Late Pleistocene/early Holocene maritime interaction in Southeastern Indonesia - Timor Leste

This study analysed over 1000 obsidian stone artefacts excavated from two adjoining shelters at Tron Bon Lei on Alor Island Indonesia using portable XRF. The study showed an unambiguous separation of three different source locations (Groups 1, 2 and 3). Two sources (Group 2 and 3a, b, c) dominate the assemblage numerically. Group 1 and 2 indicate use of a single volcanic formation with a strong match between Group 1 artefacts and artefacts from sites in Timor Leste. Obsidian occurs in the earliest occupation layer in the Alor sites but does not include Group 1 artefacts which occur only after approx. 12,000 cal BP. Currently the geographical location of the Group 1 outcrop is unknown, however, based on the late appearance of the Group 1 artefacts in the Alor sequence it is likely that the location is not on Alor, but rather on another island of the Sunda chain. The dating of Group 1 artefacts in widely spaced sites on the never geographically connected islands of Timor and Alor indicates that maritime interaction between islands began by at least the terminal Pleistocene. The distribution of the obsidian in Tron Bon Lei shelter Pit B shows that there were periods of more intense interaction punctuated by periods when interaction declined or ceased

Carpenters Gap 1: A 47,000 year old record of indigenous adaption and innovation

Here we present the first detailed analysis of the archaeological finds from Carpenters Gap 1 rockshelter, one of the oldest radiocarbon dated sites in Australia and one of the few sites in the Sahul region to preserve both plant and animal remains down to the lowest Pleistocene aged deposits. Occupation at the site began between 51,000 and 45,000 cal BP and continued into the Last Glacial Maximum, and throughout the Holocene. While CG1 has featured in several studies, the full complement of 100 radiocarbon dates is presented here for the first time in stratigraphic context, and a Bayesian model is used to evaluate the age sequence. We present analyses of the stone artefact and faunal assemblages from Square A2, the oldest and deepest square excavated. These data depict a remarkable record of adaptation in technology, mobility, and diet breadth spanning 47,000 years. We discuss the dating and settlement record from CG1 and other northern Australian sites within the context of the new dates for occupation of Madjedbebe in Arnhem Land at 65,000 years (±5700), and implications for colonisation and dispersal within Sahul.We thank the Bunuba Aboriginal Corporation for their assistance in this work. Radiocarbon dates obtained in 2013 and 2014 and micromorphological research by Vannieuwenhuyse were funded by the Australian Research Council grant LP100200415 ‘Lifeways of the first Australians’ with contributions from the Kimberley Foundation Australia and the Department of Sustainability, Water, Populations and Communities, awarded to O'Connor and Balme, as well as support from the Centre of Excellence for Australian Biodiversity and Heritage as well as support from the Australian Research Council Centre of Excellence for Australian Biodiversity and Heritage (CE170100015)

The convergence of virtual reality and social networks: threats to privacy and autonomy

The rapid evolution of information, communication and entertainment technologies will transform the lives of citizens and ultimately transform society. This paper focuses on ethical issues associated with the likely convergence of virtual realities (VR) and social networks (SNs), hereafter VRSNs. We examine a scenario in which a significant segment of the world’s population has a presence in a VRSN. Given the pace of technological development and the popularity of these new forms of social interaction, this scenario is plausible. However, it brings with it ethical problems. Two central ethical issues are addressed: those of privacy and those of autonomy. VRSNs pose threats to both privacy and autonomy. The threats to privacy can be broadly categorized as threats to informational privacy, threats to physical privacy, and threats to associational privacy. Each of these threats is further subdivided. The threats to autonomy can be broadly categorized as threats to freedom, to knowledge and to authenticity. Again, these three threats are divided into subcategories. Having categorized the main threats posed by VRSNs, a number of recommendations are provided so that policy-makers, developers, and users can make the best possible use of VRSNs

Predicting suicide following self-harm : A systematic review of risk factors and risk scales

Background People with a history of self-harm are at a far greater risk of suicide than the general population. However, the relationship between self-harm and suicide is complex. Aims To undertake the first systematic review and meta-analysis of prospective studies of risk factors and risk assessment scales to predict suicide following self-harm. Method We conducted a search for prospective cohort studies of populations who had self-harmed. For the review of risk scales we also included studies examining the risk of suicide in people under specialist mental healthcare, in order to broaden the scope of the review and increase the number of studies considered. Differences in predictive accuracy between populations were examined where applicable. Results Twelve studies on risk factors and 7 studies on risk scales were included. Four risk factors emerged from the meta-analysis, with robust effect sizes that showed little change when adjusted for important potential confounders. These included: previous episodes of self-harm (hazard ratio (HR) = 1.68, 95% CI 1.38–2.05, K = 4), suicidal intent (HR = 2.7, 95% CI 1.91–3.81, K = 3), physical health problems (HR = 1.99, 95% CI 1.16–3.43, K = 3) and male gender (HR = 2.05, 95% CI 1.70–2.46, K = 5). The included studies evaluated only three risk scales (Beck Hopelessness Scale (BHS), Suicide Intent Scale (SIS) and Scale for Suicide Ideation). Where meta-analyses were possible (BHS, SIS), the analysis was based on sparse data and a high heterogeneity was observed. The positive predictive values ranged from 1.3 to 16.7%. Conclusions The four risk factors that emerged, although of interest, are unlikely to be of much practical use because they are comparatively common in clinical populations. No scales have sufficient evidence to support their use. The use of these scales, or an over-reliance on the identification of risk factors in clinical practice, may provide false reassurance and is, therefore, potentially dangerous. Comprehensive psychosocial assessments of the risks and needs that are specific to the individual should be central to the management of people who have self-harmed

Cave stratigraphies and cave breccias: Implications for sediment accumulation and removal models and interpreting the record of human occupation

Many of the key debates in archaeology hinge on the chronology and interpretation of data gathered from cave and rockshelter stratigraphies, especially those in karstic limestone environments which are selectively targeted by archaeologists because of their superior preservation characteristics. It has long been recognized that such sites often contain a variety of cemented deposits including cave breccias and that some breccias contain anthropogenic inclusions such as stone artefacts, shell and burnt animal bones. Cementation enhances the survival through time of such brecciated deposits. This can result in chrono-stratigraphic intervals surviving on cave walls and speleothems that are no longer represented in the stratigraphy of cave floors. This has important implications for understanding apparent presence/ absence of human occupation and cultural continuity as seen in archaeo-stratigraphy in caves and rockshelters, especially in relation to human migration in the humid tropics in SE Asia and the Pacific, and over Pleistocene to Holocene timescales. Here we discuss localized breccia formation, the erosional processes that leave remnant deposits adhering to walls and speleothems at heights well above current cave floors, and the possible significance of local and regional processes, especially changing base levels, in triggering gutting out phases impacting cave floor sediment architectures. Equally significant in terms of chronological completeness, representativeness and bias is the contribution made by cultural materials encased in older breccias as they erode and are (re-)incorporated into younger accumulating cultural deposits. Case studies from cave sites in Papua New Guinea and Timor Leste are used to illustrate these issues

Descriptive Analysis of a Baseline Concussion Battery Among U.S. Service Academy Members: Results from the Concussion Assessment, Research, and Education (CARE) Consortium

Introduction The prevalence and possible long-term consequences of concussion remain an increasing concern to the U.S. military, particularly as it pertains to maintaining a medically ready force. Baseline testing is being used both in the civilian and military domains to assess concussion injury and recovery. Accurate interpretation of these baseline assessments requires one to consider other influencing factors not related to concussion. To date, there is limited understanding, especially within the military, of what factors influence normative test performance. Given the significant physical and mental demands placed on service academy members (SAM), and their relatively high risk for concussion, it is important to describe demographics and normative profile of SAMs. Furthermore, the absence of available baseline normative data on female and non-varsity SAMs makes interpretation of post-injury assessments challenging. Understanding how individuals perform at baseline, given their unique individual characteristics (e.g., concussion history, sex, competition level), will inform post-concussion assessment and management. Thus, the primary aim of this manuscript is to characterize the SAM population and determine normative values on a concussion baseline testing battery. Materials and Methods All data were collected as part of the Concussion Assessment, Research and Education (CARE) Consortium. The baseline test battery included a post-concussion symptom checklist (Sport Concussion Assessment Tool (SCAT), psychological health screening inventory (Brief Symptom Inventory (BSI-18) and neurocognitive evaluation (ImPACT), Balance Error Scoring System (BESS), and Standardized Assessment of Concussion (SAC). Linear regression models were used to examine differences across sexes, competition levels, and varsity contact levels while controlling for academy, freshman status, race, and previous concussion. Zero inflated negative binomial models estimated symptom scores due to the high frequency of zero scores. Results Significant, but small, sex effects were observed on the ImPACT visual memory task. While, females performed worse than males (p < 0.0001, pη2 = 0.01), these differences were small and not larger than the effects of the covariates. A similar pattern was observed for competition level on the SAC. There was a small, but significant difference across competition level. SAMs participating in varsity athletics did significantly worse on the SAC compared to SAMs participating in club or intramural athletics (all p’s < 0.001, η2 = 0.01). When examining symptom reporting, males were more than two times as likely to report zero symptoms on the SCAT or BSI-18. Intramural SAMs had the highest number of symptoms and severity compared to varsity SAMs (p < 0.0001, Cohen’s d < 0.2). Contact level was not associated with SCAT or BSI-18 symptoms among varsity SAMs. Notably, the significant differences across competition level on SCAT and BSI-18 were sub-clinical and had small effect sizes. Conclusion The current analyses provide the first baseline concussion battery normative data among SAMs. While statistically significant differences may be observed on baseline tests, the effect sizes for competition and contact levels are very small, indicating that differences are likely not clinically meaningful at baseline. Identifying baseline differences and significant covariates is important for future concussion-related analyses to inform concussion evaluations for all athlete levels

Getting to know you: Engagement and relationship building: First interim national positive futures case study research report

This report represents the culmination of the first phase of the Positive Futures (PF) Case Studies Research Project rather than a definitive set of findings as such. Rather like the PF programme itself it is very much a work in progress which is evolving all the time in the context of the action research approach we have adopted. This approach involves a cycle of action and reflection, with both the projects and research adapting in relation to the themes that emerge from the study as it progresses. Nevertheless whilst this element of the research has been concerned as much with the establishment of relations with projects and participants as investigating the relationships between them, we have begun to identify a number of tentative themes and findings. These themes are presented in a fashion which is intended to guide the future direction of projects every bit as much as to gain abstract theoretical insight. Yet this recognition of the importance of practicality and direction should not distract from the importance of gaining a wider contextual feel for the programme. For whilst this summary is intended to highlight the key themes emerging from the research and the policy and practice issues associated with them, it is in the detail of the main report that a full appreciation of the PF approach emerges. It is from the more narrative accounts in these subsequent parts that we have drawn the conclusions and recommendations presented here and which will provide the baselines against which we assess future progress. Indeed these accounts are themselves drawn from three regional reports focused on the seven case studies that constitute the overall national research project

The site of Leki Wakik, Manatuto District, Timor‑Leste

Leki Wakik is a large hilltop site with several large stone walls and circular stone arrangements located within the Manatuto district in the central region of Timor-Leste. It is similar to other hilltop sites in the area whose function and occupation time frame have been subject to debate (e.g. Lape and Chao 2008; O’Connor et al. 2012). In August 2011, a team from The Australian National University (ANU) supported by Timorese workers mapped the site and excavated five test pits intended to assess site use and occupation time frame. A substantial artefact assemblage was recovered that includes lithics, earthenware pottery, ceramics and faunal remains, which provides evidence of the use of the site and the surrounding landscape and, particularly, whether unusual circular stone arrangements demarcate special activity or occupation areas. A series of radiocarbon dates from an unusual area surrounded on three sides by large stone walls provide chronological context for the site