The Virtual Solar System Project: Developing Conceptual Understanding of Astronomical Concepts Through Building Three-Dimensional Computational Models

The Virtual Solar System (VSS) course described in this paper is one of the first attempts to integrate three-dimensional (3D) computer modeling as a central component of an introductory undergraduate astronomy course. Specifically, this study assessed the changes in undergraduate university students' understanding of astronomy concepts as a result of participating in an experimental introductory astronomy course in which the students constructed 3D models of different astronomical phenomena. In this study, we examined students' conceptual understanding concerning three foundational astronomical phenomena: the causes of lunar and solar eclipses, the causes of the Moon's phases, and the reasons for the Earth's seasons. Student interviews conducted prior to the course identified a range of student alternative conceptions previously identified in the literature regarding the dynamics and mechanics of the Solar System. A previously undocumented alternative conception to explain lunar eclipses is identified in this paper. The interviews were repeated at the end of the course in order to quantitatively and qualitatively assess any changes in student conceptual understanding. Generally, the results of this study revealed that 3D computer modeling can be a powerful tool in supporting student conceptualization of abstract scientific phenomena. Specifically, 3D computer modeling afforded students the ability to visualize abstract 3D concepts such as the line of nodes and transform them into conceptual tools, which in turn, supported the development of scientifically sophisticated conceptual understandings of many basic astronomical topics. However, there were instances where students' conceptual understanding was incomplete and frequently hybridized with their existing conceptions. These findings have significant bearing on when and in what domains 3D computer modeling can be used to support student conceptual understanding of astronomy concepts.     

Fitting derivational morphophonology into a developmental model of reading

Oral language is the foundation on which literacy initially builds. Between early developing oral language skills and fluent reading comprehension emerge several types of metalinguistic ability, including phonological and morphological awareness. In this study, a developmental sequence is proposed, beginning with receptive language followed by phonological awareness, morphological awareness, and a new metalinguistic task measuring oral morphophonological accuracy (MPA), followed by decoding and culminating in reading comprehension. MPA is a measure of accurate primary stress placement in the production of derived words with non-neutral, stress changing suffixes (e.g., -ity). A path analysis with data from 76 third graders was used to evaluate the direct and indirect effects of these variables. The developmental model was confirmed, and a metalinguistic continuum, with MPA emerging after both PA and MA, was supported. Decoding and receptive language were the best unique predictors of reading comprehension. Surprisingly, MPA was more important to decoding than was PA, whereas MA was only indirectly implicated in both decoding and reading comprehension.     

(Mis)appropriations of criteria and standards‐referenced assessment in a performance‐based subject

This paper draws on semi‐structured interview data and participant observations of senior secondary Physical Education (PE) teachers and students at two school sites across 20 weeks of the school year. The data indicated that the teachers in this study made progressive judgements about students’ level of achievement across each unit of work without explicit or overt reference to the criteria and standards represented in the schools’ work programmes and in the Senior PE syllabus. The teachers’ justification for such an approach was that the criteria and standards had become for them sufficiently ‘internalised’. Determining students’ levels of achievement was for the teachers somewhat ‘intuitive’, being reliant on their memory of students’ performances, and influenced by the construct‐irrelevant affective characteristics of the students. It is argued in this paper that such construct‐irrelevance compromised the construct validity and possible inter‐rater reliability of the decisions made and advantaged some students and marginalised others on the basis of characteristics that were not specifically related to the learning expected from following the syllabus. The potential inequities of such an approach are discussed and suggestions are made for the consolidation of the validity and reliability of teachers’ judgements.     

‘Do I have a choice?’ The influences of family values and investments on Chinese migrant young people's lifestyles and physical activity participation in Australia

This paper examines Chinese migrant young people's lifestyles and physical activity experiences in relation to the values and cultural investments of their families in Australia. The data in this paper were taken from a larger-scale study underpinned by a critical and interpretive ethnographic method conducted in two school sites. The young people's lives were significantly shaped by dominant Chinese cultural norms and traditional notions of gender. Bourdieuian concepts are drawn upon to explain the (re)production of the Chinese young people's habitus cultivated at home. Based on the young people's pursuit of cultural capital as a consequence of familial values, discussion also focuses on the agency of these young people in relation to their lifestyle choices. Dominant discourses in the ‘talk’ of these young people included their notions of excelling, hyper-investment in academic success and, especially for the girls, skin colour and safety. Traditional Chinese family power relations limited the choices these young people had regarding physical activity which was complicated by the cultural and social fluidity of their lived experiences. The inter-generational flow of habitus and capital of these Chinese migrant young people's families tended to privilege a particular set of discourses based on gender, race, social class and hierarchical practices that resonated with traditional Confucian philosophy.     

From Flexibility to Constraint: The Contrastive Use of Lexical Tone in Early Word Learning

Infants must develop both flexibility and constraint in their interpretation of acceptable word forms. The current experiments examined the development of infants' lexical interpretation of non‐native variations in pitch contour. Fourteen‐, 17‐, and 19‐month‐olds (Experiments 1 and 2, N = 72) heard labels for two novel objects; labels contained the same syllable produced with distinct pitch contours (Mandarin lexical tones). The youngest infants learned the label–object mappings, but the older groups did not, despite being able to discriminate pitch differences in an object‐free task (Experiment 3, N = 14). Results indicate that 14‐month‐olds remain flexible regarding what sounds make meaningful distinctions between words. By 17–19 months, experience with a nontonal native language constrains infants' interpretation of lexical tone.     

The effect of bilateral asymmetry of muscle strength on the height of a squat jump: a computer simulation study

The aim of this study was to examine the effect of bilateral asymmetry of muscle strength on maximal height of the squat jump. A computer simulation technique was used to develop two kinds of 3D human lower limb musculoskeletal model (model-symmetry and model-asymmetry). The total muscle strength of the two models was set to be identical. Bilateral muscle strength was equal in the model-symmetry simulation, while the model-asymmetry simulation was performed with a 10% bilateral strength asymmetry. A forward dynamics approach was used to simulate squat jumps. The squat jumps were successfully generated, producing jump heights of 0.389 m for model-symmetry and 0.387 m for model-asymmetry. The small difference in height (0.5%) indicated that the effect of the 10% bilateral asymmetry of muscle strength on jump height is negligible. With model-asymmetry, the strong leg compensated for the muscle strength deficit of the weak leg. Importantly, the mono-articular and large extensor muscles of the hip and knee joint of the strong leg, including the gluteus maximus, adductor magnus, and vasti, compensated for the muscle strength deficit of the weak leg.     

The myth of the research‐led teacher

This paper examines the contention that achievement in research is a prerequisite for effective teaching in higher education. It also explores university level teaching more generally with the purpose of examining the links between teaching and research. Concept mapping, in particular, is described as a means of exploring both the knowledge structures of experts (teachers and researchers) and the cognitive changes that are indicative of meaningful learning among students. We use the approach to suggest that rich and complex networks are indicative of expert status, but that these are seldom made explicit to students in the course of teaching. Instead, simple, linear structures comprise most lesson plans or teaching sequences. This linearity is often made transparent through the lecturers’ use of PowerPoint presentations to structure teaching. Thus the transmission mode of teaching predominates in HE and evidence of authentic research‐led teaching remains scant. This is likely to reinforce surface learning outcomes among university students and be an impediment to the emergence of expert status. The linear chains that are commonly espoused in teaching lend themselves to rote learning strategies rather than to individual meaning making. The approach we describe here has the potential to reinstate expert status as the prime qualification for teaching in higher education. Where concept mapping is used to share and explore knowledge structures between students and experts, then learning can be shown to occur in ways that are synonymous with research and discovery. Using this approach, the teacher–student distinction becomes legitimately blurred so that the sharing and advancement of knowledge are concomitant. In conclusion, we suggest that this is a basis for a pedagogy that is appropriate to HE and distinct from the compulsory sector.