Rossi G
ORL J Otorhinolaryngol Relat Spec. 1977;39(3):129-38. doi: 10.1159/000275347.
An automatic Grason-Stadler-Békésy 1701 audiometer with continuous frequency progression (1 octave/min) and increase (or attenuation)of intensity of 2.5 dB/sec, has been employed to perfect an investigation technique for obtaining, by the mean difference in dB between absolute bone conduction (ABC) and relative bone conduction(RBC), a quantity evaluation of stapes motility and monitor alterations brought on by various disease processes. A preliminary study performed on subjects with normal hearing was used to establish the influence of age on motility. It was thus possible to establish an index (stapes motility index, SMI) to represent the degree of normal stapes motility as a function of the subject's age and thus, through variations in this index, identify alterations to the motility of the tympano-ossicular system caused by ongoing disease processes and by surgery.
一台自动的Grason-Stadler-Békésy 1701听力计，具有连续频率递进（1倍频程/分钟）以及强度以2.5分贝/秒的速率增加（或衰减）的功能，已被用于完善一种研究技术，该技术通过绝对骨导（ABC）与相对骨导（RBC）之间的分贝平均差值，来对镫骨活动度进行定量评估，并监测各种疾病过程所引发的变化。对听力正常的受试者进行的初步研究用于确定年龄对活动度的影响。由此得以建立一个指数（镫骨活动指数，SMI），以表示正常镫骨活动度随受试者年龄变化的程度，进而通过该指数的变化，识别由现行疾病过程和手术导致的鼓室听骨链系统活动度改变。
