Basilar membrane responses to broadband stimuli
Basilar membrane responses to broadband stimuli
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DOI：
10.1121/1.1318898
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发表时间：
2000-11-01
影响因子：
2.4
通讯作者：
Rhode, WS
中科院分区：
文献类型：
--
作者：
Recio, A;Rhode, WS
在栗鼠耳蜗底的几个部位记录了基底膜(BM)对两种宽带刺激-短声刺激和施罗德相复合体的反应。记录部位(特征频率Cf，在5.5-18 kHz范围内)跨越基底膜1-4 mm的基底区。BM对点击的反应由瞬时频率的无衰减振荡组成，该频率随着时间的推移而增加，直到达到Cf附近的值。该滑行的时间常数与Cf有关。在整个研究区域，BM振动比Umbo运动高出60分贝。BM对点击的响应的非线性特性类似于在更多研究的8-10 kHz区域中发现的那些。施罗德相复刺激的幅度谱是平坦的，它由一系列正弦分量在负(-Schr)和正Schroeder相位(+Schr)中相加而成。BM对+Schr刺激反应的包络包含比对-Schr刺激反应更宽的谷或谷。因此，骨髓对前一种刺激的反应比对后一种刺激的反应更“尖峰”。线性耳蜗组的反应波形差异不明显。-Schr刺激对近CF音调的抑制大于+Schr刺激引起的抑制。(C)2000年美国声学学会。[S0001-4966(00)05411-4]。
Basilar membrane (BM) responses to two types of broadband stimuli-clicks and Schroeder-phase complexes-were recorded at several sites at the base of the chinchilla cochlea. Recording sites (characteristic frequency, CF, in the range of 5.5-18 kHz) span the 1-4-mm basal region of the basilar membrane. BM responses to clicks consisted of undamped oscillations with instantaneous frequency that increased over time until it reached a value around CF. The time constant of this glide is CF dependent. Throughout the entire region under study, BM vibration exceeded umbo motion by up to 60 dB. Nonlinear properties ties of BM responses to clicks resemble those found in the more studied 8-10-kHz region. Amplitude spectra of Schroeder-phase complex stimuli, which consist of a series of sinusoidal components summed in negative (-SCHR) and positive Schroeder phase (+SCHR), are flat. The envelope of BM responses to +SCHR stimuli contains valleys, or dips, that are wider than those found in responses to the -SCHR stimuli. Hence, BM responses to the former stimuli are "peakier" than responses to the latter. Differences in response waveforms are less obvious in linear cochleae. Suppression of a near-CF tone by -SCHR stimuli was larger than that evoked by +SCHR stimuli. (C) 2000 Acoustical Society of America. [S0001-4966(00)05411-4].