Identification rates of tactile symbols and letters

How to use this database

Outline

This database presents correct identification rates for tactile symbols and letters, separately for groups with different properties, in graphical form.

Parameters

(A) Type of tactile symbols and letters: Select one from "Symbols", "Numerals", or "Kata-kana".
(B) Size of symbols or letters: Input the size in integers in millimeters. Size stands for the side length of the square that embraces a single symbol or letter.

About this database

This database presents correct identification rates of tactile symbols and letters. The rates were obtained in experiments in which 33 young adults aged 18–42 years (mean, 23 years) and 33 older adults aged 60–73 years (mean, 67 years) with normal vision for their age and 73 visually impaired persons aged 23–76 years participated. They were asked to identify tactile symbols and letters by touching with their index finger, without looking at them.

Details of the measurement method are described in Reference [1].

References

[1] Doi, K., Fujimoto, H., Wada, T., Sagawa, K. and Itoh, N., "Perceptibility of tactile symbols and tactile characters," Biomechanisms 21, 81-92 (2012, in Japanese).