Study for making standard of embossed dotted graphics for braille users

2017 Fiscal Year Final Research Report

• Project/Area Number: 25780539
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Special needs education
• Research Institution: University of Tsukuba
• Principal Investigator: MORI MAYU 筑波大学, 人間系, 助教 (20634893)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: 点図 / 線 / 識別容易性 / 点間隔 / 基準

Outline of Final Research Achievements

In the embossed dotted diagrams expressing the element at the embossed dots, the condition of the distance between dots perceived as "line" from the user using Braille was examined experimentally. The longest distance between dots recognized as a solid line was 3.47 mm (SD = 0.56), and the shortest distance between dots recognized as a dotted line was 4.21 mm (SD = 0.71). Also, the limit of the distance between dots perceived as line was 8.15 mm (SD = 2.25). Considering the range of the average value ± 1 standard deviation as the reference, it was proposed to use lines with distance between dots roughly 2.9 mm or more. Dotted line’s distance between dots were proposed roughly 4.9 mm to 5.9 mm. And it is better not to use distance between dots roughly 8.2 mm or more . In addition, due to the difference in the time required for tasks depending on the number of lines, previous researches and editing materials of Japanese Braille textbooks were backed up.

Free Research Field

視覚障害教育