Lukashkin Andrei N, Russell Ian J
School of Biological Sciences, University of Sussex, Falmer, Brighton BN1 9QG, United Kingdom.
J Acoust Soc Am. 2003 Mar;113(3):1544-50. doi: 10.1121/1.1535941.
The mammalian cochlea is a structure comprising a number of components connected by elastic elements. A mechanical system of this kind is expected to have multiple normal modes of oscillation and associated resonances. The guinea pig cochlear mechanics was probed using distortion components generated in the cochlea close to the place of overlap between two tones presented simultaneously. Otoacoustic emissions at frequencies of the distortion components were recorded in the ear canal. The phase behavior of the emissions reveals the presence of a nonlinear resonance at a frequency about a half octave below that of the high-frequency primary tone. The location of the resonance is level dependent and the resonance shifts to lower frequencies with increasing stimulus intensity. This resonance is thought to be associated with the tectorial membrane. The resonance tends to minimize input to the cochlear receptor cells at frequencies below the high-frequency primary and increases the dynamic load to the stereocilia of the receptor cells at the primary frequency when the tectorial membrane and reticular lamina move in counterphase.
哺乳动物的耳蜗是一种由多个通过弹性元件相连的部件组成的结构。这样的机械系统预计具有多种正常振荡模式及相关共振。通过同时呈现的两个音调在耳蜗中靠近重叠位置处产生的失真成分来探测豚鼠的耳蜗力学。在耳道中记录失真成分频率处的耳声发射。发射的相位行为揭示了在比高频主音调频率低约半个八度的频率处存在非线性共振。共振的位置与声压级有关，并且随着刺激强度的增加，共振向更低频率移动。这种共振被认为与盖膜有关。当盖膜和网状板反向运动时，该共振倾向于使低于高频主音频率的输入最小化，并增加主频率下受体细胞静纤毛的动态负荷。
