Huffman R F, Henson O W
University of North Carolina, Department of Cell Biology and Anatomy, Chapel Hill 27599.
Hear Res. 1991 Nov;56(1-2):79-85. doi: 10.1016/0378-5955(91)90156-4.
The ear of the mustached bat (Pteronotus parnellii) shows marked cochlear resonance near 60 kHz and many sharply tuned neurons throughout the brain have best frequencies (BF) near the cochlear resonance frequency (CRF). Controlled changes in the normal physiological range of body temperature (approx 37-42 degrees C) were used to change the CRF and to study the tuning properties of neurons in the cochlear nucleus (CN) and inferior colliculus (IC). In all cases there were concomitant shifts in the CRF and the BFs. Results were the same for single and multi-units, and for CN and IC units. Although the BF reliably changed with shifts in the CRF, the majority of the units showed no change in minimum threshold or the sharpness (Q10 dB) of tuning. The temperature-induced effects on cochlear tuning were similar to those previously described in nonmammalian vertebrates. The physiological data reveal that, within a narrow frequency band, cochlear and CNS tonotopy are labile in the mustached bat. The lability of tuning is further substantiated by adaptations of biosonar emission behavior with shifts in CRF (Henson et al., 1990).
髯蝠（Pteronotus parnellii）的耳朵在60千赫兹附近表现出明显的耳蜗共振，并且大脑中许多调谐敏锐的神经元的最佳频率（BF）都接近耳蜗共振频率（CRF）。利用体温在正常生理范围内（约37 - 42摄氏度）的可控变化来改变CRF，并研究耳蜗核（CN）和下丘（IC）中神经元的调谐特性。在所有情况下，CRF和BF都随之发生了相应的变化。单神经元和多神经元的结果相同，CN和IC单元的结果也相同。尽管BF随CRF的变化而可靠地改变，但大多数单元的最小阈值或调谐锐度（Q10 dB）没有变化。温度对耳蜗调谐的影响与之前在非哺乳动物脊椎动物中描述的相似。生理数据表明，在一个狭窄的频带内，髯蝠的耳蜗和中枢神经系统音调定位是不稳定的。CRF变化时生物声纳发射行为的适应性进一步证实了调谐的不稳定性（亨森等人，1990年）。
