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听觉系统对不同频率的声音具有不同的灵敏度和分辨能力,作者们称之为频率选择性。正常耳和病耳的频率选择性有差异。耳频率选择性的研究在动物多采用电生理学方法,例如可以从单根神经纤维的电反应结果画出各纤维的调谐曲线(即听阈曲线)。但记录单位放电的方法很难直接应用于人体。文献中用多种心理物理学方法测得的人耳频率选择性有较多的差异,原因也不易说清楚。作者们建立了一套用镫骨肌反射来测定人耳频率选择性的方法,其原理和要点如下:给受试者一耳2000赫正弦信号刺激,其强度为反射阈上10分贝,时程为25秒,信号的上升和下降时
The auditory system has different sensitivities and resolving power to sounds of different frequencies, which the authors call frequency selective. There is a difference in frequency selectivity between normal and diseased ears. Ear Frequency Selectivity Studies In animals, electrophysiological methods are often used. For example, tuning curves for individual fibers (ie, hearing threshold curves) can be drawn from the electrical response of a single nerve fiber. However, the method of recording unit discharge is difficult to apply directly to the human body. There are many differences in the human ear frequency selectivity measured by various psychophysical methods in the literature, and the reasons are not easy to make clear. The authors established a method for determining the frequency selectivity of the human ear using the stapedius reflex. The principle and main points are as follows: The subject is stimulated with a 2000 Hz sinusoidal signal at an intensity of 10 dB above the reflection threshold with a duration of 25 seconds, the signal rises and falls