Gerull G, Mrowinski D, Janssen T, Anft D
E.N.T. Clinic Charlottenburg, Free University of Berlin, Germany.
Scand Audiol. 1987;16(4):227-35. doi: 10.3109/01050398709074945.
Click polarity has little influence on brainstem potentials. We applied an auditory stimulus similar to a step function generated in a closed acoustic system. The influence of stimulus onset steepness (comprising rise time and intensity) on wave V latency and amplitude was investigated. A remarkable latency prolongation was observed for condensation (C) compared with rarefaction (R), if a sharp bend at the foot of the slope was avoided. The C latency lag was nearly the amount of rise time. The effect can be explained by cochlear travel time. Wave V amplitude for R slopes was significantly enhanced. At high intensity and short rise time, it reached twice the values found with C slopes, or with clicks of either polarity. Although the explanations found are not yet satisfactory, a clinical application in cochlear diagnosis is predictable.
点击极性对脑干电位影响很小。我们应用了一种类似于在封闭声学系统中产生的阶跃函数的听觉刺激。研究了刺激起始陡度（包括上升时间和强度）对V波潜伏期和振幅的影响。如果避免斜坡底部出现急剧弯曲，与疏波（R）相比，密波（C）可观察到明显的潜伏期延长。C波潜伏期延迟几乎与上升时间的量相同。这种效应可以用耳蜗传播时间来解释。R波斜率的V波振幅显著增强。在高强度和短上升时间时，其值达到C波斜率或任何一种极性点击时所发现值的两倍。尽管所找到的解释尚不令人满意，但在耳蜗诊断中的临床应用是可预见的。
