Relationship between Input Methods and the Influence of the Height of Tactile Dots on Input Performance when Operating Cellular Phones

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  • 操作の仕方と凸点の高さが携帯電話の操作性に及ぼす影響の関係

Abstract

<p>In 2000, Japanese Standards Association standardized tactile dots and bars on consumer products for all people, including older people and people with disabilities. However, the numerical values for the size of tactile dots and bars were not determined on the basis of reliable data. The purpose of this study is to evaluate the relationship between input methods (the two-handed forefinger input and the one-handed thumb input) and the influence of the height of tactile dots (i.e., 0.0, 0.1, 0.3, 0.5, and 0.7 mm) on input performance when operating cellular phones. To analyze the influence of the height of tactile dots for each input method, we compared the results for the two-handed forefinger method from this study and that for the one-handed thumb method from our previous study. Normal sighted young and old participants, whose hands were covered by a curtain, operated cellular phones with a tactile dot on key 5 and other phones without a tactile dot. They operated the numerical keypad with the forefinger or the thumb while looking at 50 randomly ordered Arabic numbers one at a time. As a result of the experiments, both group of participants performed better with a tactile dot, rather than without it, using each input method, and they could operate more accurately and quickly especially in the case of a 0.3 mm high dot. On the other hand, by using the one-handed thumb method, the input performance deteriorated when the tactile dot was higher than 0.3 mm. However, by using the two-handed forefinger method, the input performance did not deteriorate as the height of the tactile dot was increased. This result was attributed to the differences in operating characteristics between one-handed and two-handed input methods.</p>

Journal

  • Biomechanisms

    Biomechanisms 21 (0), 103-112, 2012

    Society of Biomechanisms

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