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The way in which children who have visual impairments construct cognitive maps of their environment is of considerable theoretical and practical importance. It sheds light on the role of sensory experience in the development of spatial cognition which can in turn suggest how spatial skills might be nurtured in visually impaired children. In most of the(More)
Mental rotation tasks have been used to probe the mental imagery both of sighted and of visually impaired people. People who have been blind since birth display a response pattern which is qualitatively similar to that of sighted people but tend to respond more slowly or with a higher error rate. It has been suggested that visually impaired people code the(More)
Normal human mesothelial cells from individual donors were studied for susceptibility to asbestos-induction of apoptosis and generation of an extended lifespan population. Such populations were generated after death of the majority of cells and arose from a subset of mesothelial cultures (4/16) whereas fibroblastic cells (5/5) did not develop extended(More)
OBJECTIVE Our goal was to determine the optimal elevation of tactile map symbols. BACKGROUND Tactile perception research predicts that symbol elevation (vertical height) and texture on tactile maps could influence their readability. However, although research has shown that elevation influences detection and discrimination thresholds for single tactile(More)
Tactile maps and diagrams need to be carefully designed in order to be readable by the visually impaired user. In the Tactile Inkjet Mapping Project, we attempt to provide a new orientation for tactile map design through a rigorous programme of experimental research on design issues (cognitive tactualisation approach). In this paper, we discuss three of our(More)
The tribe Massonieae Baker (Hyacinthaceae-Hyacinthoideae) presently consists of about 19 genera and 230 species distributed from Africa (south of the Sahara) to Madagascar and India. Based on atpB and trnL-F DNA sequences the tribe is monophyletic only when the genus Pseudoprospero is excluded from Massonieae. In most trnL-F trees, this genus occupies a(More)
Prior analysis of 20 human mesothelioma cell lines for p53 status revealed only two mutations and one p53 null cell line, although p53 expression was detected in most cell lines. In addition, mRNA and protein expression of the retinoblastoma gene product in human mesothelioma cell lines is similar to normal controls. We have tested for p53 induction after(More)
This study deals with the suitability of substrates for tactile maps and diagrams for visually impaired people. Visually impaired and sighted participants scanned symbol arrays by touch on 7 different substrates, including papers, plastics and aluminium. In general, papers were rougher than plastics and aluminium. Search time and participants' preferences(More)