Abstract
Electrical discharges of some of the face muscles (orbicularis oris, levator labii sup., procerus) during pronounciation (a, i, u, e, o; Sa, Si, Su, Se, So) were measured in normal and cleft palate persons.
In this experiment silver surface electrodes, condenser-coupled amplifier and electromagnetic oscillograph were used.
The results were as follows;
1. In normal cases, electrical discharges of these face muscles were weak or not found. In most cases these weak discharges were only found immediately before the waves of voice recorded simultaneously.
2. In cleft palate patients, these electrical discharges were more remarkable than in cases of normal persons and these were recognized not only immediately before the occurrence of waves of the voice, but also showed the afterdischarges.
3. The electrical discharges of the procerus muscle were not recognized in both normal and cleft palate persons.
4. There were no relations between the degrees of the electrical discharges of these face muscles during pronounciation and the form of the cleft palate.
