全文获取类型
收费全文 | 4241篇 |
免费 | 173篇 |
国内免费 | 2篇 |
专业分类
4416篇 |
出版年
2023年 | 47篇 |
2022年 | 47篇 |
2021年 | 59篇 |
2020年 | 97篇 |
2019年 | 90篇 |
2018年 | 142篇 |
2017年 | 151篇 |
2016年 | 154篇 |
2015年 | 121篇 |
2014年 | 131篇 |
2013年 | 448篇 |
2012年 | 241篇 |
2011年 | 188篇 |
2010年 | 129篇 |
2009年 | 123篇 |
2008年 | 182篇 |
2007年 | 201篇 |
2006年 | 144篇 |
2005年 | 131篇 |
2004年 | 137篇 |
2003年 | 131篇 |
2002年 | 117篇 |
2001年 | 79篇 |
2000年 | 81篇 |
1999年 | 70篇 |
1998年 | 39篇 |
1997年 | 44篇 |
1996年 | 37篇 |
1995年 | 39篇 |
1994年 | 30篇 |
1993年 | 36篇 |
1992年 | 42篇 |
1991年 | 37篇 |
1990年 | 44篇 |
1989年 | 32篇 |
1988年 | 30篇 |
1987年 | 43篇 |
1986年 | 32篇 |
1985年 | 33篇 |
1984年 | 38篇 |
1983年 | 32篇 |
1981年 | 24篇 |
1979年 | 37篇 |
1978年 | 21篇 |
1976年 | 25篇 |
1975年 | 25篇 |
1974年 | 24篇 |
1973年 | 18篇 |
1970年 | 19篇 |
1968年 | 18篇 |
排序方式: 共有4416条查询结果,搜索用时 0 毫秒
921.
Five studies of over 450 university students presented a comprehensive picture of computer-phobia. Three research and clinically based self-report instruments were developed to measure three nearly independent dimensions of computerphobia-computer anxiety, computer attitudes, and computer cognitions and feelings. Results indicated that older students were more computer anxious, but did not have more negative attitudes, cognitions, or feelings, than did younger students. Women had more negative attitudes than did men. Feminine-identity students showed more anxiety and negative attitudes than did masculine-identity students, regardless of gender. White students had more anxiety and more positive attitudes than did nonwhite students. Computerphobia was related to other anxiety measures (mathematics, state, and trait), but was a separate construct. Experience with computer interaction did not reduce anxiety or improve attitudes. Finally, regardless of academic major, computer-anxious students showed less computer aptitude, literacy, and interest. Implications for treating computerphobia are discussed. 相似文献
922.
The program development and first-year results of a 3-year U.S. Department of Education Fund for the Improvement of Postsecondary Education (FIPSE) grant are described. The identification of computerphobics and the types of discomfort they experience are defined. A clinically based 5-week model computerphobia reduction and skills-acquisition program is presented. Screening and assessment measures are outlined and three treatment modules—two individual treatments (systematic desensitization and thought stopping) and an information/support group—are described. The first-year results demonstrate significant pretreatment-to-posttreatment change in anxiety, attitudes, cognitions, and feelings. Plans are discussed for further evaluation and program expansion. 相似文献
923.
R Lehmitz H Müller G Kretschmer 《Psychiatrie, Neurologie, und medizinische Psychologie》1989,41(12):751-754
The use of glass slides coated with the cationic polymer polydimethyldiallylammonium-chlorid for cell enrichment procedures results in an increasing number of cells on the slicks and changed quantitative results of cell differentiation. These investigations are important for quantitative analysis of cell populations. 相似文献
924.
Regression of autonomic symptoms in alcoholic polyneuropathy 总被引:1,自引:0,他引:1
W Wetzel D Müller R D Koch 《Psychiatrie, Neurologie, und medizinische Psychologie》1989,41(9):553-555
925.
Reflexive and voluntary orienting of visual attention: time course of activation and resistance to interruption 总被引:29,自引:0,他引:29
H J Müller P M Rabbitt 《Journal of experimental psychology. Human perception and performance》1989,15(2):315-330
To study the mechanisms underlying covert orienting of attention in visual space, subjects were given advance cues indicating the probable locations of targets that they had to discriminate and localize. Direct peripheral cues (brightening of one of four boxes in peripheral vision) and symbolic central cues (an arrow at the fixation point indicating a probable peripheral box) were compared. Peripheral and central cues are believed to activate different reflexive and voluntary modes of orienting (Jonides, 1981; Posner, 1980). Experiment 1 showed that the time courses of facilitation and inhibition from peripheral and central cues were characteristic and different. Experiment 2 showed that voluntary orienting in response to symbolic central cues is interrupted by reflexive orienting to random peripheral flashes. Experiment 3 showed that irrelevant peripheral flashes also compete with relevant peripheral cues. The amount of interference varied systematically with the interval between the onset of the relevant cue and of the distracting flash (cue-flash onset asynchrony) and with the cuing condition. Taken together, these effects support a model for spatial attention with distinct but interacting reflexive and voluntary orienting mechanisms. 相似文献
926.
H Heuer M Brüwer E Wischmeyer 《Zeitschrift für experimentelle und angewandte Psychologie》1989,36(3):411-432
Dark vergence depends on the vertical direction of gaze; it decreases with raised gaze and increases with lowered gaze. The vertical direction of gaze can be varied by means or raising or lowering the eyes or by way of tilting the head forward or backward. The effects of both manipulations on dark vergence are different. According to Heuer (1988) the effects of head tilt and eye inclination on dark vergence are almost, but not exactly, additive. In Exp. 1 the hypothesis of additive effects of gaze direction and eye inclination was tested and could not be rejected. The two additive hypotheses (head tilt and eye inclination vs. gaze inclination and eye inclination) result in different predictions for dark vergence with "compensatory" head and eye inclinations, which leave the direction of gaze in space invariant. In Exp. 2 it was shown that predictions from both hypotheses deviated from the observed values of dark vergence. Thus none of the two additive hypotheses provides exact predictions of dark vergence for all possible combinations of head tilt and eye inclination. For practical purposes the approximation might be sufficient. In particular, although mean dark vergence cannot be predicted exactly, individual differences can be predicted quite accurately. 相似文献
927.
D Luszyk F Eggert R Ferstl M Blank W Müller-Ruchholtz 《Zeitschrift für experimentelle und angewandte Psychologie》1989,36(2):239-250
It has been shown that the scent of mice changes after a bone marrow transplantation. Previously obtained results were re-examined with a new design that rules out possible avoidance learning effects. Two BALB/c mice, deprived of water for 20 hours each day, were trained in a Y-maze to discriminate two fully allogeneic mice strains (C3H = S+ and C57 = S-) via their urine odor. Reinforcement for correct choice was provided by a drop of water. Urine samples of different fully allogeneic mice strains (C3H, C57 and A/J) and bone marrow transplanted chimeras (C57----C3H and C3H----C57) were submitted to different "transfer of training" -tests. In the conditioning paradigm used, the animals learn to identify S+ and also do not avoid S- after the training. The urine odor of the C57----C3H-chimeras was found to be different from the strain-specific urine odor of C3H animals. Since this change could not be found in syngeneic transplanted chimeras, it is concluded that it is caused by the graft. The experiments failed, however to demonstrate that the urine odor of allogeneic chimeras is constituted solely by donor- and recipient-specific components. 相似文献
928.
Susan J. Lederman Jack M. Loomis Deborah A. Williams 《Attention, perception & psychophysics》1982,32(2):109-116
Katz (1925) has argued that the sense of vibration underlies the tactual perception of roughness. However, Taylor and Lederman (1975) have suggested that vibration serves only to prevent the cessation of mechanoreceptor activity. In an experimental evaluation of these positions, it is shown that, although prior (selective) adaptation of the fingertip strongly affects the perceived magnitude of supraliminal vibrotactile signals, it fails to alter the perceived roughness of metal gratings. The results thus favor the Taylor and Lederman position. The paper also speculates on roughness coding by the mechanoreceptor populations present in glabrous skin of the human hand. 相似文献
929.
The reliability, construct validity, and factorial structure of three self-image instruments were assesses in a total of 80 second- and fifth-grade children. Both real self-images (children's current views of themselves) and ideal self-images (the self views to which children aspire) were assessed. the split-half and test—retest reliabilities of the instruments were adequate even for children's as young as second graders. Stronger evidence of construct validity was found for the older children, although the intercorrelation patterns for both age groups were characterized by larger correlations between assessments of real and ideal self-images using the same instrument than between assessments of the same component of the self-image across the three instruments. Contrary to predictions gener ated by developmental theory, the factor analyses provided non evidence of increasing differentiation of the self-image with age. They did, however, reveal that second and fifth graders distinguish distinctly different functional domains within their self-images. 相似文献
930.
This paper deals with the general problem of the acquisition of positive affective responses, by study of the reversal of an innate aversion to the irritant properties of chili pepper. Interviews, observations, and measurements were carried out in both Mexico and the United States. Exposure to gradually increasing levels of chili in food seems to be a sufficient condition for preference development. Chili likers are not insensitive to the irritation that it produces. They come to like the same burning sensation that deters animals and humans that dislike chili; there is a clear hedonic shift. This could be produced by association with positive events, including enhancement of the taste of bland foods, postingestional effects, or social rewards. It is also possible that the initial negative response to chili pepper is essential for the eventual liking. Chili stimulates an innate sensory “warning” system but is not harmful. The enjoyment of the irritation may result from the user's appreciation that the sensation and the body's defensive reaction to it are harmless. Eating of chili, riding on roller coasters, taking very hot baths, and many other human activities can be considered instances of thrill seeking or enjoyment of “constrained risks.” Evidence for and against various explanations of chili ingestion is presented. 相似文献