Constructing knowledge

The most popular model of how students learn is known as the constructivist model of learning. There are variants of this model, but the main features are that learning occurs in the context of pre-existing experiences and ideas, that new concepts are transformed to fit or build on those existing ideas, and that learning occurs in a social or cultural context. Learners are not empty vessels, into which new knowledge can be injected. New concepts, which are consistent with and extend pre-existing experiences and ideas, are easily and effectively assimilated. Learning is difficult, when learners have pre-existing incorrect ideas or alternative conceptions, as they must first unlearn the misconceptions in order to incorporate the new information. In a different context, it is usually much harder and more expensive to retrofit an existing house than to build from scratch. Similarly, it is very hard to overcome bad habits. A previous column in Chemistry in Australia [July 2013, page 35], noted that we simplify ideas when teaching chemistry to younger students, but warned that over-simplication often results in misconceptions that will hinder future learning. Most chemistry educators favour constructivism, because there are similarities with the process of discovery in science. Firstly, the advancement of scientific knowledge builds on past experiences and knowledge: Isaac Newton famously acknowledged, “If I have seen further it is by standing on the shoulders of giants”. Secondly, observations and data of themselves are not meaningful, until that information has been transformed to extend existing ideas: Nobel Laureate Lawrence Bragg wrote, “the important thing in science is not so much to obtain new facts as to discover new ways of thinking about them”. Science as a Human Endeavour (SHE) is one of the strands in the Australian Curriculum. Similarly, one of the learning outcomes in the Draft Chemistry Academic Standards is that graduates will be able to recognise the creative endeavour involved in the acquiring knowledge and to recognise the testable and contestable nature of chemistry. Science is practiced individually and collectively by people. Human beings, who have human virtues and fallibilities, are responsible for scientific advancements. New knowledge is constructed in the minds of learners and scientists. Just as discussions in work teams, workshops, conferences, and the scientific literature, help scientists to extend and improve scientific understanding, the important role of teachers is to guide students to refine, alter and improve their scientific understanding when extending their scientific boundaries.

The potential utility of a staging model as a course specifier: a bipolar disorder perspective.

Staging models are widely used in clinical medicine, and offer an insight into the progressive nature of many disorders. In general, the earlier stages of illness may be associated with a better prognosis and a higher treatment response. Once chronicity is reached, more complex and invasive treatments may be required, and the utility of treatments may decline. There is evidence that treatment response is greatest in the early phases of the disorder. There is also a progressive social and psychological burden of ongoing illness. This is paralleled by the twin notions of neuroprotection, which is supported by increasing evidence that structural changes in the disorder may be progressive and reversible with algorithm appropriate treatment, and that of early intervention, which posits that the optimal window for intervention is early in the illness course. A staging model compliments existing and proposed classifications of bipolar disorder, adding a temporal dimension to a cross sectional view. It may inform treatment choice and prognosis, and could have utility as a course specifier.

Use of expert knowledge to elicit population trends for the koala (Phascolarctos cinereus)

Aim: The koala is a widely distributed Australian marsupial with regional populations that are in rapid decline, are stable or have increased in size. This study examined whether it is possible to use expert elicitation to estimate abundance and trends of populations of this species. Diverse opinions exist about estimates of abundance and, consequently, the status of populations. Location: Eastern and south-eastern Australia Methods: Using a structured, four-step question format, a panel of 15 experts estimated population sizes of koalas and changes in those sizes for bioregions within four states. They provided their lowest plausible estimate, highest plausible estimate, best estimate and their degree of confidence that the true values were contained within these upper and lower estimates. We derived estimates of the mean population size of koalas and associated uncertainties for each bioregion and state. Results: On the basis of estimates of mean population sizes for each bioregion and state, we estimated that the total number of koalas for Australia is 329,000 (range 144,000-605,000) with an estimated average decline of 24% over the past three generations and the next three generations. Estimated percentage of loss in Queensland, New South Wales, Victoria and South Australia was 53%, 26%, 14% and 3%, respectively. Main conclusions: It was not necessary to achieve high levels of certainty or consensus among experts before making informed estimates. A quantitative, scientific method for deriving estimates of koala populations and trends was possible, in the absence of empirical data on abundances.

Evaluation of a knowledge translation and exchange platform to advance non-communicable disease prevention

Coordinated systems are required to ensure evidence-informed practice and evaluation of community-based interventions (CBIs). Knowledge translation and exchange (KTE) strategies show promise, but these require evaluation. This paper describes implementation and evaluation of COOPS, a national KTE platform to support best practice in obesity prevention CBIs. A logic model guides KTE activities including knowledge brokering, networking, tailored communications, training, and needs assessments. A mixed-methods evaluation includes communications data, knowledge brokering database, annual survey of CBIs, pre- and post-event questionnaires, interviews, social network analysis, and case studies. This evaluation will contribute to understanding the process of implementing a KTE platform with CBIs and its reach, quality and effectiveness.

The assessment of denial, cognitive distortions and victim empathy among pedophilic sex offenders. An evaluation of the utility of self-report measures.

The modification of denial, defensiveness, and cognitive distortions and the enhancement of victim empathy are central components in the treatment of pedophilic sex offenders (PSOs) and are thus important factors to evaluate. This review of the literature highlights three broad problems with self-report measures of these variables. First, the psychometric properties of measures vary enormously, with some having no established validity or reliability. Second, the purpose of the measure is generally quite transparent, enabling the respondent to easily pick the socially acceptable responses. Finally, it is difficult to determine which are the best measures to use in assessing PSOs. Measures range from those designed for the general public to those designed specifically for PSOs. Also, they range from those that assess broad processes (e.g., general empathy) to those that assess offensespecific variables (e.g., victim empathy). This article argues that these issues need to be addressed to improve both the assessment of these processes among PSOs and the evaluation of treatment programs for PSOs.

Utility of mitochondrial DNA sequences from four gene regions for systematic studies of Australian freshwater crayfish of the Genus Cherax (Decapoda: Parastacidae)

One of the most important requirements for systematic and phylogenetic studies is the identification of gene regions with the appropriate level of variation for the question of interest. Molecular phylogenetic and systematic studies of freshwater crayfish have made use of DNA sequences mainly from ribosomal genes, especially the 16S rRNA gene region. Thus, little information is available on other potentially useful mitochondrial gene regions for systematic studies in these animals. In this study, we look at nucleotide variation and phylogenetic relations within and between four species of freshwater crayfish of the genus Cherax from the southwest of Western Australia using four fragments amplified from the 16S rRNA, 12S rRNA, Cytochrome Oxidase I (COI), and Cytochrome b (Cyt b) gene regions. Samples of Engaeus strictifrons, Euastacus bispinosus, and Geocharax falcata were also sequenced for comparative purposes. The size of the fragments varied from 358 bp to 600 bp. Across all samples, the four fragments showed significant phylogenetic signal and showed similar proportions of variable sites (28.81–37.33%). Average divergence within species for the mitochondrial gene regions varied from 1.18% to 4.91%, with the 16S rRNA being the least variable and Cyt b the most variable. Average divergence between species ranged 7.63–15.53%, with 16S rRNA being the least variable and COI the most variable. At the generic level, average divergence ranged 17.21–23.82%. Phylogenetic analyses of the 16S rRNA, 12S rRNA, and COI regions generated four clades consistent with the presence of four species previously identified on the basis of allozyme and morphological studies. The relationships among samples were largely congruent across the data set, although some relationships remained unresolved. Not all samples could be amplified using the Cyt b primers, and some of those that were showed quite anomalous relationships, suggesting that one or more Cyt b pseudogenes were being amplified.

Assessing the case for mandatory folate fortification : policy-making in the face of scientific uncertainties

This paper presents the view that policymakers face scientific uncertainties in assessing the case for mandatory folate fortification as a policy response to epidemiological evidence of the relationship between folate and neural tube defects. Moreover, the resolution of these uncertainties is confounded by the under-resourced state of nutrition information systems in Australia and New Zealand. The uncertainties relate to potential risks and benefits associated with the intervention for the target group and the population in general. These risks and benefits reflect the mismatch between evidence and policy that arises when addressing a presumed genetic abnormality in at-risk individuals with an intervention that is population-wide in its scope. There is an urgent need to conduct ongoing national nutrition surveys and monitor and evaluate policy interventions to strengthen the capacity of nutrition information systems to inform decision-making for this current, and future, public health nutrition policy.

The utility of the trans-theoretical model of behavior change in the treatment of sex offenders

This paper discusses the use of the Trans-theoretical Model of Behavior Change in the treatment of sex offenders. Constructs within this theory are the Stages of Change, Processes of Change and Decisional Balance. The first section of this paper provides a brief description of these constructs. The second section provides a brief review of research related to these constructs and discusses the implications of this research in relation to the treatment of sex offenders. The third section of this paper provides a practical description of the use of the constructs of the Trans-theoretical Model of Behaviour Change in the treatment of sex offenders. Although the validity of this model among sex offenders requires further investigation, the Trans-theoretical Model of Behavior Change appears to have considerable utility as an overarching theoretical model to conceptualize and facilitate behavior change among sex offenders.

The high court and the utility of multiple judgments

Recently, the High Court has been criticised for its supposed increasing tendency to deliver multiple majority judgments. Ostensibly this impairs the capacity for the Court to clarify and unify the law, thereby making it more difficult for citizens to plan and coordinate their affairs. This criticism of the High Court is unsound. First, there is no evidence to suggest that the High Court is now more fragmented than it has been during other periods of its history. Secondly, the precise reasoning process (and the underlying jurisprudence reflected by this) is a cardinal aspect of the development of precedent and legal principle. Convergence in conclusion only is of little utility and does not promote certainty and clarity in the law. One cannot make an informed assessment of the impact and breadth of a decision without an understanding of the (actual) premise underpinning the decision. It is for this reason that legislation is such a poor vehicle for declaring the law and why in recent decades there has been an increasing degree of reliance on extraneous material to assist in the interpretation of legislation. Conclusion without (genuine) reasons is not highly instructive. Coerced agreement, no matter how subtle, is undesirable. The High Court should resist calls to deliver more single majority judgments.