Abstract
When the MES was operated, various degrees of temporal and permanent hearing losses occurred. The effects upon hearing of the total ablation of the MES on one side were not equal to those on the other side and either of them was dominant. It seems that the unilateral dominance rested on which side the shock had been given during the training and the dominant part was the MES contralateral to the charged limb. The total ablation of the non-dominant MES caused in same cases no loss of hearing at all, or if it did the loss was temporary and very small, while that of the dominant MES caused slight but permanent hearing loss. The hearing loss caused, however, by the total ablation of both MES did not exceed the loss caused by the total ablation of the dominant MES.
These results should be interpreted as a guidepost for further reserch rather than a fully documented conclusion.
I am greatly indebted to Prof. S. Kawata for his advice and help in carrying out this work.
