| 摘要 |
PROBLEM TO BE SOLVED: To prevent eyeball electric voltage from being mixed without indicating the same visual point by a method wherein finishing time point of the eyeball electric voltage based on winking of the eyeball is detected and induced stimulation in a brain is generated at a time point where provability for generating the next winking becomes min. from the finishing time point. SOLUTION: A plurality of electrodes 2 mounted on the head part of a subject 1 are connected with an electroencephalograph 4 through a connector 3 and a buzzer 5 is connected with the electroencephalograph 4. In measuring brain wave, by receiving an induced stimulation in brain for the subject 1, the electroencephalograph 4 inputs a brain wave signal from the electrodes and converts the brain wave signal to a digital signal. In addition, the level value of the brain wave converted to digital data is compared with the threshold limiting value of winking and when the brain wave level is larger than the threshold limiting value of winking, a driving signal is given to the buzzer 5 by the electroencephalograph 4 to ring the buzzer 5 for a definite period. In this case, the driving signal is generated in such a way that it is deviated by a time interval from finishing point of winking to the time point minimizing probability of generation of the next winking. |
