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正常人声反射阈在70～90dB,用肌电图和用耳蜗微音电位分别在50 dB HL和30～40 dB HL可引出实验动物的中耳肌收缩。本文报告将信号平均技术用于声反射的研究。用持续时间为400毫秒、上升时间为10毫秒、刺激间隔为600毫秒的短纯音串(频率为500,1000,2000及4000Hz,强度为110～0dBHL,在110～80dBHL间每2dB一档,80～0dB HL间每10dB一档)。由对侧刺激引出声反射。用220 Hz代替660Hz测试纯音,以便将纯音与刺激音分开,避免假性反射伪迹。共测试鼓室功能曲线为A型的30例(50耳)。其中10例(20耳)属正常者;10例(20耳)为有重振的双侧感音神经性聋者(听阈在35～90dBHL之间);10例单侧耳硬化症患者作了成功的镫骨切除术,于术后3个月进行测试(听阈在5～30dBHL)。
Normal human reflex threshold 70 ~ 90dB, EMG and cochlear microphones were 50 dB HL and 30 ~ 40 dB HL can lead to experimental animals in the contraction of the middle ear muscle. This article reports the use of signal averaging techniques for acoustic reflections. With a duration of 400 milliseconds, the rise time of 10 milliseconds, stimulation interval of 600 milliseconds of pure pure tone string (frequency of 500,1000,2000 and 4000Hz, the intensity of 110 ~ 0dBHL, between 110 ~ 80dBHL every 2dB a file, 80 ~ 0dB HL every 10dB a file). Acoustic reflex by contralateral stimulation. Test pure tone at 220 Hz instead of 660 Hz to separate pure tone from stimulus tone and avoid false reflection artifacts. A total of 30 cases (50 ears) of Tympanum function curve were tested. Among them, 10 (20 ears) were normal; 10 (20 ears) were those with bilateral sensory deafness whose hearing threshold was between 35-90 dBHL; 10 patients with unilateral otosclerosis Of the stapes resection, in 3 months after the test (threshold at 5 ~ 30dBHL).