Behavioral contrast and reinforcement value

Behavioral contrast was produced in two target components of a four-component multiple schedule by having two target stimuli followed either by a higher rate of reinforcement or by extinction. Response rate was higher in the target followed by extinction. Periodic probe trials were then presented in which the two target stimuli were presented together. Choice on these probe trials was in favor of the stimulus followed by the higher rate of reinforcement during regular training. Experiment 2 replicated this finding but with probe trials presented throughout training. Here, preference for the stimulus followed by the higher rate of reinforcement was evident early in training, substantially before the contrast effects developed. The results challenge interpretations of contrast based on the concept of relative value.     

Deprivation level and choice in pigeons: a test of within-trial contrast

Within-trial contrast has been proposed as a mechanism underlying preferences for stimuli that follow relatively more aversive events over stimuli that follow less aversive events. In this study, we manipulated deprivation level to test within-trial contrast predictions. In Experiment 1, pigeons encountered two discriminative stimuli, one presented when they were deprived and the other when they were prefed. When later given a choice between the two stimuli, pigeons strongly preferred the stimulus encountered when deprived, independently of their deprivation level at test. In Experiment 2, pigeons learned two simultaneous discriminations, one when deprived and the other when prefed. Here, subsequent tests between the two S⁺ or the two S⁻ stimuli revealed no consistent preferences. These contrasting findings suggest that differential aversiveness is necessary but not sufficient to induce preferences via within-trial contrast.     

Behavioral contrast and inhibitory stimulus control

Two experiments examined the presumed relationship between behavioral contrast and inhibitory stimulus control. In Experiment I, pigeons were exposed to mult VI 1-min VI 1-min or mult VI 5-min VI 5-min during baseline training prior to mult VI 1-min VI 5-min discrimination training. Half of the subjects received a timeout (TO) component during baseline in order to reduce the degree of contrast during discrimination training. Only 3 of 8 subjects receiving the TO showed contrast while all other subjects showed various degrees of contrast. Postdiscrimination generalization gradients indicated excitatory rather than inhibitory control by the stimulus associated with the VI 5-min schedule. During baseline training in Experiment II, responding to all the generalization stimuli was reinforced. In addition, some subjects received the TO stimulus. The subjects were next exposed to mult VI 1-min EXT, mult VI 1-min VI 5-min, or just the VI 5-min component. Generalization gradients indicated inhibitory control by the stimulus associated with EXT or VI 5-min for 19 of 20 subjects even though some subjects did not show contrast. These results question the presumed relationship between behavioral contrast and inhibitory stimulus control.     

Determinants of value transfer and contrast in simultaneous discriminations by pigeons

In a simultaneous discrimination involving a positive (S+) and a negative (S₋) stimulus, positive value appears to transfer from the S+ to the S₋. However, negative value does not appear to transfer from the S₋ to the S+. Instead, when sufficient experience with the contingencies associated with responding to the S₋ is provided, it appears that the presence of the S₋ enhances the value of the S+ (i.e., a contrast effect is found). The purpose of the present experiments was to further examine the influence of the S+ on the S₋ in a simultaneous discrimination (between subjects in Experiment 1 and within subjects in Experiment 2). In both experiments, we found that under typical training conditions, given little direct experience with the value of the S₋, value transfers from the S+ to the S₋. If sufficient experience with the value of the S₋ is provided, however, contrast between the S+ and the S₋ can be demonstrated. Thus, in a simultaneous discrimination, value transfer from the S+ to the S₋ depends on the animal’s having responded relatively little to the S₋.     

Why educational reforms fail: A comparative analysis

The paper reviews a number of educational policy statements of East African countries ranging from combining education with production at the primary level, to the financing of higher education. An assessment is made of how successful the policies have been in achieving their original intention. The paper's conclusion is that policy outcomes are far from matching expectations, mainly because of insufficient or no implementation. The reason most educational policies are not implemented is that they are vaguely stated and the financing implications are not always worked out. Another reason for failure is that the content of a policy is based on an empirically unsustained theoretical relationship between instruments and outcomes. The paper makes a plea for the formulation of more concrete, feasible and implementable policies based on documented cause-effect relationships.

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Zusammenfassung In dem Artikel werden eine Reihe von erziehungspolitischen Aussagen ostafrikanischer Länder untersucht. Sie reichen von der Verbindung der Erziehung mit der Produktion auf der Grundstufe bis hin zur Finanzierung der Hochschulausbildung. Es wird eine Bestandsaufnahme gemacht hinsichtlich des Erfolgs, der den erziehungspolitischen Programmen beim Erreichen ihrer ursprünglichen Ziele beschieden war, wobei man zu dem Schluß kommt, daß die Resultate der Programme hauptsächlich dadurch, daß diese nicht oder nur unzureichend durchgeführt wurden, weit davon entfernt sind, die Erwartungen zu erfüllen. Der Grund dafür, daß die meisten erziehungspolitischen Programme nicht durchgeführt werden, liegt darin, daß sie nur vage umrissen und die finanziellen Auswirkungen nicht immer ausgearbeitet sind. Ein weiterer Grund für ihr Fehlschlagen liegt darin, daß der Inhalt eines Programms auf einer empirisch unhaltbaren theoretischen Beziehung zwischen Mitteln und Resultaten basiert. In dem Artikel wird daher für die Formulierung konkreterer, geeigneterer und durchführbarerer Programme plädiert, die auf bereits belegten Beziehungen von Ursache und Wirkung beruhen.

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Résumé Le présent article examine quelques déclarations de pays de l'Afrique orientale relatives à la politique éducative, allant d'un système combiné d'éducation et de travail productif dans l'enseignement primaire, au financement de l'enseignement supérieur. Une analyse est effectuée pour savoir combien ces politiques ont réussi à mettre en oeuvre leur objectif premier. Cet article conclut que les résultats de ces politiques sont loin de répondre aux exigences, en raison essentiellement d'une mise en oeuvre insuffisante, voire nulle. La raison pour laquelle la plupart des politiques éducatives ne sont pas appliquées est due au fait qu'elles sont vaguement formulées et les implications financières rarement élaborées. La seconde raison de cet échec est que le contenu d'une politique se fonde sur une relation théorique entre instruments et résultats qui n'a pas été vérifiée empiriquement. Cet article plaide en faveur de politiques concrètes, réalisables et applicables fondées sur un rapport de cause à effet bien documenté.

     

Sociological analysis and comparative education: A brief bibliographical background

The bibliography cites English language material at the intersection of two fields of study: sociology of education and comparative education. The collection of material is biased (a) toward the general reader rather than the specialist already working in the area, and (b) toward the identification of overlap between the two fields of study.

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Zusammenfassung Diese Bibliographie umfaßt englischsprachiges Material am Schnittpunkt von zwei Studienfeldern: der Erziehungssoziologie und der Vergleichenden Erziehungswissenschaft. Das gesammelte Material ist (a) mehr auf den allgemeinen Leser als auf bereits in diesem Bereich tätige Wissenschaftler ausgerichtet, und (b) bezieht sich vorzugsweise auf die Feststellung von Überschneidungen zwischen den beiden Studiengebieten.

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Résumé La bibliographie cite le matériel en langue anglaise à l'intersection de deux domaines d'étude: la sociologie de l'éducation et l'éducation comparée. Le matériel rassemblé s'adresse davantage au lecteur ordinaire qu'au spécialiste travaillant déjà dans ce domaine et vise surtout l'identification de la partie commune aux deux champs d'étude.

     

Teacher labour markets in South Africa and Botswana: A comparative analysis

This article compares key features of the labour markets for teachers across Botswana and South Africa in order to seek possible explanations for the apparently larger teacher shortages in South Africa. It is argued that South African teachers earn relatively lower wages when compared to professionals with comparable qualifications; they have also been subject to a more haphazard series of reforms in teacher training, and are the product of a teaching culture shaped heavily by powerful trade unions. The impact of these factors on both the quantity and quality of teachers is considered.     

Spatial memory and the performance of rats and pigeons in the radial-arm maze

The resource-distribution hypothesis states that the ability of an animal to remember the spatial location of past events is related to the typical distribution of food resources for the species. It appears to predict that Norway rats would perform better than domestic pigeons in tasks requiring spatial event memory. Pigeons, tested in an eight-arm radial maze, exhibited no more than half of the memory capacity observed in rats in the same apparatus and may not have used spatial memory at all. The results were interpreted as supporting the hypothesis.     

英汉语篇关联词对比研究

本文通过分析两者语言的特点,对比研究了英汉篇章中关联词的异同,旨在有助于外语教学中了解其相同及相异处,能够在关联词习得过程中有效利用其相同处,注意区分相异处,减少母语负迁移的产生。     

中德学前教育比较分析

对中德学前教育机构设置、课程设置、教学组织形式及学前学校教育与家庭教育的关系这四个方面进行比较的基础上,分析了造成中德学前教育差异的原因,结合德国学前教育的优点,对我国学前教育提出四条建议,以期为我国当前学前教育改革提供有益借鉴。     

A comparative analysis of cognitive profiles: Monozygotic and dizygotic reading-disabled twins

Previous twin studies have provided evidence for genetic influences on reading disability (RD) or normal reading ability. The existence of subtypes of RD — each with its characteristic cognitive profile — has been suggested. Whether the etiology of the particular subtypes is genetic is uncertain. The present study examined within-pair comparisons of cognitive profiles (with respect to composites of general reading, symbol processing speed and sequential memory) in RD and control twins. Twin profile analysis were applied to these cognitive composites on 120 pairs of RD and control twins. Results showed a greater monozygotic (MZ) than dizygotic (DZ) resemblance in profiles indicating that individual differences in the patterning of cognitive abilities related to reading are genetically influenced.     

Student evaluation of teaching in the virtual and traditional classrooms: A comparative analysis

The present case study consists of the content analysis of anonymous student responses to open-ended evaluation of teaching questions submitted by 202 students for fully online and on-campus versions of the same graduate courses taught by the same professors over four academic years. Online courses received both more praise and more negative comments than did equivalent on-campus courses. The net result was a more negative rating for online courses. Findings suggest that the online course delivery medium introduced misalignment for some students between their preferred learning environment and the actual learning environment, notwithstanding student self-selection of the course delivery medium.     

Sociology and comparative education: A comparative educationist's perspective

The thesis examined in this paper is that comparative educationists, far from following intellectual trends, have introduced new dimensions to methods of enquiry developed first by historians, then by social scientists and, finally and perhaps marginally, by conceptual philosophers. In so far as comparisons can be made, it is asserted that, in the twentieth century, paradigms in comparative education reflect revolutions in the natural sciences, and that to the extent that these preceded shifts in social science paradigms after about 1900, comparative educationists debated and rejected positivism before sociologists did, in the Anglo-Saxon world at least.A second assumption which is examined is that comparative educationists have anticipated issues which subsequently became important in the growth of national and parochial research in sociology, and for that matter in political science.A disclaimer is necessary: little attempt has been made to examine the causal influences in either field or between comparative educationists and sociologists. The history of such interaction at a personal and institutional level is very recent, the participants in the interchanges are, in many cases, still alive, and a substantive recent history of comparative education has yet to be written, although to some extent E. Shils' analysis of the history of sociological enquiry provides a schema against which the growth of comparative education can be compared.

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Zusammenfassung In dieser Arbeit wird die These überprüft, daß vergleichende Erziehungswissenschaftler, weit davon entfernt, intellektuellen Trends zu folgen, neue Dimensionen für Untersuchungsmethoden eingeführt haben, die zuerst von Historikern, dann von Sozialwissenschaftlern und am Rande auch von konzeptuellen Philosophen entwickelt wurden. Soweit es möglich ist, Vergleiche anzustellen, wird dargelegt, daß im 20. Jahrhundert Paradigmen der vergleichenden Erziehungswissenschaft tiefgreifene Veränderungen in den Naturwissenschaften widerspiegeln. Softern diese den nach ca. 1900 stattfindenden Wandlungen in sozialwissenschaftlichen Paradigmen vorausgingen, haben vergleichende Erziehungswissenschaftler noch vor den Soziologen den Positivismus erörtert und verworfen, zumindest in der angelsächsischen Welt.Zweitens wird die Annahme überprüft, daß vergleichende Erziehungswissenschaftler Fragen vorweggenommen haben, die später in der Entwicklung nationaler und örtlicher soziologischer Forschung und auch in der Politologie Bedeutung erlangten.Eine Einschränkung muß noch gemacht werden: Der Autor hat weitgehend darauf verzichtet, die kausalen Einflüsse in den beiden Einzelbereichen sowie die gegenseitigen Einwirkungen von vergleichenden Erziehungswissenschaftlern und Soziologen zu untersuchen. Die Geschichte solcher Wechselwirkungen auf persönlicher und institutioneller Ebene ist noch sehr jung, die Teilnehmer an ihnen sind in vielen Fällen noch am Leben, und eine substantielle neuere Geschichte der vergleichenden Erziehungswissenschaft ist noch nicht geschrieben. Dennoch bietet E. Shils Analyse der Geschichte soziologischer Untersuchungen eine gewisse Grundlage für einen Vergleich mit der Entwicklung der vergleichenden Erziehungswissenschaft.

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Résumé La thèse soutenue dans cet article est que les théoriciens de l'éducation comparée, loin de suivre les courants intellectuels, ont introduit de nouvelles dimensions dans les méthodes d'enquête élaborées d'abord par les historiens, puis développées par les spécialistes des sciences sociales, et enfin — marginalement peut-être — par les philosophes conceptuels. Pour autant que l'on puisse établir des comparaisons, on constate qu'au XXe siècle, les paradigmes de l'éducation comparée reflètent les révolutions qui surviennent dans les sciences naturelles et qu'ils se modifient avant même ceux des sciences sociales, aux alentours de 1900, au point que les théoriciens de l'éducation comparée contestent et rejettent le positivisme avant que les spécialistes des sciences sociales soient parvenus à cette démarche, du moins dans les pays anglosaxons.Une autre assomption de la thèse est que les théoriciens de l'éducation comparée ont anticipé des situations qui devaient se révéler importantes par la suite, avec le développement de la recherche sociologique nationale et locale, et également avec celui des sciences politiques.Il est juste de reconnaître néanmoins qu'une timide tentative a été faite dans l'intention d'étudier les influences causales, que ce soit dans chacun de ces domaines ou entre théoriciens de l'éducation comparée et sociologues. L'histoire d'une telle interaction au niveau individuel et au niveau institutionnel est très récente; les hommes qui ont participé à ces échanges sont encore pour la plupart vivants et une histoire récente autonome de l'éducation comparée reste à écrire. Toutefois, l'analyse que E. Shils a fate de l'histoire de l'enquête sociologique fournit, jusqu'à un certain point, une base permettant d'évaluer le développement de l'éducation comparée.

     

Inter- and intra-gender differences in life orientations and work attitudes in Israel: A comparative analysis

The article examines intergender and intragender differences in life orientations and attitudes toward work among Israeli students. Data were obtained from 428 respondents in the faculties of engineering and social sciences (psychology and social work) at four universities. Few attitudinal differences were found between the sexes. However, significant intra-gender differences were found, especially between men in gender-typical and atypical careers. In contrast to their \"gender-typical\" counterparts, the \"gender-atypical\" men emphasized more traditionally \"masculine\" orientations such as competitiveness, achievement, independence and control, political activity, and job success. Compared with these groups, the intra-gender differences between the \"gender-typical\" and \"gender atypical\" women were less significant.     

The neuroscience of perceptual categorization in pigeons: A mechanistic hypothesis

We are surrounded by an endless variation of objects. The ability to categorize these objects represents a core cognitive competence of humans and possibly all vertebrates. Research on category learning in nonhuman animals started with the seminal studies of Richard Herrnstein on the category “human” in pigeons. Since then, we have learned that pigeons are able to categorize a large number of stimulus sets, ranging from Cubist paintings to English orthography. Strangely, this prolific field has largely neglected to also study the avian neurobiology of categorization. Here, we present a hypothesis that combines experimental results and theories from categorization research in pigeons with neurobiological insights on visual processing and dopamine-mediated learning in primates. We conclude that in both fields, similar conclusions on the mechanisms of perceptual categorization have been drawn, despite very little cross-reference or communication between these two areas to date. We hypothesize that perceptual categorization is a two-component process in which stimulus features are first rapidly extracted in a feed-forward process, thereby enabling a fast subdivision along multiple category borders. In primates this seems to happen in the inferotemporal cortex, while pigeons may primarily use a cluster of associative visual forebrain areas. The second process rests on dopaminergic error-prediction learning that enables prefrontal areas to connect top down the relevant visual category dimension to the appropriate action dimension.     

A comparative analysis of multi-output frontier models

Recently, there have been more debates on the methods of measuring efficiency. The main objective of this paper is to make a sensitivity analysis for different frontier models and compare the results obtained from the different methods of estimating multi-output frontier for a specific application. The methods include stochastic distance function frontier, stochastic ray frontier, and data envelopment analysis. The stochastic frontier regressions with and without the inefficiency effects model are also compared and tested. The results indicate that there are significant correlations between the results obtained from the alternative estimation methods.