1,自引:0,他引:1
The transplantation of adult human neural stem cells into prenatal non-humans offers an avenue for studying human neural cell development without direct use of human embryos. However, such experiments raise significant ethical concerns about mixing human and nonhuman materials in ways that could result in the development of human-nonhuman chimeras. This paper examines four arguments against such research, the moral taboo, species integrity, "unnaturalness," and human dignity arguments, and finds the last plausible. It argues that the transfer of human brain or retinal stem cells to nonhuman embryos would not result in the development of human-nonhuman chimeras that denigrate human dignity, provided such stem cells are dissociated. The article provides guidelines that set ethical boundaries for conducting such research that are consonant with the requirements of human dignity. 相似文献
94.
To continue research assessing the validity of the Balloon Analog Risk Task (BART) as a measure of risk taking, the BART was administered to a nonforensic sample of individuals with varying levels of psychopathic characteristics. Construct validity of the BART was evaluated by measuring risk-taking behavior in relation to self-reported psychopathy, anxiety, psychophysiological data, and demographic variables. Supporting the construct validity of the BART, while controlling for variance accounted for by interrelated variables in the context of hierarchical regression analyses, higher self-reported psychopathy was significantly predictive of increased risk taking on the BART. Findings also revealed interesting gender differences in self-reported psychopathy and a trend for men to engage in riskier behavior. Limitations and research directions are presented. 相似文献
95.
Visual word recognition is commonly argued to be automatic in the sense that it is obligatory and ballistic. The present experiments
combined Stroop and visual search paradigms to provide a novel test of this claim. An array of three, five, or seven words
including one colored target (a word in Experiments 1 and 2, a bar in Experiment 3) was presented to participants. An irrelevant
color word also appeared in the display and was either integrated with or separated from the colored target. The participants
classified the color of the single colored item in Experiments 1 and 3 and determined whether a target color was present or
absent in Experiment 2. A Stroop effect was observed in Experiment 1 when the color word and the color target were integral,
but not when the color word and the color target were separated. No Stroop effect was observed in Experiment 2. Visual word
recognition is contingent on both the distribution of spatial attention and task demands. 相似文献
96.
Orienting to a signal source is widely viewed asautomatic in the sense that it is triggered by the stimulus. However, this behavior is typically assessed in a context in which the
subject knows beforehand what he or she has to do. In the present experiments, the role of task set was investigated by having
the response vary randomly from trial to trial. On some trials, a cue signaled the subject to respond, and on the remaining
trials, another cue signaled the subject to withhold a response. Stimulus contrast and temporal overlap between task cue and
target were manipulated. The effect of a reduction in stimulus contrast was sometimes absorbed into the time taken to decode
the cue, but critically, other times not. These results highlight the theoretical importance of considering task set as an
essential element in processing, and they undermine the theoretical claim that putatively automatic processes are not subject
to interference from other mental activities. 相似文献
97.
Wigal SB McGough JJ McCracken JT Biederman J Spencer TJ Posner KL Wigal TL Kollins SH Clark TM Mays DA Zhang Y Tulloch SJ 《Journal of attention disorders》2005,9(1):275-289
Mixed amphetamine salts extended release (MAS XR; Adderall XR) and atomoxetine (Strattera) were compared in children 6 to 12 years old with attention deficit/hyperactivity disorder (ADHD) combined or hyperactive/impulsive type in a randomized, double-blind, multicenter, parallel-group, forced-dose-escalation laboratory school study. Primary efficacy measure was the SKAMP (Swanson, Kotkin, Agler, M-Flynn, and Pelham) behavioral rating scale. Changes in mean SKAMP deportment scores from baseline were significantly greater for MAS XR (n = 102) than for atomoxetine (n = 101) overall (-0.56 and -0.13, respectively; p < .0001) and at each week (p < .001). Adverse events were similar for both treatment groups. The extended time course of action and greater therapeutic efficacy of MAS XR suggests that it is more effective than atomoxetine in children with ADHD. 相似文献
98.
Over a century's worth of research suggests that "perception" without awareness is a genuine phenomenon. However, relatively little research has explored the question of whether all visually presented information activates representations in long term memory without awareness. Two experiments explored the use of a figure-ground display consisting of competing views in which one view dominates the other such that subjects are (initially) unaware of the non-dominant view. Neither experiment provided evidence that the non-dominant view (an embedded word) activated its representation in long term memory when the subject failed to report being aware of the embedded word in that priming was not seen on a subsequent stem completion task. In contrast, priming was seen when subjects reported being aware of the embedded word. It is suggested that two competing figure-ground relations are not concurrently computed unconsciously. 相似文献
99.
Nicholas Long Barbara-Jeanne Austin Mary M. Gound Abesie O. Kelly Adrienne A. Gardner Rick Dunn Stacy B. Harris Kim S. Miller 《Journal of child and family studies》2004,13(1):47-65
The Parents Matter! Program (PMP) has developed three interventions for parents of 4th and 5th grade African-American children (9–12 years old). The overarching goal of all three interventions is to provide parents with knowledge, skills, and support for enhancing their efforts to raise healthy children. The interventions are: (1) Enhanced Communication and Parenting (five 2
-hour sessions), (2) Brief Communication and Parenting (single 2
-hour session), and (3) General Health (single 2
-hour session). This article discusses the development of these interventions, presents an overview of the content of each intervention, and discusses issues related to the facilitation/presentation of these interventions. 相似文献
100.
The influence of neurological and demographic variables on neuropsychological test performance was examined in 100 9-to 16-year-old children with traumatic brain injury (TBI). Regression analyses were conducted to determine the relative contributions of coma, neuroimaging findings, ethnicity, socioeconomic status, and gender to variance in performance on the Wechsler Intelligence Scale for Children-Third Edition (WISC-III), California Verbal Learning Test--Children's Version (CVLT-C), and the Children's Category Test. Both neurological and demographic variables contributed to performance on various WISC-III factor index scores as well as the CVLT-C. No evidence for a moderating effect of demographic variables was found, but speed of information processing mediated the effect of neurological and demographic variables on CLVT-C performance. It is concluded that demographic variables have an incremental effect on the neuropsychological test performance of children with TBI above and beyond the influence of injury severity. 相似文献