Stephan K, Welzl-Müller K, Stiglbrunner H
Clinic for Hearing, Speech and Voice Disorders, University of Innsbruck, Austria.
Scand Audiol. 1990;19(2):111-5. doi: 10.3109/01050399009070761.
The dynamic range of the contralateral Stapedius reflex elicited by analog electrostimulation via cochlear implant was investigated in 8 subjects supplied with a Vienna prosthesis. The study comprised patients fitted with intracochlear devices as well as patients with extracochlear devices. Sinusoidal bursts of 125, 500, 1,000 and 2,000 Hz were used as stimulation signals. Only in one patient was saturation of reflex amplitude observed. The dynamic range of the Stapedius reflex was defined either by the difference in stimulus level for reflex saturation or individual uncomfortable loudness level and reflex threshold. Two different methods were used, yielding values between 0.1 and 12 dB, with a median of 4 dB. The individual results were compared with individual psychoacoustic quantities, i.e. subjective dynamic range (difference between sensation threshold and uncomfortable loudness level) and residual dynamic range (difference between most comfortable loudness level and uncomfortable loudness level). The reflex dynamic range is located within the residual dynamic range of electrostimulation. Thus the Stapedius reflex dynamic range can be applied as a rough estimate of minimum residual dynamic range.
对8名植入维也纳人工耳蜗的受试者，研究了通过人工耳蜗进行模拟电刺激诱发的对侧镫骨肌反射的动态范围。该研究包括植入耳蜗内装置的患者以及植入耳蜗外装置的患者。使用125、500、1000和2000Hz的正弦脉冲作为刺激信号。仅在一名患者中观察到反射幅度饱和。镫骨肌反射的动态范围由反射饱和的刺激水平差异或个体不适响度水平与反射阈值来定义。使用了两种不同的方法，得出的值在0.1至12dB之间，中位数为4dB。将个体结果与个体心理声学量进行比较，即主观动态范围（感觉阈值与不适响度水平之间的差异）和残余动态范围（最舒适响度水平与不适响度水平之间的差异）。反射动态范围位于电刺激的残余动态范围内。因此，镫骨肌反射动态范围可作为最小残余动态范围的粗略估计。
