Encoding of steady-state vowels in the auditory nerve: representation in terms of discharge rate.
Encoding of steady-state vowels in the auditory nerve: representation in terms of discharge rate.
复制标题
听觉神经中稳态元音的编码：以放电率表示。
DOI：
--
复制
发表时间：
1979
影响因子：
2.4
通讯作者：
E. Young
中科院分区：
文献类型：
--
作者：
M. Sachs;E. Young
在麻醉猫中记录了大量的神经纤维对合成稳态元音的反应。驱动放电率的元音，归一化除以饱和率（估计从驱动率CF音高于阈值50分贝），绘制了一些元音水平与纤维CF。对于元音/I/和/e/，这样的速率曲线在第一共振峰的区域中显示出峰值，并且在第二和第三共振峰的区域中显示出另一个峰值，对于低于约70 dB SPL的声音水平。对于在低于约40 dB SPL的电平处的/a/，在第一共振峰和第二共振峰的区域中存在峰值。在较高的水平上，由于速率饱和和双音抑制的结合，所有元音的这些峰值都会消失。这必须通过说明自发速率小于每秒一个尖峰的装置单独绘制的速率曲线可能在较高水平上保留峰值来进行限定。频率与电平函数的单位与CF以上的第一共振峰可以饱和率小于饱和率CF到es或他们可以是非单调的;这些影响是最有可能产生的机制相同，涉及在双音抑制。
Responses of large populations of auditory-nerve fibers to synthesized steady-state vowels were recorded in anesthetized cats. Driven discharge rate to vowels, normalized by dividing by saturation rate (estimated from the driven rate to CF tones 50 dB above threshold), was plotted versus fiber CF for a number of vowel levels. For the vowels /I/ and /e/, such rate profiles showed a peak in the region of the first formant and another in the region of the second and third formants, for sound levels below about 70 dB SPL. For /a/ at levels below about 40 dB SPL there are peaks in the region of the first and second formants. At higher levels these peaks disappear for all the vowels because of a combination of rate saturation and two-tone suppression. This must be qualified by saying that rate profiles plotted separately for units with spontaneous rates less than one spike per second may retain peaks at higher levels. Rate versus level functions for units with CFs above the first formant can saturate at rates less than the saturation rate to CF to-es or they can be nonmonotonic; these effects are most likely produced by the same mechanism as that involved in two-tone suppression.