不确定性风险选择的抱负水平—相对效用整合理论

本文认为不确定性风险决策备择方案的选择标准既不是规范效用理论所主张的效用最大化,也不只是研究者们基于西蒙有限理性决策理论而提出的抱负水平,而是存在于决策不同阶段上的、由启发式策略控制着的这两种标准的整合,我们称之为抱负水平－相对效用整合标准。为此,我们在研究抱负水平结构的基础上提出了负险选择的抱负水平－相对效用整合理论及其支持性研究证据,并就有关问题进行了讨论与思考。指出抱负水平－相对效用整合是风     

Local homogeneity in latent trait models. A characterization of the homogeneous monotone irt model

The stochastic subject formulation of latent trait models contends that, within a given subject, the event of obtaining a certain response pattern may be probabilistic. Ordinary latent trait models do not imply that these within-subject probabilities are identical to the conditional probabilities specified by the model. The latter condition is called local homogeneity. It is shown that local homgeneity is equivalent to subpopulation invariance of the model. In case of the monotone IRT model, local homogeneity implies absence of item bias, absence of item specific traits, and the possibility to join overlapping subtests. The following characterization theorem is proved: the homogeneous monotone IRT model holds for a finite or countable item pool if and only if the pool is experimentally independent and pairwise nonnegative association holds in every positive subpopulation.This research was supported by the Dutch Interuniversity Graduate School of Psychometrics and Sociometrics. The authors wish to thank two reviewers for their thorough comments.     

Replacing relative reinforcing efficacy with behavioral economic demand curves

Relative reinforcing efficacy refers to the behavior-strengthening or maintaining property of a reinforcer when compared to that of another reinforcer. Traditional measures of relative reinforcing efficacy sometimes have led to discordant results across and within studies. By contrast, previous investigations have found traditional measures to be congruent with behavioral economic measures, which provide a framework for integrating the discordant results. This study tested whether the previously demonstrated congruence between traditional relative reinforcing efficacy measures and behavioral economic demand curve measures is sufficiently robust to persist when demand for one reinforcer is altered. Cigarette smokers pulled plungers for cigarettes or two magnitudes of money on progressive-ratio schedules that increased the response requirement across sessions. Demand for the two different reinforcers was assessed in single-schedule and concurrent-schedule sessions. Demand curve measures Pmax and Omax correlated significantly with traditional measures of breakpoint and peak response rate, respectively. Relative locations of demand curves for money and cigarettes under single schedules predicted preference in concurrent schedules in most cases. Although measures of relative reinforcing efficacy for money changed with money magnitude, the congruence between traditional and behavioral economic measures remained intact. This robust congruence supports the proposal that demand curves should replace measures of relative reinforcing efficacy. The demand curve analysis illustrates why concordance between traditional measures is expected under some experimental conditions but not others.     

Empathy and viewing the other as a subject

Empathy and viewing another person as a subject rather than an object are often associated in theoretical contexts, but empirical research of the relation is scarce. The purpose of the present research was to investigate the relationship between subject/object view and empathy. In Study 1, participants watched film clips and indicated their empathy for specific characters in the clips, as well as the extent to which they saw these persons as subjects and objects. The subject/object view explained some, but not all, of the differences in empathy, which raised the question of what else accounts for differences in empathy. A second study was conducted to investigate whether the difficulty of the other's situation also contributes. In Study 2, another group watched the film clips and rated the difficulty of the film character's situations in addition to empathy and subject/object view. The results of Study 2 revealed that subject view/object and perceived difficulty together explain a substantial part of differences in empathy. It was concluded that empathy is evoked primarily when a person in difficulty is viewed as a subject.     

Comprehension of reversible relative clauses in specifically language impaired and normally developing Greek children

This paper aims to investigate the syntactic comprehension of reversible relative clauses in a group of eight Greek children with specific language impairment (SLI) and two control groups of normally developing children matched on chronological and language age, respectively. An experiment using an acting out procedure was undertaken. Group analysis revealed that SLI children's performance is qualitatively different than that of both control groups. Interpreting the data, processes involved in syntactic comprehension are taken into consideration. It is claimed that processing demands impede SLI children's performance due to a deficit in their competence grammar.     

医疗保障制度改革过程中的价值取向问题及其影响

随着社会主义市场经济体制的建立,我国传统的劳保医疗制度和公费医疗制度已越来越不适应社会发展的要求,呈现出诸多弊端,亟待改革。作为一项公共政策,医疗保障制度在改革与完善的过程中应根据科学行政的要求对政策的价值取向进行深入分析,以便顺利实施改革的各项方案。分析医疗保障制度改革中所涉及的各方面的价值观及其对改革的影响,希望唤起政策制定者对不同群体利益的关注,从而保证政策体系的稳定。     

Response rate viewed as engagement bouts: effects of relative reinforcement and schedule type.

The rate of a reinforced response is conceptualized as a composite of engagement bouts (visits) and responding during visits. Part I of this paper describes a method for estimating the rate of visit initiations and the average number of responses per visit from log survivor plots: the proportion) of interresponse times (IRTs) longer than some elapsed time (log scale) plotted as a function of elapsed time. In Part 2 the method is applied to IRT distributions from rats that obtained food pellets by nose poking a lighted key under various multiple schedules of reinforcement. As expected, total response rate increased as a function of (a) increasing the rate of reinforcement (i.e., variable-interval [VI] 4 min vs. VI 1 mi), (b) increasing the amount of the reinforcer (one food pellet vs. four pellets), (c) increasing the percentage of reinforcers that were contingent on nose poking (25% vs. 100%), and (d) requiring additional responses after the end of the VI schedule (i.e., adding a tandem variable-ratio [VR] 9 requirement). The first three of these variables (relative reinforcement) increased the visit-initiation rate. The tandem VR, in contrast, increased the number of responses per visit. Thus, variables that have similar effects on total response rate can be differentiated based on their effects on the componemts of response rate.     

无语境条件下汉语词类歧义词的意义激活

以单字词为实验材料,采用启动命名任务,在孤立词条件下考察了汉语词类歧义词不同意义激活的时间进程特点。实验发现,歧义词的两种意义都能被激活,但主要意义激活得较早,次要意义激活速度较慢;当两种意义都激活之后,次要意义的激活水平降低,而主要意义仍维持在一定激活水平。结果表明,汉语词类歧义词的多重激活过程会受到意义相对频率的影响。     

Policy, Principle, and Incrementalism: Dworkin's Jurisprudence of Race

For several decades, Ronald Dworkinhas been one of the most prominent voicesdefending the legality and justifiability ofrace-conscious programs aimed at undoing thecontinuing effects of prejudice. Writingwithin the framework of a liberal legalphilosophy, he has formulated powerfularguments against the view that color-blindpolicies are the only defensible ones. Nonetheless, I argue that a more completeliberal defense of race-conscious policieswould need to develop and modify Dworkin's lineof argument. Such a defense would go beyondhis policy-based arguments and incorporatearguments of principle. Race-conscious policiesdo not only promote the general good; they arealso required in order to help realize theconstitutional right of equal citizenship.     

Happiness Trends Under Democracy: Where Will the New South African

Five years after South Africa's first democratic elections in 1994, life satisfaction and happiness still reflect societal divides sowed by apartheid social engineering. The paper reports the indicators: life satisfaction, happiness and expectations for the future, from national surveys conducted between 1983 and 1999 for the South African Quality-of-Life Trends Project. Post-election euphoria, which saw all South Africans happy and satisfied with life for a brief moment in 1994, raises the question where the new set-level of subjective well-being will eventually come to rest. In 1999, in spite of some gains in living conditions, the level of life satisfaction of blacks has not risen above the mid-point and happiness is only slightly above the mid-point. Meanwhile, whites, who have forfeited their political dominance, continue to score above the mid-point on happiness and life satisfaction. The paper draws on the literature, particularly on quality-of-life trends in reunified Germany and paradoxical trends in African-American life satisfaction when discussing the dynamics underlying South African subjective well-being. It is argued that coping mechanisms may play an important role in determining levels of subjective well-being in the complex situation of South Africa.