MAGNITUDE AND PHASE-FREQUENCY RESPONSE TO SINGLE TONES IN THE AUDITORY-NERVE
MAGNITUDE AND PHASE-FREQUENCY RESPONSE TO SINGLE TONES IN THE AUDITORY-NERVE
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DOI：
10.1121/1.389575
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发表时间：
1983-01-01
影响因子：
2.4
通讯作者：
ALLEN, JB
中科院分区：
文献类型：
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作者：
ALLEN, JB
描述了从猫听神经的初级单一单位记录中获得的幅度和相位测量。声压级的范围从阈值到100分贝SPL[声压级]，频率从0.1-30.0千赫。相位测量的上限受到4-5 kHz的神经锁相丢失的限制。对于每个单元，用Kiang et Moxon(1978)的方法测量频率调谐曲线(FTC)，以建立单元的阈值频率响应。数据来自几个选定的动物，按特征频率(CF)组织，显示了每个CF范围的相位响应、群延迟、频率调谐和调谐斜率。主要侧重于数据的线性方面，其特征是单个单位响应的滤波特性；描述了一些非线性(水平相关)效应。提供的数据显示了由记录在圆窗膜上的耳蜗微音器(CM)归一化的相位响应。该归一化简化了相位数据，因为对于频率比其特征频率低1个八度以上的高CF单元(FCF>；1 kHz)，它产生相对于频率的恒定相位斜率(恒定群延迟)。提出了一个在圆窗(RW)处测量的CM模型，并与实验测量的CM进行了比较。CM模型对实验数据>；500赫兹进行了合理的拟合。CM归一化可以消除驾驶员和中耳效应。在该模型中，假设CM是由圆窗记录部位附近的基底膜移位产生的。
Magnitude and phase measurements obtained from primary single unit recordings in the cat auditory nerve are described. Levels range from threshold to 100 dB SPL [sound pressure level] with frequencies from 0.1-30.0 kHz. The upper limit on the phase measurements was limited by the loss of neural phase locking at 4-5 kHz. For each unit, the frequency tuning curve (FTC) was measured by the method of Kiang et Moxon (1978) to establish the threshold frequency response of the unit. Data from several selected animals, organized by characterized frequency (CF), are presented showing phase response, group delay, frequency tuning, and tuning slope for each CF range. The major emphasis is on the linear aspects of the data as characterized by the filter properties of the single unit response; a number of nonlinear (level-dependent) effects are described. Data are presented showing the phase response normalized by the cochlear microphonic (CM) recorded at the round window membrane. This normalization simplifies the phase data since it produces a constant phase slope with respect to frequency (constant group delay) for high CF units (fCF > 1 kHz) for frequencies more than 1 octave below their characteristic frequencies. A model of CM, as measured at the round window (RW), is presented and compared to experimental CM measurements. The CM model gives a reasonable fit to the experimental data > 500 Hz. The CM normalization may remove driver and middle ear effects. In the model CM is assumed to be generated by the displacement of the basilar membrane near the round window recording site.