Exploring social constructivism: theories and practicalities

In the drive to improve standards, the collection and dissemination of numerical data still directs much contemporary educational policy. However, recent publications and debates seemingly attempt to reorient discussion from performance to learning. In support, constructivism is often referenced as a contributor in this endeavour. However, constructivism is not a single unified theory either of knowledge or pedagogy. This article identifies one version of constructivist thinking, social constructivism, both in terms of its underlying epistemology (theory of knowledge) and related pedagogy. Contemporary educational theories are then outlined to demonstrate that many practical solutions and theoretical ideas now presented as ‘good learning and teaching’ have much in common with social constructivist thinking. Finally, the article concludes by identifying two issues that require further discussion and debate if pedagogy of a social constructivist nature is to be considered.     

Development and Validation of Instruments to Measure Learning of Expert‐Like Thinking

This paper describes the process for creating and validating an assessment test that measures the effectiveness of instruction by probing how well that instruction causes students in a class to think like experts about specific areas of science. The design principles and process are laid out and it is shown how these align with professional standards that have been established for educational and psychological testing and the elements of assessment called for in a recent National Research Council study on assessment. The importance of student interviews for creating and validating the test is emphasized, and the appropriate interview procedures are presented. The relevance and use of standard psychometric statistical tests are discussed. Additionally, techniques for effective test administration are presented.     

Interviewing objects: including educational technologies as qualitative research participants

This article argues the importance of including significant technologies‐in‐use as key qualitative research participants when studying today’s digitally enhanced learning environments. We gather a set of eight heuristics to assist qualitative researchers in ‘interviewing’ technologies‐in‐use (or other relevant objects), drawing on concrete examples from our own qualitative research projects. Our discussion is informed by Actor‐Network Theory and hermeneutic phenomenology, as well as by the literatures of techno‐science, media ecology, and the philosophy of technology.     

Review Essay: Cultivating a Rhetoric of Agrarianism

CONTROL AND CONSOLATION IN AMERICAN CULTURE AND POLITICS: RHETORICS OF THERAPY. By Dana Cloud. Thousand Oaks: Sage Publications, 1998; pp. 224. Cloth $67.95; Paper $31.95.

DANGEROUS LIAISONS: GENDER, NATION, AND POSTCOLONIAL PERSPECTIVES. By Anne McClintock, Aamir Mufti, and Ella Shohat. Minneapolis and London: University of Minnesota Press, 1997; pp. 560. Cloth $62.95; Paper $24.95.

WHITENESS: THE COMMUNICATION OF SOCIAL IDENTITY. Edited by Thomas Nakayama and Judith Martin. Thousand Oaks: Sage Publications, 1999; pp. xiv + 314. Cloth $73.95; Paper $36.95.     

Frequency sweep rate dependence on the dielectrophoretic response of polystyrene beads and red blood cells

Alternating current (AC) dielectrophoresis (DEP) experiments for biological particles in microdevices are typically done at a fixed frequency. Reconstructing the DEP response curve from static frequency experiments is laborious, but essential to ascertain differences in dielectric properties of biological particles. Our lab explored the concept of sweeping the frequency as a function of time to rapidly determine the DEP response curve from fewer experiments. For the purpose of determining an ideal sweep rate, homogeneous 6.08 μm polystyrene (PS) beads were used as a model system. Translatability of the sweep rate approach to ∼7 μm red blood cells (RBC) was then verified. An Au/Ti quadrapole electrode microfluidic device was used to separately subject particles and cells to 10Vpp AC electric fields at frequencies ranging from 0.010 to 2.0 MHz over sweep rates from 0.00080 to 0.17 MHz/s. PS beads exhibited negative DEP assembly over the frequencies explored due to Maxwell-Wagner interfacial polarizations. Results demonstrate that frequency sweep rates must be slower than particle polarization timescales to achieve reliable incremental polarizations; sweep rates near 0.00080 MHz/s yielded DEP behaviors very consistent with static frequency DEP responses for both PS beads and RBCs.     

A Game for Christmas? The Argylls,Saxons and Football on the Western Front,December 1914

Historians know that any mention of football and World War I will involve discussions of the Christmas truces of 1914 and the mythical football match between British and German troops. Many British soldiers denied that any truce had occurred let alone a football match. However, while there is indisputable evidence of truces, triangulating proof of football has been elusive. In this paper, a case study of the British 2/Argylls and the German 133/Saxons is developed. The underlying reasons behind the truce are discussed and why some combatants, in the short break from trying to kill each other, probably played football, even though certainly not as the formal match of popular imagination. It is argued that the truce was a result of unique circumstances and was not an overwhelmingly inspirational moment for the majority of troops involved; they all returned to the fighting. Most participants on both sides of the truce probably regarded it as an unexpected holiday and some availed themselves of the opportunity to play their favourite game. The paper concludes by examining recent commemorative events of Christmas 1914 and how they may have contributed to the myth of ‘The Football Match’.     

Identifying swimmers as water-polo or swim team-mates from visual displays of less than one second

Abstract

Opportunities for ball passing in water-polo may be brief and the decision to pass only informed by minimal visual input. Since researchers using point light displays have shown that the walking or running gait of familiars can be identified, water-polo players may have the ability to recognize team-mates from their swimming gait. To test this hypothesis, members of a water-polo team and a competition swim team viewed two randomized sets of video clips, each less than one second long, of swimmers from both teams sprinting freestyle past a fixed camera. The arm stroke clip sequence showed only the upper body, and the kick sequence showed only the lower body. After viewing each video clip, observers rated their level of certainty as to whether the swimmer presented was a team-mate or not. Discrimination was significantly above chance in both groups. Water-polo players were better able to identify team-mates from their kick, whereas swimmers were better able to do so by viewing arm stroke. Our results suggest that, as with walking and running gait, small amounts of visual information about swimmers can be used for recognition, and so raise the possibility that specific training may be able to improve team-mate classification in water-polo, particularly in newly formed teams.