Palva T, Palva A, Kärjä J
Acta Otolaryngol. 1975 May-Jun;79(5-6):384-9. doi: 10.3109/00016487509124701.
A midline loudness balance test was made in 10 normal ears with blocked ear canals and in 104 conductively deaf ears with loss not exceeding 45 dB. The test was made by giving the tones simultaneously in the ears at 10, 60 and 80 dB sensation levels for 500 and 2 000 Hz. In the normal group the midline balance method indicated no reduction from the threshold differences at any of the three levels whereas significant reductions occurred in all groups of conduction deafness. The occurrence of true partial recruitment in conduction deafness demonstrated by ABLB (Fowler's) test was attributed to altered middle ear mechanics, loud tones stimulating the inner ear relatively more effectively than tones near the threshold level. The midline balance method is more closely dependent upon bone conducted sounds and on the altered relative movements of the labyrinthine windows.
对10只耳道堵塞的正常耳朵和104只听力损失不超过45分贝的传导性聋耳朵进行了中线响度平衡测试。测试方法是在500赫兹和2000赫兹频率下，分别以10分贝、60分贝和80分贝的感觉级同时向双耳施加纯音。在正常组中，中线平衡法显示在三个测试水平上，双耳阈值差均无减小；而在所有传导性聋组中，双耳阈值差均显著减小。ABLB（福勒氏）测试证实，传导性聋中确实存在部分重振现象，这归因于中耳力学改变，即高强度纯音对内耳的刺激相对比阈值附近纯音更有效。中线平衡法更依赖骨导声音以及内耳窗相对运动的改变。
