全文获取类型
收费全文 | 6808篇 |
免费 | 127篇 |
国内免费 | 2篇 |
出版年
2023年 | 31篇 |
2022年 | 22篇 |
2021年 | 39篇 |
2020年 | 68篇 |
2019年 | 73篇 |
2018年 | 208篇 |
2017年 | 185篇 |
2016年 | 287篇 |
2015年 | 167篇 |
2014年 | 108篇 |
2013年 | 329篇 |
2012年 | 388篇 |
2011年 | 381篇 |
2010年 | 99篇 |
2009年 | 94篇 |
2008年 | 127篇 |
2007年 | 146篇 |
2006年 | 120篇 |
2005年 | 1398篇 |
2004年 | 722篇 |
2003年 | 513篇 |
2002年 | 213篇 |
2001年 | 76篇 |
2000年 | 49篇 |
1999年 | 65篇 |
1998年 | 37篇 |
1997年 | 24篇 |
1996年 | 22篇 |
1995年 | 20篇 |
1994年 | 31篇 |
1993年 | 25篇 |
1992年 | 49篇 |
1991年 | 52篇 |
1990年 | 69篇 |
1989年 | 53篇 |
1988年 | 36篇 |
1987年 | 58篇 |
1986年 | 54篇 |
1985年 | 39篇 |
1984年 | 38篇 |
1983年 | 32篇 |
1979年 | 40篇 |
1976年 | 20篇 |
1975年 | 33篇 |
1974年 | 36篇 |
1973年 | 34篇 |
1972年 | 27篇 |
1971年 | 28篇 |
1970年 | 19篇 |
1969年 | 19篇 |
排序方式: 共有6937条查询结果,搜索用时 31 毫秒
91.
Albert S. Bregman Pierre Ahad Jean Kim Leanne Melnerich 《Attention, perception & psychophysics》1994,56(2):155-162
The question of whether sudden increases in the amplitude of pure-tone components would perceptually isolate them from a more complex spectrum was investigated in two experiments. In Experiment 1, a 3.5-sec noise was played as a masker. During the noise, two pure-tone components of different frequencies appeared in succession. Subjects were asked to judge whether the pitch sequence went up or down. The rise time of these components had only a small and inconsistent effect on discrimination. In Experiment 2, the 3.5-sec background signal was a complex tone. The amplitudes of two of its components were incremented in succession. Again, subjects judged whether the pitch pattern went up or down. This time there was a sizable, monotonic effect of the rise time of the increments, with more rapid increments leading to better discrimination. The difference between the two results is interpreted in terms of the auditory system’s response to changing and unchanging signals and the role of its “sudden-change” responses in attracting perceptual processing to certain spectral regions. 相似文献
92.
93.
Inhibition of protein synthesis by anisomycin for a short duration impairs memory of a one-trial inhibitory avoidance task in rats. Memory of escape conditioning involving eight trials is disrupted only if the duration of protein synthesis is prolonged by repeated injections. In marked contrast, olfactory memory of rats trained on two odor discriminations is not affected by anisomycin even if the duration of inhibition is prolonged and the number of trials is reduced to a minimum. In previous work, leupeptin, a thiol proteinase inhibitor, was shown to impair olfactory discrimination learning, but left inhibitory and avoidance conditioning intact. Together, these results provide a pharmacological double dissociation of memory, and suggest that the same chemistries, or mixtures of chemistries, may not be involved in all types of memory. 相似文献
94.
95.
T Werka J Sk?r H Ursin 《Journal of comparative psychology (Washington, D.C. : 1983)》1978,92(4):672-681
Lesions localized to specific areas of the amygdala and overlying cortex in rats produced differential effects in several behavioral tasks. Three different types of lesions were tested: central, basolateral, and cortex lateral to the amygdala. Lesions restricted to the central nucleus produced increased activity on all parameters studied in an open-field test, but the other two groups were not changed. In one-way active avoidance all three groups with lesions showed deficits. The most pronounced change was observed in the central group. All groups showed the same degree of retention loss, but in forced extinction of one-way active avoidance after retraining, the cortical and basolateral groups were most defective. A fear-reduction hypothesis is proposed for the central lesion. The basolateral and cortical areas may be more specifically involved in passive avoidance behavior. 相似文献
96.
G E Kühne J U Grünes W Knorr L Perina H Richter U Rommel R Sorger H St?ck N Waldow 《Psychiatrie, Neurologie, und medizinische Psychologie》1978,30(2):104-115
The antidepressants desipramine and imipramine were compared within the framework of a multiclinical study performed under the conditions of a controlled clinical experiment. There has been found a time-different remission of affective symptoms, which was not detectable for the inhibition of drive. The tachythymoleptic action of desipramine is discussed with reference to these results. Evaluation of the possibility of controlling affects shows different ranges of activity of desipramine and imipramine, with desipramine influencing especially negative psychoenergetic symptoms in the area of drives and emotions and imipramine, restrictive symptoms in addition to differential phenomena of the psychomotor expression. 相似文献
97.
G G?llnitz 《Psychiatrie, Neurologie, und medizinische Psychologie》1978,30(5):270-276
The author gives a brief survey of the development of Child-Neuropsychiatry in the G.D.R. and subsequently gives reasons for the decision in favor of the unity of neurology and psychiatry as applied to children and juveniles, which is in contrast to developments in other countries. In addition to hygienic, economic, organizational, and medical considerations, this decision was also determined by the fact that a Child-Neuropsychiatrist must, in his practical work as a subspecialist, be able to head a multiprofessional team and, thus, help assure optimum development of a child's personality. 相似文献
98.
99.
100.
This study shows that sex is an important status variable in occupational settings. The basic hypothesis that males, because of a status prerogative, would be more likely than females to use nonverbal and verbal dominance behaviors, including intimate gestures, toward their opposite sex co-workers was confirmed. Subjects (88 female and 69 male samples from two institutions of higher learning) reported dominance behaviors (a) toward opposite sex co-workers; (b) from opposite sex co-workers; (c) toward opposite sex superiors; and (d) from opposite sex superiors. Analysis of the sexual dominance items revealed that sexual intimacy is expressable along the same continuum as traditional dominance gestures. The hypothesis that sex competes with other status variables was supported. If the sexual dominance patterns explored in this study prove widespread, institutions may wish to provide programs aimed at raising employee awareness of these interactions. 相似文献