全文获取类型
收费全文 | 3556篇 |
免费 | 159篇 |
国内免费 | 2篇 |
出版年
2020年 | 49篇 |
2019年 | 74篇 |
2018年 | 97篇 |
2017年 | 88篇 |
2016年 | 94篇 |
2015年 | 72篇 |
2014年 | 94篇 |
2013年 | 392篇 |
2012年 | 120篇 |
2011年 | 142篇 |
2010年 | 88篇 |
2009年 | 89篇 |
2008年 | 128篇 |
2007年 | 111篇 |
2006年 | 114篇 |
2005年 | 102篇 |
2004年 | 84篇 |
2003年 | 99篇 |
2002年 | 108篇 |
2001年 | 96篇 |
2000年 | 86篇 |
1999年 | 69篇 |
1998年 | 42篇 |
1997年 | 37篇 |
1996年 | 41篇 |
1995年 | 43篇 |
1994年 | 40篇 |
1993年 | 33篇 |
1992年 | 49篇 |
1991年 | 51篇 |
1990年 | 46篇 |
1989年 | 48篇 |
1988年 | 36篇 |
1987年 | 37篇 |
1986年 | 46篇 |
1985年 | 43篇 |
1984年 | 43篇 |
1983年 | 33篇 |
1982年 | 41篇 |
1981年 | 35篇 |
1979年 | 40篇 |
1978年 | 31篇 |
1975年 | 35篇 |
1974年 | 34篇 |
1973年 | 29篇 |
1972年 | 31篇 |
1970年 | 39篇 |
1968年 | 35篇 |
1967年 | 42篇 |
1966年 | 33篇 |
排序方式: 共有3717条查询结果,搜索用时 15 毫秒
991.
992.
Tamara J. Pasztor Lori K. Smith Neala K. MacDonald Gail R. Michener Sergio M. Pellis 《Aggressive behavior》2001,27(4):323-337
Play fighting in many species of squirrels can involve sexual play and aggressive play, both of which can lead to wrestling which appears superficially similar. Such convergence can make scoring of the relative frequencies of these two types of play difficult and can lead to the mistaken conclusion that they grade into one another. In this study, both staged laboratory encounters between sibling pairs and spontaneous encounters between siblings in free‐living litters of Richardson’s ground squirrels (Spermophilus richardsonii) were videotaped. Frame‐by‐frame analyses using the Eshkol‐Wachman Movement Notation were employed to record the correlated movements of attack and defense by the partners and to reveal the body areas targeted during each play bout. Whereas sexual play was organized around access to the rump, aggressive play was organized around the shoulders. Although in most cases the defender’s tactics blocked access to the respective target, when contact did occur, it involved mounting in sexual play and nosing or biting in aggressive play. Eighty‐six percent of play fights could be unambiguously categorized as either sexual or aggressive play. Of these, the majority (?80%) involved sexual play. The sex of the participants did not affect the frequency of aggressive play, but in sexual play, males initiated more attacks than females. Once initiated, each form of play fighting remained distinct—if a bout began as sexual play, it would end as sexual play. Furthermore, a counterattack following sexual play was significantly more likely to be sexual than aggressive, and vice versa for counterattacks following aggressive play. Therefore, all the evidence suggested that the two forms of play fighting were not intermixed in Richardson’s ground squirrels. Aggr. Behav. 27:323–337, 2001. © 2001 Wiley‐Liss, Inc. 相似文献
993.
David M. Smith Jessel Monteverde Edric Schwartz John H. Freeman Jr. Michael Gabriel 《Neurobiology of learning and memory》2001,76(3):403-425
The amygdala is critically involved in discriminative avoidance learning. Large lesions of the amygdala block discriminative avoidance learning and abolish cingulothalamic training-induced neuronal activity. These results indicated that amygdalar processing is critical for cingulothalamic plasticity. The larger lesions did not allow differentiation of the specific functioning of various amygdalar nuclei. Anatomical analysis showed that damage in the central (CE) nucleus of the amygdala was correlated with the severity of the behavioral deficit. The present study was carried out to determine whether smaller lesions, centered in the CE nucleus, would impair discriminative avoidance learning and block cingulothalamic plasticity. In addition, the possible role of the CE nucleus in appetitively motivated discriminative approach learning was examined for the first time. New Zealand White rabbits with CE nuclear lesions were first trained in the discriminative approach task. After attaining asymptotic performance, discriminative avoidance training sessions were alternated with continuing approach training sessions, one session each day. The rabbits with lesions were severely impaired in avoidance learning but showed no impairment of approach learning. Surprisingly, the attenuating effects of the lesions on cingulothalamic training-induced neuronal activity were more prevalent during approach learning than during avoidance learning. These results indicated that avoidance learning can be impaired by lesions centered in the CE nucleus that leave cingulothalamic plasticity largely intact and that the CE nucleus is involved in extra-cingulothalamic learning processes. 相似文献
994.
Roberta L. Babbitt Bridget A. Shore Marnie Smith Keith E. Williams David A. Coe 《Behavioral Interventions》2001,16(3):197-207
Stimulus fading procedures have repeatedly been demonstrated as effective in shaping a wide variety of new behaviors. Borrowing from this body of research, the behavioral treatment of feeding disorders presents a new area of application for stimulus fading. The purpose of this study is to demonstrate the efficacy of stimulus fading in the treatment of adipsia. Two children who ate solids, but refused all liquids, were participants in the study. Results showed that a five step fading procedure starting with a spoon and thickened liquids, and ending with a cut‐out‐cup, was successful in establishing cup drinking skills for both children. Results of the study suggest that stimulus fading can facilitate feeding skill acquisition. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
995.
996.
997.
Smith DM Loewenstein G Rozin P Sherriff RL Ubel PA 《Journal of research in personality》2007,41(4):787-803
We examined whether trait disgust sensitivity predicts well-being in colostomy patients, and whether disgust predicts stigmatizing attitudes about colostomy in non-patients. 195 patients with a colostomy returned a mailed survey including measures of disgust sensitivity, life satisfaction, mood, and feelings of being stigmatized. We also conducted an internet-survey of a non-patient sample (n = 523). In the patient sample, we observed negative correlations between a bowel-specific measure of disgust sensitivity and life satisfaction (r = -.34, p<.01), and colostomy adjustment ( r = -.42, p<.01), and a positive correlation with feeling stigmatized because of the colostomy (r = .54, p<.01). Correlations between a general trait disgust measure and these outcomes were more modest. A structural equation model indicated that colostomy patients who had high disgust sensitivity felt more stigmatized, and this was in turn strongly related to lower life satisfaction. Concordantly, in the non-patient sample we observed that disgust sensitivity was a significant, positive predictor of wanting less contact with colostomy patients (r = .22, p < .01). 相似文献
998.
999.
The authors present a theory for understanding risk for problem drinking among reservation-dwelling American Indians. The theory offers an overall framework for understanding the risk process for this group. It considers the distinction between factors that influence mean levels of American Indian problem drinking and factors that influence individual differences in American Indian drinking. It proposes important contextual differences between reservation-dwelling American Indians and Caucasians that may help explain the higher mean levels of American Indian problem drinking. The theory further holds that, within the high mean level of problem drinking characteristic of many American Indian reservations, individual differences in problem drinking can be explained by very similar personality and learning factors as those that influence problem-drinking levels for other ethnic groups. 相似文献
1000.
Comprehending envy 总被引:6,自引:0,他引:6
The authors reviewed the psychological research on envy. The authors examined definitional challenges associated with studying envy, such as the important distinction between envy proper (which contains hostile feelings) and benign envy (which is free of hostile feelings). The authors concluded that envy is reasonably defined as an unpleasant, often painful emotion characterized by feelings of inferiority, hostility, and resentment caused by an awareness of a desired attribute enjoyed by another person or group of persons. The authors examined questions such as why people envy, why envy contains hostile feelings, and why it has a tendency to transmute itself. Finally, the authors considered the role of envy in helping understand other research domains and discussed ways in which people cope with the emotion. 相似文献