Hedgehogs are not colour blind

We exhibit a family of $3$-uniform hypergraphs with the property that their $2$-colour Ramsey numbers grow polynomially in the number of vertices, while their $4$-colour Ramsey numbers grow exponentially. This is the first example of a class of hypergraphs whose Ramsey numbers show a strong dependence on the number of colours.Comment: 7 page

Colour naming by colour blind children

We cornpared 30 colour-blind boys to 29 colour-normal boys matched for age (5-9 years) on a colour narning task. The stimuli were good exarnples of Berlin & Kay 's (1969) universal colour categories presented under relatively natural viewing conditions. The colour-blind boys made less than halfthe narning errors predicted by the standard model of colourvision; narning of primary categories (white, red, green, yellow and blue) was almost normal, while their narning of brown, grey and purple was least accurate. It seerns that the phenornenal world of the colour-blind is not as different frorn ours as the standard theory predicts, and that the advicegiven to the newly diagnosed colour-blind and their parents needs tempering. The colour-blind however, probably rely more than colour-nonnals on lightness and saturation differences for colour discrirnination and naming, and this suggests that their achievernent of their limited level of naming cornpetence will be delayed relative to colour- normals.30 niños daltónicos y 29 controles de edades similares (5-9 años) fueron cornparados en una tareu de denominación de colores en la que se emplearon prototipos de las categorías universales consideradas por la teoria de Berlín y Kay (1969) y condiciones cotidianas de observación. Los daltónicos tuvieron menos errores que los previstos a partir de los modelos convencionales de la visión del color. En concreto, sus denominaciones de los estirnulos pertenecientes a las categorías prirnarias (blanco, rojo, verde, amarillo y azul) fueron muy similares a las de los controles, aun y cuando tuvieron más errores que éstos ante los estímuloscorrespondientes a las categorías de marrón, verde y morado. El conjunto de resultados obsevado parece implicar que el mundo fenoménico de los daltónicos no es tan diferente del cornún como se predice desde las teorías convencionales, lo que no debe olvidarse cuando se proporciona un diagnóstico de daltonismo al niño afectado y a sus padres. Por otra parte,es muy probable que los daltónicos dependan más que los comunes de las diferencias en claridad y saturación cuando efectúan denominaciones y discriminaciones de color. Este hecho puede estar relacionado con sus limitaciones cotidianas para denominar colores

It's time designing for the colour blind became a more integrated component of academic and media training

Despite affecting one in 12 men and one in 200 women, colour blindness rarely features in discussions around access and inclusivity. Oliver Daddow explains how his preferred research methodology has been informed by his colour blindness, but also reveals the frustration he has felt since joining Twitter earlier this year. A variety of data representations are increasingly shared via social media, yet many are indecipherable to those with colour blindness. Bad graphic design prevents significant numbers of people from engaging with certain work because it limits access to the data. Generally, elements favourable for colour blind users are actually considered good design practice in a wider sense. Designing for colour blind users should help make your work more accessible to all users

Is there any justice in being other than 'white' in Britain?

Over the past five years numerous headlines have deconstructed racism as a political event. There is no escape from the politics of these events in the media; for example, Racism on the Rise in Britain’ (Guardian, 2014); Immigrants make UK racist (The Independent, 2014); Cameron to hold football racism summit (Sunday Times, 2012); and, You can't ignore racism and raise anti-racist children (Guardian, 2015). Following Prime Minister John Major’s political rhetoric calling for policy [to] be colour blind (1997:7) and Blair’s commitment in the 1990s to address race inequities in schools (DfEE, 1997) there is a need for fresh thinking. Especially since behind such political rhetoric there was only superficial support to challenge racism (Gillborn, 2009). Indeed, on a wider horizon, despite education permeating the warp and weft of Western societies, the politics of ‘White supremacy’ (more commonly identified as racism) is so ingrained in institutional and political structures in the UK (Taylor, 2009), its grounding assumptions remain largely ignored

A framework for accessible m-government implementation

The great popularity and rapid diffusion of mobile technologies at worldwide level has also been recognised by the public sector, leading to the creation of m-government. A major challenge for m-government is accessibility – the provision of an equal service to all citizens irrespective of their psychical, mental or technical capabilities. This paper sketches the profiles of six citizen groups: Visually Impaired, Hearing Impaired, Motor Impaired, Speech Impaired, Cognitive Impaired and Elderly. M-government examples that target the aforementioned groups are discussed and a framework for accessible m-government implementation with reference to the W3C Mobile Web Best Practices is proposed

Detection of secretory IgA antibodies against gliadin and human tissue transglutaminase in stool to screen for coeliac disease in children: validation study

Objective To evaluate two commercial stool tests for detection of secretory IgA antibodies against gliadin and human tissue transglutaminase for diagnosis of coeliac disease in children with symptoms.Setting Tertiary care children's hospital.Participants Coded stool samples from 20 children with newly diagnosed coeliac disease and 64 controls. Six children with coeliac disease had stool tests every two weeks for three months after starting a gluten-free diet.Main outcome measures Secretory IgA antibodies against gliadin and human tissue transglutaminase in stool samples, determined in duplicate by using recommended cut-off limits.Results Sensitivity of faecal antibodies against human tissue transglutaminase was 10% (95% confidence interval 1% to 32%), and specificity was 98% (91% to 100%). For antibodies against gliadin, sensitivity was 6% (0% to 29%) and specificity was 97% (89% to 100%). Optimisation of cut-off limits by receiver operating characteristic analysis and use of results of both tests increased sensitivity to 82%, but specificity decreased to 58%. All follow-up stool tests remained negative, except for two positive anti-gliadin results in one patient, six and 10 weeks after the gluten-free diet was started.Conclusions Neither stool test was suitable for screening for coeliac disease in children with symptoms