SPONTANEOUS RATES, THRESHOLDS AND TUNING OF AUDITORY-NERVE FIBERS IN THE GERBIL - COMPARISONS TO CAT DATA
SPONTANEOUS RATES, THRESHOLDS AND TUNING OF AUDITORY-NERVE FIBERS IN THE GERBIL - COMPARISONS TO CAT DATA
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DOI：
10.1016/0378-5955(89)90115-9
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发表时间：
1989-10-01
期刊：
影响因子：
2.8
通讯作者：
SCHMIEDT, RA
中科院分区：
文献类型：
--
作者：
SCHMIEDT, RA
本文描述了11只蒙古沙鼠245条听觉神经纤维的自发率、阈值和调谐曲线特征。这些动物在低噪音环境中饲养，不同频率的听力阈值相似。通过一种描述cat听觉纤维调谐的算法获得了调谐曲线，从而可以直接与cat发表的数据进行比较。结果表明，沙鼠和猫的数据存在基本的相似性，尽管一些微小的差异也很明显。调优曲线带宽，即在特征频率（CF）上高于阈值10和40 dB的测量值，遵循cat数据中的趋势。像猫一样，沙鼠的听觉神经纤维也有一系列的自发速率。在沙鼠个体中，自发率低的纤维比自发率高的纤维具有更高的阈值。11只沙鼠中有5只表现出自发频率的特征，这让人想起那些安静饲养的年轻猫。剩下的沙鼠的轮廓倾向于被压缩到一个较小的自发频率范围，特征频率高于5千赫，很像那些噪音历史未知的老猫。自发压缩的原因不明显。猫和沙鼠在自发率和CF阈值方面的对应意味着存在哺乳动物听觉系统共同的基本机制。
Characteristics of 245 auditory nerve fibers in eleven Mongolian gerbils are described in terms of spontaneous rates, thresholds, and tuning curves. The animals were reared in a low-noise environment and had similar hearing thresholds across frequency. Tuning curves were obtained with an algorithm developed to characterize the tuning of auditory fibers in cat, thereby allowing direct comparisons to published data from cat. The results demonstrate that basic similarities exist between gerbil and cat data, although some minor differences are also apparent. Tuning curve bandwidths, as measured 10 and 40 dB above the thresholds at the characteristic frequency (CF), follow trends found in cat data. Like cat, auditory nerve fibers in the gerbil have a range of spontaneous rates. In individual gerbils, fibers associated with low spontaneous rates have higher thresholds than do fibers of similar CF with high rates. Five of the eleven gerbils showed profiles of spontaneous rate across frequency reminiscent of those obtained from quiet-raised young cats. The profiles of the remaining gerbils tended to be compressed to a smaller range of spontaneous rates for characteristic frequencies above about five kHz, much like older cats with unknown noise histories. The cause of the spontaneous compression is not obvious. The correspondence between cat and gerbil with regard to spontaneous rate and CF threshold implies the presence of fundamental mechanisms that are common to mammalian auditory systems.