全文获取类型
收费全文 | 11222篇 |
免费 | 336篇 |
国内免费 | 2篇 |
出版年
2020年 | 105篇 |
2019年 | 140篇 |
2018年 | 160篇 |
2017年 | 183篇 |
2016年 | 225篇 |
2015年 | 167篇 |
2014年 | 201篇 |
2013年 | 1175篇 |
2012年 | 353篇 |
2011年 | 396篇 |
2010年 | 283篇 |
2009年 | 275篇 |
2008年 | 376篇 |
2007年 | 421篇 |
2006年 | 406篇 |
2005年 | 360篇 |
2004年 | 336篇 |
2003年 | 354篇 |
2002年 | 361篇 |
2001年 | 161篇 |
2000年 | 187篇 |
1999年 | 161篇 |
1998年 | 184篇 |
1997年 | 163篇 |
1996年 | 166篇 |
1995年 | 156篇 |
1994年 | 158篇 |
1993年 | 131篇 |
1992年 | 144篇 |
1991年 | 139篇 |
1990年 | 120篇 |
1989年 | 125篇 |
1988年 | 126篇 |
1987年 | 132篇 |
1986年 | 133篇 |
1985年 | 147篇 |
1984年 | 151篇 |
1983年 | 159篇 |
1982年 | 175篇 |
1981年 | 169篇 |
1980年 | 155篇 |
1979年 | 131篇 |
1978年 | 168篇 |
1977年 | 157篇 |
1976年 | 147篇 |
1975年 | 143篇 |
1974年 | 144篇 |
1973年 | 139篇 |
1972年 | 105篇 |
1968年 | 74篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
161.
Robert L. Savoy 《Attention, perception & psychophysics》1984,36(6):571-576
A McCollough effect was induced in subjects by having them view typical adapting stimuli binocularly for 5 min. In the control condition, the strength of the McCollough effect was measured 20 min after the end of the adaptation. The strength was measured during monocular and binocular viewing of a test pattern via a color cancellation technique. Monocular strengths for the two eyes of a given subject were equal to each other and slightly weaker than the binocular strength. In the test condition, 15 min of the 20 min between adaptation and testing were spent monocularly viewing black and white gratings of the same orientation and spatial frequency as the adapting gratings. The strength of the effect as measured ipsilaterally was markedly decreased from that in the control condition. The strength of the effect as measured with the contralateral eye showed only a small decrease from that of the control condition. This finding is relevant to various models of the McCollough effect and related color aftereffects, especially those that posit a “learning” type of mechanism between achromatic spatial channels (which exhibit clear interocular transfer of various achromatic effects) and monocular color channels. 相似文献
162.
An electronic device for detecting movement in small animals is described. The principle involves assessing changes in resistance between pairs of grid bars in a cage. The device is inexpensive, sensitive to movement, easy to calibrate and install, reliable across different activity arenas, and indifferent to animal size. 相似文献
163.
A radiotelemetry system for continuous monitoring of the temperature and/or location of small animals is described. All the functions of system control are carried out by an on-line microcomputer (TRS-80 Model III), resulting in a versatile system capable of alternating recording the temperature/location of multiple subjects with other behavioral or physiological events, such as activity level. We describe the use of this system in monitoring body temperature in hamsters and in recording the incubation pattern of breeding ring doves. 相似文献
164.
165.
166.
Peter M. Monti Robert Boice Allan L. Fingeret William R. Zwick David Kolko Sandra Munroe Aimee Grunberger 《Behaviour research and therapy》1984,22(6):651-660
This paper reports the development and assessment of midi-level behavioral measures of social anxiety in the context of two experiments, one studying an analog student sample, the other a psychiatric sample. Judgments on nine categories of clinically practical midi-level behaviors (e.g. Facial Expression, Orienting, Sense of Timing), based on a review of the literature on human ethology and on pilot research, were compared to global judgments of social anxiety and social skill and to physiological arousal. Intraclass correlations exceeded 0.80 for judgments of the global and midi-level behavioral ratings on both samples. Results of correlational analyses indicated that while there were several significant predictors of global skill and anxiety among the midis, the magnitude of the relationship between midis and globals was stronger for the patient than the student sample. Further analyses based on S's heart rate (HR) reactivity suggested that while global ratings did not significantly predict H R in a high social anxiety situation, one midi-level behavioral rating (self-manipulations) did. The clinical utility of the newly developed measures is discussed with particular attention to their practicality for behavior therapy. 相似文献
167.
168.
Robert S. Pierce 《Brain and language》1984,22(2):339-349
This study assessed 13 aphasic subjects' knowledge of the multiple meanings of homographs. The results indicated that the various meanings were less available to aphasic subjects than to normal subjects. In addition, specific meanings became less available as they became less typical although the number of meanings associated with a homograph did not influence performance. Aphasia type also did not influence performance. Performance on the experimental test was significantly correlated with auditory comprehension level and picture naming ability. The results were related to recent findings on semantic organization in aphasia. 相似文献
169.
Dr. Robert Lichtenstein 《Journal of abnormal child psychology》1984,12(1):79-93
Parents of 391 preschool children ages 49 to 64 months completed a brief developmental inventory as part of a preschool screening program operated by an urban school district. The 28-item developmental inventory assessed adaptive behavior and language development. In addition, preschool children were administered the Minneapolis Preschool Screening Instrument. Teacher ratings of kindergarten performance the following year provided criterion data to validate the screening measures. Correlations with the overall teacher rating [the mean of nine ratings] were .40 for the adaptive behavior scale and .57 for the language scale. Validity figures for the developmental inventory were significantly higher for low SES than for high SES children, for older children [57 to 64 months] than for younger children [49 to 56 months], and for firstborn children than for younger siblings. No effects were found by sex. While a positive relationship between parent reports of developmental functioning and early school performance was clearly established, validity levels did not justify use of parent information as a sole source of preschool screening information.This research was supported in part by a grant from the Bureau of Education for the Handicapped. 相似文献
170.
A sample of 2,453 grade school children were followed into young adulthood through record sources. Teacher interviews provided information about low-peer-status children that was assessed in relation to subsequent delinquency for both sexes and young adult criminality for males. A multivariate design evaluated the joint effects of social class, a measure of family disturbance, and childhood problem behavior factors as antecedents of delinquency. Childhood aggression emerged as the most prominent antecedent factor for males but not for females. Social class and family disturbance were associated with aggression but did not have significant direct effects on delinquency. Aggression was related to severity of delinquency. Dispositional status, reflecting severity, was the best indicator of which delinquent males would have adult criminal records. A causal model is presented.The study was supported by a grant from the Scottish Rite Schizophrenia Research Program, N.M.J., U.S.A. Portions of the study were presented at the Life History Research conference in Monterey, California, 1981. The authors wish to thank June White, Cindy Hanson, and Ned Worell for their help in conducting this research. Data for this research was originally gathered by Merrill Roff. Follow-up data were contributed by Ronald Peek, Donald Bamber, Charles Watson, Shiela Makie, William S. Ward, Edward S. Posey, Chris Hemlabs, and Harriet Barnes. 相似文献