Fay R R, Ream T J
J Acoust Soc Am. 1986 Jun;79(6):1883-95. doi: 10.1121/1.393196.
The acoustic frequency selectivity of over 500 saccular nerve fibers of the goldfish was studied using automated threshold tracking based on spike rate increments defined statistically. Saccular fibers of the goldfish show great variation in (1) best sensitivity (-26 to + 35 dB re: 1 dyn/cm2), (2) best frequency (below 100 to 1770 Hz), (3) spontaneous rate (0 to over 200 spikes/s), (4) spontaneous type (silent, regular, irregular, burst), and (5) degree of tuning (Q 10 dB from less than 0.1 to 2). Saccular fibers may be grouped into four nonoverlapping categories based on tuning and best frequency: (1) untuned (less than 10-dB variation in sensitivity between 100 and 1000 Hz), (2) low frequency (BF from below 120 to 290 Hz), (3) midfrequency (BF between 330 and 670 Hz), and (4) high frequency (BF between 790 and 1770 Hz). Within each category, all spontaneous rates and types, and all degrees of tuning can be observed. The least sensitive fibers within each group have zero spontaneous rates. The goldfish is like all other vertebrates studied in that the peripheral auditory system is adapted for frequency selectivity throughout the animal's entire frequency range of hearing. Peripheral tuning most likely accounts for behavioral determinations of the "auditory filter" and for the detectability of signals masked by noise. The signal-to-noise ratio enhancement provided by these peripheral filters is likely to be of primary biological significance. A "place principle" of sound quality analysis based on lines "labeled" according to best frequency in the brain cannot be ruled out on the basis of the peripheral physiology.
利用基于统计学定义的峰值速率增量的自动阈值跟踪技术，对金鱼500多条球囊神经纤维的声频选择性进行了研究。金鱼的球囊纤维在以下方面表现出很大差异：（1）最佳灵敏度（相对于1达因/平方厘米为-26至+35分贝），（2）最佳频率（低于100至1770赫兹），（3）自发放电率（0至超过200次/秒），（4）自发放电类型（静息型、规则型、不规则型、爆发型），以及（5）调谐程度（10分贝带宽的品质因数Q从小于0.1至2）。根据调谐和最佳频率，球囊纤维可分为四个不重叠的类别：（1）非调谐型（100至1000赫兹之间灵敏度变化小于10分贝），（2）低频型（最佳频率低于120至290赫兹），（3）中频型（最佳频率在330至670赫兹之间），以及（4）高频型（最佳频率在790至1770赫兹之间）。在每个类别中，都可以观察到所有的自发放电率和类型，以及所有的调谐程度。每组中最不敏感的纤维自发放电率为零。金鱼与所有其他已研究的脊椎动物一样，其外周听觉系统在动物的整个听力频率范围内都适应频率选择性。外周调谐很可能是行为上确定“听觉滤波器”以及被噪声掩盖信号的可检测性的原因。这些外周滤波器提供的信噪比增强可能具有主要的生物学意义。基于大脑中根据最佳频率“标记”的线路进行音质分析的“部位原则”，不能根据外周生理学排除。
