Fiałkowska M D, Janczewski G, Kochanek K, Dawidowicz J
Scand Audiol. 1983;12(4):295-8. doi: 10.3109/01050398309044433.
ECoG and ABR recordings were performed on 22 young, normal-hearing persons, before and after exposure to fatiguing noise. Temporary Threshold Shift (TTS) of up to 35 dB at 4-6 kHz was induced by octave band noise with centre frequency at 2.8 kHz. The latency of waves I, III, V and ACAP (Auditory Compound Action Potential) and intervals between waves I-III, III-V, I-V and ACAP-V were analysed as functions of stimulus intensity in pre- and post-exposure recordings. In post-exposure recordings a threshold elevation, a significant increase of latency and unaltered intervals between the successive waves and ACAP were observed. It was concluded that the noise-induced auditory fatigue, measured as TTS, originates within the cochlea and is transferred to the auditory pathways. The great intersubject variability of the data obtained indicates that the TTS may be a useful measure of individual sensitivity to noise, but prognosis on the presumed Permanent Threshold Shifts (PTS) based on the evaluation of TTS would seem doubtful.
在22名听力正常的年轻人接触疲劳噪声前后，进行了脑电图（ECoG）和听性脑干反应（ABR）记录。中心频率为2.8kHz的倍频程带噪声在4-6kHz处诱发了高达35dB的暂时性阈移（TTS）。在暴露前和暴露后的记录中，分析了波I、III、V和听性复合动作电位（ACAP）的潜伏期以及波I-III、III-V、I-V和ACAP-V之间的间隔与刺激强度的关系。在暴露后的记录中，观察到阈值升高、潜伏期显著增加以及连续波和ACAP之间的间隔未改变。得出的结论是，以TTS衡量的噪声性听觉疲劳起源于耳蜗，并传递到听觉通路。所获得数据的个体间差异很大，这表明TTS可能是个体对噪声敏感性的一种有用测量方法，但基于TTS评估对假定的永久性阈移（PTS）进行预后似乎值得怀疑。
