Edge-enhanced disruptive camouflage impairs shape discrimination

Disruptive colouration (DC) is a form of camouflage comprised of areas of pigmentation across a target’s surface that form false edges, which are said to impede detection by disguising the outline of the target. In nature, many species with DC also exhibit edge enhancement (EE); light areas have lighter edges and dark areas have darker edges. EE DC has been shown to undermine not only localisation but also identification of targets, even when they are not hidden (Sharman, Moncrieff, & Lovell, 2018). We use a novel task, where participants judge which “snake” is more “wiggly,” to measure shape discrimination performance for three colourations (uniform, DC, and EE DC) and two backgrounds (leafy and uniform). We show that EE DC impairs shape discrimination even when targets are not hidden in a textured background. We suggest that this mechanism may contribute to misidentification of EE DC targets

The Value of Evidence-Based Computer Simulation of Oral Health Outcomes for Management Analysis of the Alaska Dental Health Aide Program

Objectives: To create an evidence‐based research tool to inform and guide policy and program managers as they develop and deploy new service delivery models for oral disease prevention and intervention. Methods: A village‐level discrete event simulation was developed to project outcomes associated with different service delivery patterns. Evidence‐ based outcomes were associated with dental health aide activities, and projected indicators (DMFT, F+ST, T‐health, SiC, CPI, ECC) were proxy for oral health outcomes. Model runs representing the planned program implementation, a more intensive staffing scenario, and a more robust prevention scenario, generated 20‐year projections of clinical indicators; graphs and tallies were analyzed for trends and differences. Results: Outcomes associated with alternative patterns of service delivery indicate there is potential for substantial improvement in clinical outcomes with modest program changes. Not all segments of the population derive equal benefit when program variables are altered. Children benefit more from increased prevention, while adults benefit more from intensive staffing. Conclusions: Evidence‐ based simulation is a useful tool to analyze the impact of changing program variables on program outcome measures. This simulation informs dental managers of the clinical outcomes associated with policy and service delivery variables. Simulation tools can assist public health managers in analyzing and understanding the relationship between their policy decisions and long‐term clinical outcomes.The Ford Foundation

Dissociating the effect of disruptive colouration on localisation and identification of camouflaged targets

Disruptive camouflage features contrasting areas of pigmentation across the animals’ surface that form false edges which disguise the shape of the body and impede detection. In many taxa these false edges feature local contrast enhancement or edge enhancement, light areas have lighter edges and dark areas have darker edges. This additional quality is often overlooked in existing research. Here we ask whether disruptive camouflage can have benefits above and beyond concealing location. Using a novel paradigm, we dissociate the time courses of localisation and identification of a target in a single experiment. We measured the display times required for a stimulus to be located or identified (the critical duration). Targets featured either uniform, disruptive or edge enhanced disruptive colouration. Critical durations were longer for identifying targets with edge enhanced disruptive colouration camouflage even when presented against a contrasting background, such that all target types were located equally quickly. For the first time, we establish empirically that disruptive camouflage not only conceals location, but also disguises identity. This shows that this form of camouflage can be useful even when animals are not hidden. Our findings offer insights into how edge enhanced disruptive colouration undermines visual perception by disrupting object recognition

Racehorses are getting faster

ArticleData used for analyses in this manuscript are available in Dryad: http://dx.doi.org/10.5061/dryad.qn82p.Copyright © 2015 The Author(s) Published by the Royal Society. All rights reserved.Previous studies have concluded that thoroughbred racehorse speed is improving very slowly, if at all, despite heritable variation for performance and putatively intensive selective breeding. This has led to the suggestion that racehorses have reached a selection limit. However, previous studies have been limited, focussing only on the winning times of a few elite races run over middle and long distances, and failing to account for potentially confounding factors. Using a much larger dataset covering the full range of race distances and accounting for variation in factors such as ground softness, we show that improvement is in fact on-going for the population as a whole, but driven largely by increasing speed in sprint races. In contrast, speed over middle and long distances, at least at the elite level, appears to be reaching an asymptote. Whether this reflects a selection limit to speed over middle and long distances or a shift in breeding practices to target sprint performances remains to be determined.BBSRC David Phillips Fellowshi

Trends and guidelines in online privacy policy

Online privacy policies (OPP) are important mechanisms for informing online consumers about the level of information privacy protection afforded when visiting web sites. To date, societal mechanisms and technologies have been the focus of attempts to improve the quality and effectiveness of OPPs. We present findings from a longitudinal, empirical study of online privacy policies. Our research found that although online privacy policies have improved in quality and effectiveness since 2000, they still fall well short of the level of privacy assurance desired by consumers. This study analyses trends in OPPs over the two years of the study, identifying areas of deficiency and improvements, and offering a solution in the form of a detailed set of guidelines for organisational online privacy policy. Our study adds to existing theory in this area and, more immediately, will assist businesses concerned about the effect of privacy issues on consumer web usage.<br /

Adding value to online privacy for consumers: remedying deficiences in online privacy policies with an holistic approach

We present findings from a longitudinal, empirical study of online privacy policies. Our research found that although online privacy policies have improved in quality and effectiveness since 2000, they still fall well short of the level of privacy assurance desired by consumers. This study has identified broad areas of deficiency in existing online privacy policies, and offers a solution in the form of an holistic framework for the development, factors and content of online privacy policies for organizations. Our study adds to existing theory in this area and, more immediately, will assist businesses concerned about the effect of privacy issues on consumer Web usage.<br /

Psychosocial Interventions in the Management of Severe Adolescent Obesity

Purpose: Psychosocial Interventions (PSI) are commonly utilised in mental health management, and to our knowledge, have not been explicitly used in weight management. PSI are characterised by three distinct phases: 1) an initial in-depth assessment; 2) an intensive group intervention to stabilise the condition (in this instance weight gain); and 3) an intensive group maintenance programme. PSI focus on the psychosocial elements of obesity, including: stress management, body dysmorphia and self-esteem. As such, the PSI approach is more holistic than traditional weight management approaches. This paper evaluated the outcomes of a PSI when delivered under service level conditions. Methods: SHINE (Self-Help, Independence, Nutrition, and Exercise) is a community-based weight management programme that implements a PSI approach. The programme is located in Sheffield, UK. Adolescents (n = 393) with severe obesity signed onto the programme between 2011 and 2013. The programme spans 12-15 months and participants attend three phases of the PSI. Phase One is undertaken before the programme, Phase Two is a 12-week intervention and Phase Three is split into three 12-week maintenance interventions. Anthropometric measurements (BMI and WC) were collected at baseline, 3-, 6-, 9- and 12-months. Psychosocial measures (self-esteem, anxiety and depression) were collected at baseline and 3-months. Participant retention was also assessed. Results: 304 participants started the programme and 289 were retained at 3 months. At 3 months BMI z-score reduced by 0.21 (95% CI: 0.19, 0.24) and WC by 7.8cm (95% CI: 7.2, 8.5). Almost 25% of participants reduced their BMI classification (e.g. severely obese to obese). Anxiety and self-esteem improved by 63% and 50% respectively. 89 participants continued to attend the programme after 12 months, obtaining a BMI z-score reduction of 0.46 (95% CI: 0.35, 0.58) and a WC reduction of 10.5cm (95% CI: 7.8, 13.1). Conclusions: Obesity is a highly complex condition to manage and requires intensive and prolonged support to produce meaningful and lasting behavioural and anthropometric changes. The SHINE PSI approach has shown promise and demonstrated encouraging results - suggesting that it may be beneficial for interventions to consider wider determinants of health and wellbeing beyond simply diet and physical activity

The estrogenic activity of phthalate esters in vitro

A large number of phthalate esters were screened for estrogenic activity using a recombinant yeast screen. a selection of these was also tested for mitogenic effect on estrogen-responsive human breast cancer cells. A small number of the commercially available phthalates tested showed extremely weak estrogenic activity. The relative potencies of these descended in the order butyl benzyl phthalate (BBP) > dibutyl phthalate (DBP) > diisobutyl phthalate (DIBP) > diethyl phthalate (DEP) > diisiononyl phthalate (DINP). Potencies ranged from approximately 1 x 10(6) to 5 x 10(7) times less than 17beta-estradiol. The phthalates that were estrogenic in the yeast screen were also mitogenic on the human breast cancer cells. Di(2-ethylhexyl) phthalate (DEHP) showed no estrogenic activity in these in vitro assays. A number of metabolites were tested, including mono-butyl phthalate, mono-benzyl phthalate, mono-ethylhexyl phthalate, mon-n-octyl phthalate; all were wound to be inactive. One of the phthalates, ditridecyl phthalate (DTDP), produced inconsistent results; one sample was weakly estrogenic, whereas another, obtained from a different source, was inactive. analysis by gel chromatography-mass spectometry showed that the preparation exhibiting estrogenic activity contained 0.5% of the ortho-isomer of bisphenol A. It is likely that the presence of this antioxidant in the phthalate standard was responsible for the generation of a dose-response curve--which was not observed with an alternative sample that had not been supplemented with o,p'-bisphenol A--in the yeast screen; hence, DTDP is probably not weakly estrogenic. The activities of simple mixtures of BBP, DBP, and 17beta-estradiol were assessed in the yeast screen. No synergism was observed, although the activities of the mixtures were approximately additive. In summary, a small number of phthalates are weakly estrogenic in vitro. No data has yet been published on whether these are also estrogenic in vitro. No data has yet been published on whether these are also estrogenic in vivo; this will require tests using different classes of vertebrates and different routes of exposure

Children\u27s ability to estimate the frequency of single and repeated events

Although it is extremely important when interviewing children about alleged abuse to determine whether the abuse was a single or a repeated occurrence, we have little information about how children judge the frequency of events. The aim of the current study was to examine children\u27s accuracy in providing estimates of event frequency that were numerical (that is, 1, 2, 3, . . .) and qualitative (that is, once, a few times, or many times). Younger (4- to 5-year-old) and older (6- to 8-year-old) children took part in a single event or an event that was repeated 6 or 11 times. They were interviewed after a short or long delay; some were interviewed a second time. Overall, children were very accurate at judging the frequency of a single event, but much less so for repeated events. Based on our findings, we make two recommendations for professionals trying to establish the frequency of events when interviewing young children.<br /