The effect of number and minimum duration of post-response-prevention escapes on the resistance to extinction of an avoidance response

After one-way avoidance training, rats were exposed, during avoidance response prevention, to light (CS-only) presentations or to light-shock (CS-US) pairings. Subgroups were then given 1, 5, or 10 trials during which they could escape immediately (unrestricted) or after 5 sec (restricted) by means of the previously conditioned avoidance response from a simultaneous light-shock compound. All animals were then exposed to avoidance extinction. The number of unrestricted escapes increased responding for CS-only animals, but had no significant effect on the performance of CS-US animals. Nevertheless, resistance to extinction was considerably less for CS-only animals given 10 unrestricted escapes than for CS-US animals given one unrestricted escape. One restricted escape had no more effect than one unrestricted escape for either response-prevention group. However, 5 restricted escapes elevated responding for CS-only animals to the level of CS-US animals. Extinction responding for CS-US animals increased significantly only after 10 restricted escapes. Since CS-only animals showed no further increase, resistance to extinction once more was greater for CS-US animals. These results, together with the very brief unrestricted escape latencies of CS-only animals, support a greater role for Pavlovian extinction than for response competition in the facilitation of avoidance extinction by CS-only response prevention. The fact that 10 restricted escapes were required to elevate resistance to extinction for CS-US animals over that obtained with one unrestricted escape attests to the effectiveness of Pavlovian conditioning during avoidance response prevention in elevating CS aversiveness to a near ceiling level.     

The making of personal meaning: Some thoughts for teacher educators

Much of the focus in schools today is on teaching critical thinking skills. This article challenges the current practice of teaching thinking as a set of skills and procedures. We propose a more thoughtful way of encouraging learners to make personal meaning of what they are learning by searching for insight, making connections between their past and present learning experiences, and using reflection as a tool for gaining understanding, all of which we do quite naturally.This article focusses on the experience of one post-secondary teacher as she attempts to take a more thoughtful approach to her practice with a class of student teachers. Specific ideas for assisting students in using reflection as a learning tool for furthering understanding and for promoting thoughtfulness are provided.     

Emotionality related to maternal cannibalism in BALB and C57BL mice

Twenty-four female mice from two inbred strains, BALB and C57BL, were tested for emotional behavior. Half of the animals had successfully raised their first litter to weaning, while the other half had eaten their first litter. Cannibalistic females of both strains were found to be more prone to auditory stress than controls. However, the relationship between emotional defecation and cannibalism was found to interact with strain, suggesting an optimum level of arousal.     

A constructivist approach to secondary school science experiments

The focus of this study was on the investigation of a laboratory instructional program on electricity designed for conceptual development using constructivist principles for conceptual change. This approach was compared with a traditional laboratory approach in a quasi-experimental design. The sample was 247 grade 10 students (boys) in a large non-government urban school. Covariance analysis with the corresponding pretest as covariate showed statistically and educationally significant gains for the experimental group on cognitive but not attitudinal outcomes when compared to the traditional group. Student and teacher interview data provide some evidence for the success of the experimental approach. Specializations: physics education, constructivist approaches to in practical work. Specializations: science teacher education, learning environments, conceptual change.     

Mitigating Colorblind Racism in the Postnetwork Era: Class-Inflected Masculinities in The Shield,Sons of Anarchy,and Justified

This analysis explores the relation between class-stratified White masculinities and moral ambiguity in FX crime drama. Conflicts between morally ambiguous White men in The Shield (2002–2008), Sons of Anarchy (2008–present), and Justified (2010–present) support colorblind racial ideology by positioning a central antiheroic protagonist in opposition to overtly racist characters who embody stereotypes associated with the White underclass. In comparison with traditional crime dramas, these juxtapositions provide realistic depictions of contemporary America by acknowledging the existence of racial prejudice while the antihero’s ultimate victory stands as a rejection of anachronistic racial sensibilities drawing attention away from issues related to systemic inequality.     

批判教育学中的政治、理论与现实(下)

编者按:究竟如何理解英美的批判教育学思潮,尤其是近年来其阵营内部存在纷纷攘攘、似大有碎片化的趋势,本刊特约请当代批判教育学的代表人物之一,世界知名学者、教育思想家阿普尔教授,加州州立大学助理教授韦恩·欧,对批判教育学的历史、目前内部不同取向间的分歧以及在当代保守主义复兴语境中所面临的挑战和应对策略,予以全面的梳理和分析.批判教育学对于中国教育学界并不陌生,但是,对于它的历史缘起、理论全貌和时代境遇,我们少有系统和整体的关注.本文之于我们的价值不仅在于可略补此憾,更重要的是,它会启发我们反思,在中国时下教育改革的潮流中,我们的教育、政治、文化和经济内涵是什么?教育在社会的现实变革、社会的发展远景中,究竟应该扮演什么角色?因本文篇幅较长,故分上篇、下篇两次刊发,敬请读者谅解.     

Infusing two models of evaluation into a military environment: A case study

Determining the worth and effectiveness of training used within a military environment is the same accountability responsibility that educational organizations, businesses, and social agencies are charged with for improving programs and services to society. The need for accountability implies the process of evaluation, particularly in governmental training programs. This article provides a case study, blueprint, and action plan for the infusion of two evaluation models as the foundation for determining the effectiveness of training within a military application.