全文获取类型
收费全文 | 1957篇 |
免费 | 127篇 |
出版年
2021年 | 22篇 |
2020年 | 30篇 |
2019年 | 36篇 |
2018年 | 46篇 |
2017年 | 64篇 |
2016年 | 49篇 |
2015年 | 43篇 |
2014年 | 45篇 |
2013年 | 180篇 |
2012年 | 74篇 |
2011年 | 69篇 |
2010年 | 54篇 |
2009年 | 59篇 |
2008年 | 95篇 |
2007年 | 71篇 |
2006年 | 63篇 |
2005年 | 72篇 |
2004年 | 71篇 |
2003年 | 60篇 |
2002年 | 56篇 |
2001年 | 61篇 |
2000年 | 67篇 |
1999年 | 58篇 |
1998年 | 33篇 |
1997年 | 28篇 |
1996年 | 29篇 |
1995年 | 25篇 |
1994年 | 20篇 |
1993年 | 24篇 |
1992年 | 24篇 |
1991年 | 26篇 |
1990年 | 22篇 |
1989年 | 21篇 |
1988年 | 18篇 |
1987年 | 28篇 |
1986年 | 15篇 |
1985年 | 19篇 |
1984年 | 18篇 |
1981年 | 12篇 |
1980年 | 13篇 |
1979年 | 18篇 |
1978年 | 12篇 |
1977年 | 15篇 |
1976年 | 13篇 |
1974年 | 19篇 |
1971年 | 14篇 |
1968年 | 12篇 |
1967年 | 12篇 |
1966年 | 18篇 |
1965年 | 14篇 |
排序方式: 共有2084条查询结果,搜索用时 31 毫秒
51.
The effects of maternal employment and non-maternal infant care on development at two and four years
Differences in maternal employment during children's first year of life and children's entry into non-maternal care before the age of 1 year failed to predict differences in cognitive and socioemotional development at 2 and 4 years of age, after family background variables were controlled. Two samples were studied: a population sample of 1100 Bermudian children and a smaller subsample of children most of whom were determined to be at risk for developmental problems. To assess the effects of maternal employment, we compared infants with mothers who worked 20 or more hours a week to infants with mothers who worked less than 20 hours a week. To assess the effects of entry into non-maternal care before the age of one, we compared infants who were placed in regular non-maternal care before the age of one versus infants who did not experience regular non-maternal care before the age of one. The results revealed that family background variables frequently predicted many child outcome measures in both the total sample and the smaller research sample. After controlling for family characteristics, no differences were found between children whose mothers worked 20 or more hours a week when they were infants and children with mothers who worked less than 20 hours a week in either sample. In addition, age of entry into non. maternal care before the age of one did not significantly predict any child outcome measures. 相似文献
52.
William Forde Thompson 《Attention, perception & psychophysics》1994,56(3):363-374
In four experiments, listeners’ sensitivity to combinations of pitch and duration was investigated. Experiments 1–3 involved “textures” of notes, which were created by repeatedly sounding one of two notes (e.g., C4 quarter note; D4 eighth note), so that each note had an equal chance of occurring at any point within a texture. Experiment 1 showed that if a texture change was effected by introducing a pitch or duration that was not in the initial texture, the change was perceived by both attentive and distracted listeners. If a texture change was effected by combining the pitch of one note with the duration of the other note in the initial texture, and vice versa, it was perceived only if the listeners were attentive. Sensitivity to pitch/duration combinations was poorer when the pitch difference between component notes of textures was increased (Experiment 2), but it was better when the difference in duration between component notes was increased (Experiment 3). In Experiment 4, listeners’ sensitivity to combinations of pitch pattern and durational pattern in brief sequences was examined. Listeners were sensitive to the manner in which parameter patterns were combined when they were attentive, but not when they were distracted. The results are discussed in view of featureintegration theory and its application to music cognition. 相似文献
53.
54.
55.
Suzanne C. Thompson Kalin Anderson Debra Freedman Joye Swan 《Journal of applied social psychology》1996,26(3):189-210
The role that costs, benefits, and perceptions of invulnerability play in condom use was examined in a sample of students ( N = 211) at 4-year and 2-year colleges. In multiple regression analyses, past condom use was related to relative invulnerability, low present risk, and inexperience. Less intended condom use was associated with high perceptions of relative invulnerability and low perceptions of present risk. It appears that many college students feel protected from HIV because they judge their current sexual environment to be safe due to monogamy, sexual history taking, and the ability to tell a partner's HIV status. Independent of that, feelings of relative invulnerability are associated with more condom use—perhaps an accurate judgment of past risky behavior. 相似文献
56.
Nancy C. Grace Rachel Thompson Wayne W. Fisher 《Journal of applied behavior analysis》1996,29(2):239-242
Assessment and treatment of covert self-injurious behavior are complicated because it is difficult to quantify and apply differential consequences to covert responses. In this study, both tangible and social reinforcers were identified using reinforcer assessment methods. These reinforcers were then provided contingent upon the absence of tissue damage identified during physical examinations, resulting in near 100% success in physical assessment checks that was maintained over 10 months. 相似文献
57.
Wayne W. Fisher Steven E. Lindauer Cindy J. Alterson Rachel H. Thompson 《Journal of applied behavior analysis》1998,31(4):513-527
In the current investigation, 2 participants with mental retardation displayed property destruction and stereotypy, and both responses involved the same materials (e.g., breaking and tapping plastic objects). Three experiments were conducted (a) to indirectly assess the functions of these two responses, (b) to determine their relation to one another, and (c) to develop a treatment to reduce the more serious behavior, property destruction. In Experiment 1, previously destroyed materials were either present or absent, and their presence reduced property destruction but not stereotypy. In Experiment 2, matched toys (ones that produced sensory stimulation similar to stereotypy) were either present or absent, or were replaced by unmatched toys (for 1 participant). Matched toys produced large reductions and unmatched toys produced small reductions in property destruction and stereotypy. In Experiment 3, attempts to pick up undestroyed objects were either blocked or not blocked while matched toys were continuously available. Response blocking reduced property destruction (and attempts), prevented stereotypy, and increased manipulation of matched toys. These results suggest that the two aberrant responses formed a chain (e.g., breaking and then tapping the object), which was maintained by the sensory consequences (e.g., auditory stimulation) of the terminal response, and that previously destroyed material or matched toys made the initial response (property destruction) unnecessary. 相似文献
58.
DISORDERED EATING AND PERCEPTIONS OF CHILDHOOD ABUSE AMONG WOMEN IN A PRIMARY CARE SETTING 总被引:1,自引:0,他引:1
Michael W. Wiederman Randy A. Sansone Lori A. Sansone 《Psychology of women quarterly》1998,22(3):493-497
Research has demonstrated links between sexual abuse and disordered eating among women in college student and mental health samples. Little is known about such relationships among women from other samples or the relationship between other forms of childhood abuse as well as disordered eating (vomiting, starvation, laxative abuse). Prevalence of disordered eating was significantly higher among women who indicated a perceived childhood history of sexual, physical, or emotional abuse or who had personally witnessed violence. 相似文献
59.
Bonnie Jeanne Baty Leslie Cohen Lorna Phelps Marcy C. Speer Pamela Stengel Lori Williamson-Kruse 《Journal of genetic counseling》1996,5(3):139-145
Considerable scientific evidence demonstrates the reduction in risk for neural tube defects (NTDs) associated with maternal preconceptional folic acid supplementation. The National Society of Genetic Counselors (NSGC) endorses the U.S. Public Health Service recommendations for folic acid supplementation at the 0.4 mg level for women in the general population and at the 4.0 mg level for women at high or increased risk for NTD pregnancies for at least 4 weeks prior to active pursuit of conception. We encourage targeted educational efforts and surveillance to assess results of this dietary supplementation. The NSGC further urges the Food and Drug Administration to fortify staple foodstuffs with folic acid for a population-based approach to minimize the number of NTD births. 相似文献
60.
A. H. Thompson 《Personality and individual differences》1985,6(6):775-778
Considering the findings that schizophrenics have been found to show relatively slow reaction times (RTs), and often do not benefit from ordinarily helpful information (e.g. a warning signal), the present study investigated the relationship between these variables and psychoticism (P). One hundred and three male Ss were administered a questionnaire which provides a measure of P. In addition, all Ss were tested on an RT task under unsignalled (i.e. no warning signal) and signalled conditions. The results showed that the expected improvement in reaction speed with a warning signal was of a lesser magnitude for those high on P. Furthermore, the difference was due to the faster RTs for high P scorers in the unsignalled condition. The data suggest that high P scorers are like schizophrenics in that they show less benefit from a warning signal, but are dissimilar in terms of reaction speed in an unsignalled task. 相似文献