Stepwise reductions in US density and intensity: Maintenance and extinction of conditioned suppression

Information was sought on how the strength of fear, acquired and extinguished in a classical conditioning paradigm, might be affected by certain of the circumstances that normally are associated with the course of avoidance learning. Following preconditioning exposures to the conditioned stimulus, one group of rats (Group PRF) was given continuous conditioned stimulus-unconditioned stimulus (CS-US) acquisition trials followed by stepwise reductions in US probability (given the CS) over three phases to about 11% for the final phase. Another group, Group US(lo), was given continuous CS-US pairings throughout, but, following acquisition, received stepwise reductions in US intensity (to permit evaluation of a progressively changing feature of the US over a wide range without having to employ excessive shock) over the same phases. A third group, Group US(hi), received unchanging (from acquisition) CS-US pairings over these phases, and an explicitly unpaired control group (Group RU) was included. Although outcomes differed somewhat depending upon whether suppression ratios or absolute measures of responding were considered, the major findings were that suppression to the CS was complete by the end of acquisition and persisted thereafter throughout the three phases for all but control subjects. In contrast to Group US(lo), which showed relatively little resistance to extinction of suppression to subsequent CS-only exposures, Groups US(hi) and PRF displayed marked resistance over two separate, extended sets of extinction sessions. Suppression to context cues was pronounced only for Groups US(hi) and RU, and varied as a function of US parameters and not whether the shocks were or were not signaled. Theoretical reconciliation of these findings was most difficult for Groun PRF.     

dMath: a European project for the restatement of mathematics teaching

In this article the main characteristics of the dMath project are introduced. With the mathematical modules developed within this project a new tool is made available to the different users as a support of the teaching and learning of mathematics in the context of EHEA and of the Bologna declaration.     

Finding the right problem

In an educational setting, a solution that has worked for one problem may not work for the same problem that occurs at a different time in a different work conditions. However, administrators and teachers resort to quick solutions to the perceived problem, consequently affecting not only the curriculum but also the students ’ learning. This paper shows how administrators and teachers can find problems prior to problem solution by taking three steps: (1) Examining the interconnectivity of things; (2) Exploring possible and alternative problems and (3) Asking the right question. The paper demonstrates not only how these steps operate in specific situations encountered by administrators and teachers but also how finding the problem can be an effective tool in performing their respective roles.     

Jean Baudrillard’s radical thinking,and its potential contribution to the sociology of higher education illustrated by debates about ‘World-Class’ universities

This article presents an argument for re-reading Jean Baudrillard’s ideas considering their potential contribution to the sociology of higher education, particularly in relation to contemporary debates about ‘world-class’ universities. In order to apply Baudrillard’s ideas, China’s commitment to the development of ‘world-class’ universities is presented as a case study. Radical thinking, as understood by Baudrillard, relies on ambivalence and fascination – instead of critique – and seeks to push a logic to its limits rather than opposing it. Critiques of world-class universities have not stopped the totalizing effects of rankings and world-class status seeking; on the contrary, these phenomena and their effects continue to accelerate. A non-deterministic approach to thinking is set into motion around the paroxystic state that prevails in the pursuit of ‘world-class’ status among contemporary higher education systems.     

The Intersectionality of Culturally Responsive Teaching and Performance Poetry: Validating Secondary Latino Youth and Their Community

In this article the authors draw from culturally responsive teaching and multicultural education to describe performance poetry as an effective strategy for validating secondary aged Latino youths’ lived experiences. Supported by teacher modeling and the incorporation of community poets, students created and shared their own powerful poems that provided authentic opportunities to engage in critical analysis of the poems and issues of equality, social justice, and equity. Performance poetry is successfully used as a tool for validation, honoring and learning from our community, and transformation. Students in this border community were validated in terms of the identities as members of multiple worlds, learned about their own neighborhood from community poets, and were transformed in their identities as community activists through performance poetry. However, in this era of standardized teaching and high-stakes testing, teaching through performance poetry is often not supported in schools.     

Going Against the Grain in an Urban Arizona High School: Secondary Preservice Teachers Emerging as Culturally Responsive Educators

This one year study examines the journey of two preservice urban high-school teachers in Arizona as they enact Culturally Responsive Teaching in a year-long student teaching residency. Factors that influenced their Culturally Responsive Teaching practices are discussed along themes that emerged from interviews and classroom observations. Recommendations for ways of integrating Culturally Responsive Teaching in teacher education programs are provided.     

Reading to write an argumentation: the role of epistemological,reading and writing beliefs

The general aim of this study was to examine the relations among epistemological, reading and writing beliefs held by psychology undergraduates and the role played by these three types of belief in influencing the degree of perspectivism manifested in a written argumentation task based on reading two texts presenting conflicting perspectives on the same topic. A total of 118 fourth‐year psychology students took part. Only 76 students performed the written argumentation task. The three types of belief were assessed using different questionnaires. The results show that the different types of belief do not occur in isolation, but have an internal coherence. They also indicate that only reading beliefs, together with the degree of perspectivism shown in a prior argumentation task, help to predict the degree of perspectivism in the written task following the reading of the texts.     

Opportunities to Learn and Achievement in Mathematics in a Sample of Sixth Grade Students in Lima, Peru

In recent years, the mathematics achievement of Peruvian students has been evaluated in three national and two international studies. The results in all cases suggest very poor learning. A similar situation is found in many developing countries. In this study, we analyzed the opportunities to learn (OTL) mathematics of sixth grade students from 22 public schools in Lima, Peru. OTL were defined in this study as curriculum coverage, cognitive demand of the tasks posed to the students, percent of mathematical exercises that were correct and quality of feedback. These variables were coded in the workbooks and notebooks of the students, which were gathered at the end of the school year (at the same time, the mathematics achievement test was administered). The results show that: (a) regarding OTL, less than half of the exercises available in the workbooks were solved, teachers overemphasize some topics of the national curriculum ({i.e.} related to Number and Number Sense), they pose tasks that are at very low levels of cognitive demand, and it is common to find mistakes in the students' answers to problems that have no feedback (or even worse, the feedback is wrong); (b) students in relatively poorer, multigrade classrooms have less OTL; (c) OTL, as defined earlier, is positively associated with achievement.A preliminary version of this paper received the Research Medal in the category Knowledge, Education andTechnology at the Annual Meeting of the Global Development Network (GDN) in Cairo, in January 2003.     

Exploring the nature of associations between educators’ knowledge and their emergent literacy classroom practices

Reading and Writing - Educators’ content knowledge is considered a key determinant of classroom practices and thus children’s learning. In this study, we examine the nature of...     

Flavor preferences conditioned with starch in rats

Rats were trained to associate artificial cherry or grape flavors with 1% starch suspensions. Conditioning was assessed by offering the rats a choice of the cherry versus grape flavors without starch. Conditioned preferences were moderately strong and persistent; 3 days of conditioning produced a preference that did not fully extinguish within 18 days. Food deprivation substantially increased intake of 1% starch suspension, However, the degree of preference conditioned was not influenced by the availability of food during the conditioning period; the rats that had been food deprived during training acquired as strong a preference as did those fed freely during training. The degree of preference obtained was similar in the rats given reinforcing and nonreinforcing fluids simultaneously or sequentially. Starch conditioned a slightly stronger preference than did the same concentration of glucose, even though these substances contain the same amount of calories. A statistically significant, but weak, preference was conditioned by 0.5%, but not by 0.25%, starch. It is proposed that the flavor of starch, independent of its calories, is reinforcing to rats.