Pages 71-76
We have been studying how to stimulate a fingertip in order to improve our tactile aid for the deaf. In previous study, we have designed new stimulation method that stimuli of consonant or vowel part of speech were presented with vibratory or convex stimulation pattern. In this study, we have proposed the usage of mixture of vibration and convex stimulation pattern in order to diminish tactile fatigue of the fingertip. From the experimental result, the degree of tactile fatigue decreased when stimuli were made by mixture of vibration and convex. Moreover, the consonant identification rate became higher when the duty ratio of vibration was changed. The reason was guessed to be different tactile sensation caused by different duty ratio.
