全文获取类型
收费全文 | 1727篇 |
免费 | 324篇 |
国内免费 | 95篇 |
出版年
2024年 | 7篇 |
2023年 | 31篇 |
2022年 | 33篇 |
2021年 | 33篇 |
2020年 | 90篇 |
2019年 | 108篇 |
2018年 | 96篇 |
2017年 | 101篇 |
2016年 | 103篇 |
2015年 | 71篇 |
2014年 | 75篇 |
2013年 | 225篇 |
2012年 | 62篇 |
2011年 | 58篇 |
2010年 | 32篇 |
2009年 | 64篇 |
2008年 | 59篇 |
2007年 | 57篇 |
2006年 | 60篇 |
2005年 | 80篇 |
2004年 | 47篇 |
2003年 | 58篇 |
2002年 | 45篇 |
2001年 | 44篇 |
2000年 | 31篇 |
1999年 | 38篇 |
1998年 | 35篇 |
1997年 | 28篇 |
1996年 | 23篇 |
1995年 | 18篇 |
1994年 | 33篇 |
1993年 | 16篇 |
1992年 | 20篇 |
1991年 | 14篇 |
1990年 | 9篇 |
1989年 | 13篇 |
1988年 | 13篇 |
1987年 | 11篇 |
1986年 | 21篇 |
1985年 | 21篇 |
1984年 | 17篇 |
1983年 | 14篇 |
1982年 | 9篇 |
1981年 | 19篇 |
1980年 | 17篇 |
1979年 | 16篇 |
1978年 | 14篇 |
1977年 | 27篇 |
1976年 | 19篇 |
1975年 | 7篇 |
排序方式: 共有2146条查询结果,搜索用时 15 毫秒
91.
Aggressive and sexual behaviour was studied in 5-min paired encounters between castrated prepubertal boars (N = 14) and normal (N = 2) or bulbectomized (N = 2) oestrogen-treated ovariectomized gilts. The boars were made sexually active by treatment with 17β-oestradiol + 5α-dihydrotestosterone. Half of the boars were sprayed on the snout with a solution containing a mixture of the boar pheromones 3α-androstenol and 5α-androstenone immediately before testing, and the remainder were treated with the vehicle solution. Aggression was almost always initiated by the gilts, and neither bulbectomy nor pheromone treatment of the boars reduced its occurrence. The results suggest that the display of aggression by gilts towards boars of similar body size is unlikely to be suppressed by the steroidal pheromones present in boar saliva. 相似文献
92.
It has been widely and regularly suggested that aggression is not a unitary concept but rather an omnibus term concealing important and distinct subclasses of behavior. Psychologists have offered various categorical schemes highlighting motivation and form as distinguishing criteria. Many writers have also noted the social relativity of dermitions of classes of aggression and called for a consideration of lay conceptions of aggressive behavior. The present paper explores the correspondence between psychologists' and laypersons' categorizations of aggressive acts. Ten short scenarios of aggression were generated to embody systematic permutations of form and motive as suggested by the published work of social psychologists. Subjects rated every pairwise combination in terms of perceived similarity. The data were subjected to three-factor, multidimensional scaling. The resulting structure indicated that subjects' ratings were not random and reflected consideration of motive (hostile, normative, instrumental, status) and of direct versus indirect form. The data were thus in close correspondence with the classifications generated by psychologists. The desirability of refining this technique and extending it to other cultural and subcultural groups is discussed. 相似文献
93.
94.
The development of prosocial behavior is traced from middle childhood to adulthood in a 22-year longitudinal study of 800 children first seen at age 8 and is compared to the development of aggression over the same period. Prosocial behavior and aggression seem to represent opposite ends of a single dimension of behavior since they are consistently negatively related to each other and relate in opposite ways to correlated variables both synchronously and over time. Both are stable forms of behavior with good predictability over the time span studied and both are related to the quality of the parent-child relationship. The most important deterrent to the development of antisocial behavior and the encouragement of prosocial behavior is probably a close identification between the child and his/her parents. 相似文献
95.
Robert J. Blanchard Charles K. Kleinschmidt Kevin J. Flannelly D. Caroline Blanchard 《Aggressive behavior》1984,10(4):309-315
The effect of fear on two types of aggression in rats was investigated by adding a cat stimulus to a colony in which the dominant male was attacking an intruder (offensive aggression), or, to a tube test situation in which defensive biting was measured before and during tail shock. The cat completely abolished offense in the colony; when the cat was presented and removed before a strange rat was placed in the colony, attack on the intruder was also reduced. In contrast, defensive biting was unchanged or even slightly potentiated by the presence of the cat, demonstrating a separation of the effects of fear on offensive and defensive aggression. 相似文献
96.
Ronald Gandelman 《Aggressive behavior》1984,10(2):123-133
Reproductive activity has been the behavior of choice for research in behavioral endocrinology. Why this is so and the consequences to the study of aggression and to behavioral endocrinology in general are explored. 相似文献
97.
Typically, functional analyses of severe problem behavior have been conducted in two ways: (a) The target response is reinforced immediately after it occurs, or (b) the target response is reinforced on some schedule thought to mimic a naturally occurring schedule. We evaluated the effects of contingency strength in reducing levels of problem behavior with 2 participants who had been diagnosed with developmental disabilities. Results showed that under a neutral contingency, one in which the probability of reinforcement for aggression was equal to the probability of reinforcement for the nonoccurrence of aggression, rates of aggression were suppressed to low levels for both participants. 相似文献
98.
Do Positive Self-Perceptions Have a “Dark Side”? Examination of the Link between Perceptual Bias and Aggression 总被引:5,自引:0,他引:5
The hypothesis that positive self-perceptions may have a dark side was investigated in the present study by examining the relationship between positively biased self-perceptions and aggression. Ratings of actual and perceived social acceptance of third-grade (n = 278), fourth-grade (n = 260), and fifth-grade (n = 321) students were compared to form a measure of perceptual bias. Peers provided nominations for overt and relational aggression. Gender differences were found for aggression (males were more overtly and relationally aggressive than females) but not perceptual bias. African-American children held more positive perceptions of their social acceptance and were perceived by peers as more aggressive than Caucasian children. Even after controlling for the effects of gender and ethnicity, more positively biased perceptions were associated with more peer nominations for overt and relational aggression. Contrary to an optimal range of bias hypothesis, even moderately positive self-perceptions were associated with elevated levels of aggression. 相似文献
99.
100.
In the current study, two mediational mechanisms, parenting practices and children's beliefs about aggression, were hypothesized to account for the relationship between perceived neighborhood danger and childhood aggression. Using structural equation modeling, data were analyzed from an inner-city school-based sample of 732 predominantly African American 5th graders. Results suggested that perceived neighborhood danger was associated with strong positive beliefs about aggression, which in turn was associated with high levels of aggression. The hypothesized mediating role of parenting practices (restrictive discipline, parental monitoring, and parental involvement) on the relation between perceived neighborhood danger and child aggression was not supported. However, the current findings suggest that children's positive beliefs about aggression mediated the relationship between restrictive discipline and aggression. Directions for future research are discussed. 相似文献