The missing-colour effect: The attentional beam captures reading-relevant and reading-irrelevant information

According to many models, reading is driven by an attentional beam. In two experiments, we investigated the specificity of the beam by testing its sensitivity to a reading-irrelevant feature: colour. More specifically, participants were asked to read either a black-and-white version or a multi-colour version of the text in which each letter was printed in a different colour. In addition, while reading for comprehension, participants either searched for a target letter ( t or d) or for a colour (pink or black). In Experiment 1, we used the Nelson–Denny reading test and in Experiment 2, we used an experimental text. In both the experiments, the typical missing-letter effect was observed with letters: Participants missed more letters in function than in content words. Most importantly, although the effect was smaller, this pattern of results was also observed when participants searched for a colour (e.g., pink or black letters in a multi-coloured passage). Our results suggest that the attentional beam involved in reading is sensitive to both reading-relevant and reading-irrelevant information.

Developmental Social Work in Disability Issues

(This is a full colour version.) In this ambitious book composed of the author’s published articles, he develops practical and theoretical frameworks for social work in disability issues. He explores practical strategies for promoting social and economic participation of disabled people from the perspective of developmental social work, whilst examining the situation of their socioeconomic participation in rural Sri Lanka. Based on these theoretical and practical frameworks, together with policy analysis of community-based rehabilitation (CBR), the field research was undertaken collaboratively with local stakeholders in three districts. The findings suggest that developmental social work practices, including an indigenous approach, social investment, and a multi-sectoral approach, could address the vicious cycle of inadequate education, poverty, and marginalisation. This book also explores the implications of these findings for policy and practice in other contexts.

The Craik—O'Brien—Cornsweet Illusion in Colour: Quantitative Characterisation and Comparison with Luminance

The strength of the Craik–O'Brien–Cornsweet illusion was measured for different values of spatial and temporal stimulus parameters, in the traditional achromatic version, and in an isoluminant colour version. It was found that the illusion is much weaker with isoluminant colour stimuli than with achromatic luminance stimuli. The illusion depends on the spatial parameters of the stimulus in a way that yields an approximate scale invariance: The strength of the illusion is similar for different stimulus sizes, as long as the ratio of the width of the transition region around the edge, where luminance or colour change, to the total stimulus width is preserved. In both the achromatic and the chromatic case, the strength of the illusion decreases with increasing presentation time. The similarity of the differences between brightness and colour effects on one hand and the differences in sensitivity for colour and luminance changes in humans on the other suggests that a lack of gradient detection underlies the Craik–O'Brien–Cornsweet illusion.