Békésy Audiometry in Patients with Cerebral Apoplexy

Bekesy audiometric findings of 50 apoplectic patients were reported. For the analysis of the findings, 50 patients were grouped according to Jerger's criteria. But type I and type II were subgrouped into type Ia, Ib and type IIa, IIb respectively, according to the width of the tracing. Type Ia showed normal width of the tracing, and type Ib showed the wide tracing more than 15dB, but type IIa showed the narrow tracing less than 5dB and type IIb the wide tracing more than 5dB.The results were as follows:1) Sixty percent of the apoplectic patients showed Type I, in which half showed abnormally increased tracing width.2) Type II was found in 25%, in which recruitment was seen in 3%. Type III and Type IV were found in 6%.3) In cases showing the abnormally increased tracing width, I. Q., as one of the cerebral cortical factors, showed no definite correlation between normal and increased tracing width groups.4) The cases showing the increased tracing width were more frequent in the lesions of right cerebral hemisphere, and it can be anticipated that dominancy of the cerebral hemisphere is contributed to the reception of a pure tone.