Evidence that rats discriminate between familiar and unfamiliar putative urinary odorants of adult male conspecifics

Adam [1976; Lehman and Adams, 1977] suggested that a resident rat makes an olfactory comparison of cage odor and other rat odor prior to attacking an unfamiliar conspecific intruder. The findings of the present study are consistent with the notion that rats discriminate between familiar and unfamiliar putative urinary odorants Adult male albino rats were tested for preferences between areas treated with familiar urine (11 hours pretest exposure), unfamiliar urine (no pretest exposure), and untreated areas. Subjects (N = 12) preferred areas treated with familiar urine over ones treated with unfamiliar urine (p < 0.05). Also, they (N = 12 per preference-test group) preferred areas treated with either urine over untreated ones (familiar versus clean, p < 0.01; unfamiliar versus clean, p < 0.05).     

Intermale fighting and predatory behavior in house mice: An analysis of behavioral content

Two forms of aggression, intermale and predatory, wwere compared on the basis of behavioral content. Male wild mice were presented with opponents of two types, nonaggressive male mice and crickets, and the amounts of time spent in each of 18 behaviors were recorded. Results from analyses of variance and principal components analyses indicated that the structure of behavioral content differs greatly for intermale fighting and predatory behavior. It was, therefore, concluded that the integrated patterns of beahvior were controlled by separate mechanisms for predatory versus intermale aggression.     

儿童行为与心理水平的特质推理的发展

选取4岁组、5岁组、7岁组、10岁组、12岁组儿童和成人共192名(各年龄组32名, 男女各半)为被试, 采用个别测查法考察学前和小学儿童行为与心理水平的特质推理发展。结果表明: (1)4岁时儿童已能进行行为水平的特质推理, 5岁时才能进行心理水平的特质推理, 即使用特质引发规则进行特质推理, 10岁时两者均达到成人水平。(2)4岁、5岁时儿童心理水平的特质推理显著落后于行为水平的特质推理, 至少7岁时两者处于同一水平上。(3)儿童使用概念相似规则而不是情境匹配规则进行行为预测。(4)4岁儿童不使用简单效价规则进行行为预测, 5岁及以上儿童使用简单效价规则, 但他们是在区分同一特质范畴和不同特质范畴的基础上、在较低的确定程度上使用该规则。     

The Virtues in their Place: Virtue Ethics in Medicine

Theoretical Medicine and Bioethics - We are currently in the midst of a revival of interest in thevirtues. A number of contemporary moral philosophers havedefended a virtue-based approach to...     

项目等距呈现过程中的系列位置效应

以中国汉字为材料,利用刘英茂提出的向前和向后联想的方法,证明在不同呈现时间和不同间隔时间条件下,系列位置曲线中首因效应和近因效应性质的分化过程。结果说明,系列位置曲线的近因部分对时间变化更为敏感,表现为绝对记忆的性质。系列位置曲线中首因效应和近因效应性质的分化,取决于项目呈现时间、项目间隔时间和系列包含的项目数。     

Complex learning and information processing by pigeons: a critical analysis

Three models of conditional discrimination learning by pigeons are described: stimulus configuration learning, the multiple-rule model, and concept learning. A review of the literature reveals that true concept learning is not characteristic of the behavior of pigeons in matching-to-sample, oddity-from-sample, or symbolic matching studies. Instead, pigeons learn a set of sample-specific S^D rules. Transfer of the discrimination to novel stimuli, at least along the hue dimension, is predicted by a “coding hypothesis”, which holds that pigeons make a unique, but usually unobserved response, R₁, to each sample, and that the comparison stimulus chosen depends on which R₁ was emitted in the presence of the sample. Convincing evidence is found that pigeons do code sample hues, but there is little evidence that allows one to infer that the “coding event” must have behavioral properties. Parameters of the conditional discrimination paradigm are identified, and it is shown that by appropriate parametric manipulation, a variety of analogous tasks may be generated for both human and animal subjects. The tasks make possible the comparative study of complex learning, attention, memory, and information processing, with the added advantage that behavior processes may be compared systematically across tasks.     

规则变型推理对远迁移问题解决的促进

为了避免多重变异样例学习和采用题海战术,并能促进规则样例学习的远迁移问题解决,开创出原样例学习后对原型规则做出变型推理的学习方法,以算术应用题的解题样例为原样例学习材料进行了4项实验研究。结果显示：四年级小学生运用该方法可有效促进远迁移问题的解决;其变型推理能力存在数学成绩等级差异;提供问题情境和推理提示能提高部分学生规则变型推理成绩和远迁移测验成绩。实验结果证明,规则变型推理是促进远迁移问题解决的有效方法之一。     

Subordinate swordtail males escalate faster than dominants: A failure of the social conditioning principle

In previous studies we have shown that subordinate swordtail males (Xiphophorus helleri) direct more bites to their mirror image than dominants and, in confrontations with strange dominant males, approach the opponent more often during the pre-escalation period of fights. Consequently, we predicted that fights between two omega-males should escalate faster than fights between two alpha-males. Indeed, in omega-omega fights preescalation periods were shorter and biting rates were higher than in alpha-alpha fights before the fights escalated from the first retaliation bite onward. Another new observation was that in omega-alpha confrontations the first bite in the pre-escalation period was executed more often by the omega-male and there was also a tendency to bite more compared to the alpha-male in that stage of the encounters. We conclude that sub-ordinate males escalate faster and fight more offensively prior to escalation than do dominant males. The results cannot be explained by the “social conditioning principle.” On the ultimate level moderate costs of losing and high benefits of winning a fight, constraints on continued growth after maturing, short life-expectancy, and habitat saturation are probably factors promoting the offensive tactics of subordinate males. © 1993 Wiley-Liss, Inc.