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Fujimoto, H., Doi, K., Wada, T.
Influence of Tactile-Symbol Size on Discriminbility and Dot Distance on
Perception of Dot-Pattern Texture for Tactile Guide Maps
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Keywords: Tactile guide map, Tactile symbol, Dot-texture, Display methods
of tactile guide maps
Recently in Japan, many Braille signs and tactile guide maps have been
installed at various public facilities. However, because many printing
companies insufficiently knowledgeable about Braille signs and tactile
guide maps have entered this field, many unsatisfactory products have
appeared. It has been pointed out that tactile symbols among different
printing companies are unequal in shape and size, and that relation between
perception of dot-pattern texture and dot distance does not become clear.
It is hoped that several basic studies of tactile symbols and texture for
tactile guide maps will be conducted to discover optimal display methods of
tactile guide maps. In this study, we conducted two basic experiments. The
first experiment investigated the influence of three normal tactile symbols
(circle, triangle and square) size on discriminability. From the results, we
found the relation between discrimination time and size of each tactile
symbol. The second experiment examined useful dot-pattern texture for
tactile guide maps. It was found that perception of dot-pattern texture
correlates directly with the dot distance.
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