Krukowski B, Carlborg B, Densert O
Hear Res. 1980 Jun;2(3-4):207-12. doi: 10.1016/0378-5955(80)90058-1.
The perilymphatic pressure was studied in response to various low frequency pressure changes in the ear canal. The pressure transfer was analysed and found to be nonlinear in many aspects. The pressure response was found to contain two time constants representing the inner ear pressure regulating mechanisms. The time constants showed an asymmetry in response to positive and negative going inputs--the effects to some extent proportional to input levels. Further nonlinearities were found when infrasonic sine waves were applied to the ear. Harmonic distortion and modulation appeared. When short bursts of infrasound were introduced a clear d.c. shift was observed as a consequence of an asymmetry in the response to positive and negative going pressure inputs. A temporary change in mean perilymphatic pressure was thus achieved and continued throughout the duration of the signal. At very low frequencies a distinct phase shift was detected in the sine waves. This appeared as a phase lead, breaking the continuity of the output sine wave.
研究了外耳道内各种低频压力变化对外淋巴压力的影响。分析了压力传递情况，发现其在许多方面是非线性的。发现压力响应包含两个时间常数，代表内耳压力调节机制。这两个时间常数在对正向和负向输入的响应中表现出不对称性——其影响在一定程度上与输入水平成正比。当向耳朵施加次声正弦波时，发现了进一步的非线性现象。出现了谐波失真和调制。当引入短脉冲次声时，由于对正向和负向压力输入的响应不对称，观察到明显的直流偏移。因此，外淋巴平均压力出现了暂时变化，并在信号持续期间一直持续。在非常低的频率下，在正弦波中检测到明显的相移。这表现为相位超前，破坏了输出正弦波的连续性。
