抄録
The aim of this research is to develop a human-computer interface system for quadriplegic patients. In this study, we developed a two-channel human-computer interface system for inputting characters of the Japanese language using mandibular and tongue movement. The interface consists of a polymer mouthpiece and a slide potentiometer. Operation involves the user looking at character patterns displayed on a PC screen and selecting elements by making a 'biting' movement with the upper and lower incisors. The final selection of a character element is made by pushing a switch with the tip of the tongue. The display is a two-dimensional matrix composed of 50 syllables of the Japanese alphabet, as well some symbols used in writing. The operator first selects the line of the character element, and then the column corresponding to the element of choice. The illumination of a pilot lamp provides the user with a visual means of confirming the exact position of the character element selected. The time taken for the whole operation was recorded. Two subjects carried out the experiments over a period of three days. It was possible to input Japanese syllables in about 4 s.
