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缩短脑干电反应测听的时间,可通过减小信噪比以降低叠加次数和增加刺激的重复频率二种方法来实现,但后者将导致适应,使反应的振幅变小,潜伏期延长。潜伏期的变化是一项诊断依据,因此了解刺激的重复频率对听径路不同水平反应波的潜伏期的影响有重要意义。目前这一问题的研究结果尚不一致。本文分析了10例听力正常人的脑干电反应,测验分别采用每秒2.5,5,10,20,40和80次70分贝的刺激。观察到当刺激频率增加时,N_2～N_4波的振幅均变小,而N_5波的振幅几乎不受影响。小于每秒10次时的刺激频率并不影响N_2～N_5
Shortening the time of auditory brainstem response can be achieved by reducing the signal-to-noise ratio to reduce the number of superimpositions and increase the repetition frequency of stimuli. However, the latter will lead to adaptation, which results in smaller amplitude and longer latency. Changes in latency is a diagnostic basis, so to understand the stimulation of the repetitive frequency of different levels of auditory trail response to the impact of latency is of great significance. The current research on the issue is not consistent. In this paper, we analyzed the brainstem response in 10 normal hearing subjects. The stimuli were stimulated at 2.5, 5, 10, 20, 40 and 80 times per second, respectively. It was observed that when the stimulation frequency increased, the amplitude of N_2 ~ N_4 wave became smaller, while the amplitude of N_5 wave was almost unaffected. Stimulation frequency less than 10 times per second did not affect N_2 ~ N_5