Henkin Quantifiers and the Definability of Truth

Henkin quantifiers have been introduced in Henkin (1961). Walkoe (1970) studied basic model-theoretical properties of an extension L _* ¹(H) of ordinary first-order languages in which every sentence is a first-order sentence prefixed with a Henkin quantifier. In this paper we consider a generalization of Walkoe's languages: we close L _* ¹(H) with respect to Boolean operations, and obtain the language L ¹(H). At the next level, we consider an extension L _* ²(H) of L ¹(H) in which every sentence is an L ¹(H)-sentence prefixed with a Henkin quantifier. We repeat this construction to infinity. Using the (un)-definability of truth – in – N for these languages, we show that this hierarchy does not collapse. In addition, we compare some of the present results to the ones obtained by Kripke (1975), McGee (1991), and Hintikka (1996).     

‚Was Ist Begründung?’ Schwierigkeiten durch den Primat der Pragmatik vor der Semantik am Beispiel des Erlanger/Konstanzer Konstruktivismus

‘What is justification?’-Constructivism of Erlangen/Constanceschool as an example for problems resulting from priority of pragmatics to semantics. - R. Brandom's ‘Making it explicit’ is an attempt to work out how semantics is rooted in pragmatics: meaning in use and conceptual content in social functional roles. A philosophy that also focuses on reconstructing those norms that are implicit in pragmatics and constitutive to semanticsis developed by Constructivism of Erlangen/Constance school. This enquiry tries to work out that a discussion of constructivism might be useful for a comprehension of Brandom's ‘theory of expression’, because both philosophical positions meet themselves in a pragmatic way of justification that makes it impossible to justify claims to all rational beings but only to members of those communities that share the same interests and institutions.     

反馈相关ERP成分的参照点效应

采用投注—反馈金钱赌博任务具体操作了在结果评价中被试可能采用的参照点,试图进一步探究大脑监控系统是如何对事件的好、坏以及好坏程度进行评定的。实验结果表明,不管是Feedback-related negativity (FRN)还是P300,和赌注相差较小的中间三种反馈诱发的波幅差异不显著,和赌注相差较大的两边两种反馈诱发的波幅和中间三种反馈差异显著。该结果说明,反馈相关ERP成分不是反映了对绝对信息的加工,而是反映了以赌注所在的区间为参照点的相对信息的加工。研究进一步从不同侧面表明FRN所代表的效价评价的参照点效应,同时首次从神经机制上揭示了P300所代表的数量加工的参照点效应     

Das prädiskursive Einverständnis. Wissenschaftlicher Wahrheitsbegriff und prozedurale Rechtfertigung

The pre-discoursive agreement. Theory of scientific truth and procedural justification. — On basis of the constructive philosophy of science, the attention is focussed to the pre-discoursive elements of discoursive theories of truth. By using a pragmatic approach it is shown that foundation of those pre-discoursive elements, like discourse rules or the basic terminology, is possible though the discourse rules are not available at this level. Propositions which can be shown in the presented theory to be true, always describe a know-how instead of a knowledge about the world. As a result, the relevance of the presented analysis for prototheories of scientific disciplines is investigated. This revised version was published online in August 2006 with corrections to the Cover Date.     

An analysis of daily report cards and parent-managed privileges in the improvement of adolescents' classroom performance

A daily report-card system, involving home privileges administered by parents, was developed for use with "problem" junior-high students. In Experiment I, when home privileges and parent praise were contingent on improved school conduct, classwork, daily grades, and teacher satisfaction, the school performance of three students improved considerably. In Experiment II, a similar report-card system was employed with two additional students, except only parent praise was contingent on improved school performance. Under these conditions, one of the students did not bring the report card home, and class performance did not improve until contingent home privileges were added. The school performance of the second student improved with the card and praise alone. However, there appeared to be a slow decline of classwork performance over time. For Experiment III, an instructional manual, describing the report-card program, was written for school guidance counsellors. Two guidance counsellors read the program, used it with one student each, and found that the school performance of both students improved. These results suggest that the daily report-card program with home consequences administered by parents can improve the school performance of, and teacher satisfaction about, students having considerable difficulty in school.     

Responses and pauses: discrimination and a choice catastrophe.

Pigeons produced a stimulus change either by responding or by not responding for a specified time period (by pausing). They then had to choose between two responses to obtain food. One choice was correct if the first component had been completed by a response; the other was correct if the component had been completed by a pause. The pigeons usually chose correctly, thereby indicating that they used their own prior behavior as a discriminative stimulus. Fixed pause requirements did not produce equal first component completions by a response and by a pause. To obtain equality, the pause requirement was titrated as a function of current performance. Titration resulted in equal completions and also produced accurate discrimination. In addition to showing that pigeons discriminated whether they had responded or paused, the data displayed and discontinuous functions predicted by catastrophe theory. Another procedure used forced choice rather than titration to produce equal completions by pausing and responding and also showed accurate discrimination of behavior.     

Equivalent models in covariance structure analysis

Defining equivalent models as those that reproduce the same set of covariance matrices, necessary and sufficient conditions are stated for the local equivalence of two expanded identified modelsM ₁ andM ₂ when fitting the more restricted modelM ₀. Assuming several regularity conditions, the rank deficiency of the Jacobian matrix, composed of derivatives of the covariance elements with respect to the union of the free parameters ofM ₁ andM ₂ (which characterizes modelM ₁₂), is a necessary and sufficient condition for the local equivalence ofM ₁ andM ₂. This condition is satisfied, in practice, when the analysis dealing with the fitting ofM ₀, predicts that the decreases in the chi-square goodness-of-fit statistic for the fitting ofM ₁ orM ₂, orM ₁₂ are all equal for any set of sample data, except on differences due to rounding errors.This research was supported by the Foundation of Social-Cultural Sciences which is subsidized by the Dutch Scientific Organization (N.W.O.) under project number 500-278-003. The author wishes to thank Anne Boomsma, Ivo Molenaar, Albert Satorra, and Tom Snijders for their stimulating and crucial comments during the research, and the Editor, Paul Bekker, Henk Broer, and anonymous reviewers for their helpful suggestions.     

Prospect Theory in Political Science: Gains and Losses From the First Decade

Prospect theory offers a number of advantages that justify its use in the analysis of political behavior, but it also has some aspects that limit its wider applicability in political contexts. This article reviews recent research highlighting these successes and limitations. Future research on the incorporation of prospect theory into models of political behavior should focus on such areas as group decision-making, reference point specification, and emotion.     

风险敏感理论:需要驱动风险决策

风险敏感理论由研究动物觅食行为发展而来,提出有机体在有需要的状况下会出现从风险规避到风险寻求的行为,是风险决策领域内的一种生物学理论。目前风险敏感理论所做出的预测在动物和人类身上都获得了大量实证研究的支持,表明该理论可以解释很多领域中的风险决策。因此有必要对这一理论做一个系统的论述,包括对其理论来源和数学模型的发展演变进行梳理;从参照点等不同的角度分析该理论与其他决策理论的区别;并且,风险敏感理论也为经济不平等和权力等外部因素下的风险转移提供了解释,对已有研究做出了独特的贡献。