Takagi N, Suzuki T, Kobayashi K
Scand Audiol. 1985;14(2):75-9. doi: 10.3109/01050398509045926.
By means of digital filtering, averaged auditory brain-stem responses (ABR) were divided into slow and fast components with frequency compositions of 50-300 Hz and 400-1 500 Hz, respectively, and the relation of the two components to stimulus frequency was investigated. Tone bursts with a rise-decay time of two periods of the chosen frequency with no plateau (2-0-2) and with a 4 ms rise-decay time with no plateau (8 ms duration) were used as acoustic stimuli. Tone-burst frequencies were 0.5, 1, 2, 4 and 8 kHz at an intensity level of 40 dB nHL. The amplitude ratio of wave V of the fast component to the slow component decreased with decreasing stimulus frequency, and it remained almost unchanged at each stimulus frequency regardless of the rise-decay time of the stimuli. From these results, it became clear that the frequently-mentioned audiometric difficulties for lower frequency stimuli in ABR testing are related mainly to the low amplitude of the fast component for the frequency range below 1.0 kHz. The slow component, with relatively large amplitude for the low-frequency stimuli, is regarded as the most useful index in the ABR for threshold estimation of hearing.
通过数字滤波，将平均听觉脑干反应（ABR）分为慢成分和快成分，其频率成分分别为50 - 300Hz和400 - 1500Hz，并研究了这两个成分与刺激频率的关系。选用上升-下降时间为所选频率两个周期且无平台期（2 - 0 - 2）以及上升-下降时间为4ms且无平台期（持续时间8ms）的短纯音作为声刺激。短纯音频率为0.5、1、2、4和8kHz，强度为40dB nHL。快成分的V波与慢成分的幅度比随刺激频率降低而减小，并且在每个刺激频率下，无论刺激的上升-下降时间如何，该比值几乎保持不变。从这些结果可以清楚地看出，ABR测试中低频刺激常提到的听力测定困难主要与1.0kHz以下频率范围内快成分的低幅度有关。对于低频刺激具有相对较大幅度的慢成分，被认为是ABR中用于听力阈值估计的最有用指标。
