The effects of target length on the visual control of step length for hard and soft impacts

Adjustments to gait were examined when positioning the foot within a narrow target at the end of an approach for two impact conditions, hard and soft. Participants (6 M, 6 F) ran toward a target of three lengths along a 10-m walkway consisting of two marker strips with alternating black and white 0.5-m markings. Five trials were conducted for each target length and impact task, with trials block randomized between the 6 participants of each gender. A 50-Hz digital video camera panned and filmed each trial from an elevated position adjacent to the walkway. Video footage was digitized to deduce the gait characteristics. A linear speed/accuracy tradeoff between target length and approach time was found for both impact tasks (hard, r = 0.99, p < 0.01; soft, r = 0.96, p < 0.05). For the hard-impact task, visual control time increased linearly (r = 0.99, p < 0.05) when whole-body approach velocity decreased. Visual control time was unaffected by whole-body approach velocity in the soft-impact task. A constant tau-margin of 1.08 describes the onset of visual control when approaching a target while running, with the control of braking during visual control described by a tau-dot of –0.85. Further research is needed to examine the control of braking in different targeting tasks.

Information-based regulation of high-velocity foot-targeting tasks

Judging time-to-contact with a target is an important criterion for avoiding harm in everyday walking and running tasks, and maximizing performance in high-velocity sporting tasks. The information-based regulation of step length and duration during target-directed locomotion was examined in relation to gait mode, approach velocity, target task, expertise, and sporting performance during a series of four experiments. The first three experiments examined novice performers (Each n=12, 6 males, 6 females), whilst the last experiment examined expert gymnasts (n=5). Two reference strips with alternating 50cm black and white intervals were placed on either side of the approach strip for all of the experiments. One 50Hz-panning video camera filmed the approach from an elevated position. In Experiment 4, two stationary 250Hz cameras filmed the post-flight performance of the gymnastic vaults and, in addition, two qualified judges provided a performance score for each vaulting trial. The panning video footage in each experiment was digitized to deduce the gait characteristics. In Experiment 4, the high-speed video footage was analyzed three-dimensionally to obtain the performance measures such as post-flight height. The utilization of visual stimulus in target-directed locomotion is affected by the observer's state of motion as characterized by the mode of locomotion and also often the speed of locomotion. In addition, experience plays an important role in the capacity of the observer to utilize visual stimulus to control the muscular action of locomotion when either maintaining or adjusting the step mechanics. The characteristics of the terrain and the target also affect the observer's movement. Visual regulation of step length decreases at higher approach speeds in novice performers, where as expert performers are capable of increasing visual regulation at higher approach speeds. Conservatism in final foot placement by female participants accounts for the observed increase in distance from the critical boundary of the obstacle relative to toe placement. Behavioural effects of gender thus affect the control of final foot placement in obstacle-directed locomotion. The visual control of braking in target-directed locomotion is described by a tau-dot of-0.54. When tau-dot is below -0.54 a hard collision with the obstacle will occur, however, when tau-dot is above -0.54, a soft collision with the target will occur. It is suggested that the tau-dot margin defining the control of braking reveals the braking capacity of the system. In the target-directed locomotion examined a tau-dot greater than -0.70 would possibly exceed the braking capacity of the system, thus, leading to injury if performed. The approach towards the take-off board and vaulting horse in gymnastics is an example of target-directed locomotion in sport. Increased visual regulation of the timing and length of each step is a requirement for a fast running approach, a fundamental building block for the execution of complex vaults in gymnastics. The successful performance of complex vaults in gymnastics leads towards a higher judge's score. Future research suggestions include an investigation of visual regulation of step length in curved target-directed locomotion.

Can experiential learning improve emotional intelligence and can that, in turn, improve the work performance of middle managers?

A group of middle managers in the Australian arm of a large Global company participated in a program of experiential leadership training over a period of one year. One aim of the program was increased interpersonal skills and awareness. Change was measured using a mixed quantitative and qualitative longitudinal design. Pre and post-training measures of emotional intelligence were obtained using the EIQ (Dulewicz & Higgs, 2000) and compared with content analysis of journals kept by participants during the program. The dependent variable was measured by pre and post training measures of work performance. Findings are discussed in terms of their implications for management development as well as for further research.

Kant, or the crack in the universal : Slavoj Zizek's politicising the transcendental turn

This paper examines Slavoj Zizek’s reading of Immanuel Kant. Its undergirding argument is that Zizek’s work as a whole- up to and including his politically radical statements, which have become more and more prominent since 1997- is conceivable as a project in the rereading of the Kantian ‘Copernican Revolution’ via Lacanian psychoanalysis. Critics now agree that Zizek’s orienting aim is to write a philosophy of politics, as more recent texts, like The Ticklish Subject make clear. (Kay, 2003; Sharpe, 2004; Dean 2006) If Zizek’s philosophy is ultimately a philosophy of politics, however, Zizek’s political philosophy is grounded in a wider post or ‘neo’-Kantian philosophy of subjectivity.
The essay has three major parts. Part I gives Zizek’s reading of Kant on the subject of apperception. Part II recounts Zizek’s pivotal reading of Kant on the sublime, which he ties closely to the problematics of the ‘Transcendental Dialectic’ of the first Critique. Part III then examines Zizek’s conception of subjectivity in terms of the faculties (and especially the faculty of imagination) that Kant argues are involved in the transcendental constitution of objects in the first half of The Critique of Pure Reason.
In the Conclusion, the force of the paper’s subtitle—‘Politicising the Transcendental Turn&rsquo;—will become manifest. I lay out three principles of Zizek’s ‘neoKantian/Hegelian’ ontology. These also make clear how his philosophy of political agency is grounded in this apparently suprapolitical or solely philosophical reading of Kant.

New world orders and the dystopian turn : transforming visions of territoriality and belonging in recent Australian children's fiction

Through the 1990s and into the new millennium, Australian children's literature responded to a conservative turn epitomised by the Howard government and to new world order imperatives of democracy, the market economy, globalisation, and the IT revolution. These responses are evidenced in the ways that children's fiction speaks to the problematics of representation and cultural identity and to possible outcomes of devastating historical and recent catastrophes. Consequently, Australian children's fiction in recent years has been marked by a dystopian turn. Through an examination of a selection of Australian children's fiction published between 1995 and 2003, this paper interrogates the ways in which hope and warning are reworked in narratives that address notions of memory and forgetting, place and belonging. We argue that these tales serve cautionary purposes, opening the way for social critique, and that they incorporate utopian traces of a transformed vision for a future Australia. The focus texts for this discussion are: Secrets of Walden Rising (Allan Baillie, 1996), Red Heart (Victor Kelleher, 2001), Deucalian (Brian Caswell, 1995), and Boys of Blood and BOlle (David Metzenthen, 2003).

Only Agamben can save us? Against the messianic turn recently adopted in critical theory

In this paper, I offer a strong criticism of Giorgio Agamben’s recent political texts. I argue that these texts bring to fruition a larger, contentious trend in the theoretical academy coupling one-dimensional, pessimistic accounts of modernity with strands of messianism. Since the political prospects of messianism, as Agamben’s analyses show, are very thin indeed, I reflectively question the presuppositions that lead him to this prescriptive juncture. In Part I, recurring to Scholem’s classic analyses of Jewish messianism, I show how Agamben’s messianism borrows more or less directly (in The Open) from kabalistic, antinomian, utopian messianism. Having established this exegetical point, I argue two theses in parts II and III. The first, specifically theoretical thesis is that Agamben is driven into his political messianism by the transcendental logic of his analyses of ‘the political’, one which by its nature occludes meaningfully political distinctions by instead seeking out their ontological grounds. The second, specifically political thesis is that the widespread embrace of ontological messianism by thinkers in the post-Marxian academy is a symptom of, rather than a cure for, the wider malaise of the political left in the first world. If critical theory is serious about engaging with progressive praxis, one thing it must do is recall the difference between politics and prima philosophia, so that it does not continue to seek out ‘redemption’ – or at least an apology – in the bowels of the latter.

Visual narratives in the children's picture story book : an investigation of the extent to which the formal structuring of a visual narrative retrieves a pastiche of past experiences and images which in turn shapes and redirects the story

Throughout this research, the notion that illustrators of children's books embark on two types of activity has been reinforced at every turn. On one hand the artist acknowledges the external world by organising images of actions and events in the contexts of place and time. This process involves bringing ideas into a physical form and demands the structuring of characters, settings, and story development. Planning and decisions are informed by imperatives that recognise the need for conventions of articulation and communication to a particular target audience. These then become a mayor priority of bookmaking and are constantly impacted on by publishers1 demands and ethical constraints. The other perspective sees the illustrator as expresser where the core of visual narratives for children celebrates the potency of imagination. Here dreams, fantasies, memories and the unconscious become the conduits to shaping sequential images. The artist is engaged not simply in visually telling a story, but rather telling facets of his or her own story. This exegesis traces the evolution of my own picture story book Eddie's Fantastic Fortnight published by Five Mile Press Publishers in tandem with the insights and reflections of five of Australia's most prominent illustrators. It examines whether the structure invested in a visual narrative liberates expressive response, ascribing to the premise that bookmaking plays an informing role to imagination. Equally it adopts the alternative position which asserts that the essence of children's books is indeed fantasy, memory and dreams. This proposition views imagination and inspiration as the primary catalyst around which illustrators build their narrative. In the often lengthy processes of bookmaking, these considerations constantly shift. I have attempted to explore and reveal these mobile and ever changing priorities, not only in my own work, but also through leading exponents in the field.

Popular fiction and the emotional turn : the case of women in late Victorian Britain

Many within the history profession today consider that we are experiencing an ‘emotional turn&rsquo;, a perception that has been spurred by a recent proliferation of research centres and outpouring of publications exploring the concept of emotion. Interest in this field looks likely to grow, although there are methodological challenges that have yet to be overcome, as, of course, there are with any newly emerging field of study. One main concern is source material. Attempting to access such an elusive and intensely subjective area of historical inquiry as emotions requires seeking out new sources, as well as returning to old ones with a fresh eye, with new questions in mind. In the specific realm of the emotional lives of women living in Victorian and Edwardian Britain, fiction proves a promising source – popular fiction especially. This is due to the fact that this was the era that ushered in the modern bestseller, novels that more often than not explored the everyday and the emotional, novels that were thought to have been ‘devoured’ by women in particular. This essay plots recent developments in the burgeoning area of emotions history, as well as those that have taken place in relation to the use of fiction as evidence in a history of women’s interior lives. It argues that, at this point in the development of emotions history, when questions of methodology, interdisciplinarity and sources are being addressed more widely, consideration should be given to popular fiction as a readily available pathway, if not an uncomplicated one, into the emotions of the past.

Authoritarian deliberation : the deliberative turn in Chinese political development

Authoritarian rule in China is now permeated by a wide variety of deliberative practices. These practices combine authoritarian concentrations of power with deliberative influence, producing the apparent anomaly of authoritarian deliberation. Although deliberation is usually associated with democracy, they are distinct phenomena.Democracy involves the inclusion of individuals in matters that affect them through distributions of empowerments such as votes and rights. Deliberation is a mode of communication involving persuasion-based influence. Combinations of non-inclusive power and deliberative influence—authoritarian deliberation— are readily identifiable in China, probably reflecting failures of command authoritarianism under the conditions of complexity and pluralism produced by market-oriented development. The concept of authoritarian deliberation frames two possible trajectories of political development in China: the increasing use of deliberative practices stabilizes and strengthens authoritarian rule, or deliberative practices serve as a leading edge of democratization.

From food to offspring down : tissue-specific discrimination and turn-over of stable isotopes in herbivorous waterbirds and other avian foraging guilds

Isotopic discrimination and turn-over are fundamental to the application of stable isotope ecology in animals. However, detailed information for specific tissues and species are widely lacking, notably for herbivorous species. We provide details on tissue-specific carbon and nitrogen discrimination and turn-over times from food to blood, feathers, claws, egg tissues and offspring down feathers in four species of herbivorous waterbirds. Source-to-tissue discrimination factors for carbon (δ¹³C) and nitrogen stable isotope ratios (δ¹⁵N) showed little variation across species but varied between tissues. Apparent discrimination factors ranged between &minus;0.5 to 2.5‰ for δ¹³C and 2.8 to 5.2‰ for δ¹⁵N, and were more similar between blood components than between keratinous tissues or egg tissue. Comparing these results with published data from other species we found no effect of foraging guild on discrimination factors for carbon but a significant foraging-guild effect for nitrogen discrimination factors.

Turn-over of δ¹³C in tissues was most rapid in blood plasma, with a half-life of 4.3 d, whereas δ¹³C in blood cells had a half-life of approximately 32 d. Turn-over times for albumen and yolk in laying females were similar to those of blood plasma, at 3.2 and 6.0 d respectively. Within yolk, we found decreasing half-life times of δ¹³C from inner yolk (13.3 d) to outer yolk (3.1 d), related to the temporal pattern of tissue formation.

We found similarities in tissue-specific turn-over times across all avian species studied to date. Yet, while generalities regarding discrimination factors and tissue turn-over times can be made, a large amount of variation remains unexplained.

Feminist struggles to mobilise progressive spaces within the ‘boy-turn��� in gender equity and schooling reform

This article presents the stories of two Australian feminist educators, ‘Kath’ and ‘Kim’. Drawn from a small‐scale interview‐based study, the stories highlight these women’s struggles to mobilise progressive spaces within the current boy‐focused equity and schooling agenda. Such struggles are located within the new possibilities for feminist intervention enabled by current educational trends in Australia. The stories focus on Kath and Kim’s experiences leading the professional development of teachers from several schools in Queensland (Australia) as part of the $19.4 million national initiative, Success for Boys. The article draws on feminist understandings of ‘progressive’ spaces and highlights the requisite conditions necessary for mobilising such spaces. In particular, Kath and Kim’s stories bring to light the powerful role emotions continue to play in both enabling and constraining gender reform and the continued significance of attending to, and working with, such emotions to enhance the pursuit of gender justice in schools.