Abstract
This paper deals with vibrotactile stimuli that are suitable as reading aid for the blind. The functional properties of vibratory sense of skin were studied for a blind aid by means of psycho-physical experiments with respect to the two-point threshold. In order to observe vibrotactile stimulus by using both the electrical and mechanical stimuli, the subjects were provided with Ag-AgCl electrodes at two points on their finger.
The two-point threshold by using both the electrical and mechanical stimuli changed to a smaller value by 0.5 mm at 200 Hz compared to that stimulated only by the mechanical stimulus.
Furthermore in the experiment the two-point threshold of each finger was measured by using both the electrical and mechanical stimuli.
