LOW-FREQUENCY NEURAL AND COCHLEAR-MICROPHONIC TUNING CURVES IN GERBIL
LOW-FREQUENCY NEURAL AND COCHLEAR-MICROPHONIC TUNING CURVES IN GERBIL
复制标题
DOI：
10.1121/1.382000
复制
发表时间：
1978-01-01
影响因子：
2.4
通讯作者：
ZWISLOCKI, JJ
中科院分区：
文献类型：
--
作者：
SCHMIEDT, RA;ZWISLOCKI, JJ
将单个听觉神经纤维的平均调谐曲线与针对耳蜗电过滤进行校正的平均耳蜗麦克风（CM）调谐曲线进行比较。神经和 CM 数据是从蒙古沙鼠 (Meriones unguiculatus) 获得的，具有相同的声学系统和类似的中耳效应校正。在这些条件下，第二和第三耳蜗圈中的 CM 调谐类似于其特征频率 (CF) 对应于 CM 最佳频率（2.5 和 0.5 kHz）的纤维的调谐。低 CF 纤维似乎几乎没有发生锐化。对于低于最佳频率的频率，最顶端电极位置处的 CM 调谐比预期的更尖锐，这一结果可能是由于低频下螺旋线的分流效应。先前的建模结果已经证实，心尖基底膜调谐可能会明显受到螺旋体机械阻抗的影响。这种螺旋效应可以解释低CF纤维的神经调谐曲线的近对称形状。
Average tuning curves of single auditory-nerve fibers were compared with average cochlear-microphonic (CM) tuning curves corrected for electrical filtering of the cochlea. The neural and CM data were obtained from Mongolian gerbils (Meriones unguiculatus) with the same acoustic system and similar corrections for middle-ear effects. Under these conditions the CM tuning in the 2nd and 3rd cochlear turns was similar to the tuning of fibers whose characteristic frequencies (CF) correspond to the CM best frequencies (2.5 and 0.5 kHz). Little sharpening seemed to take place for low CF fibers. CM tuning at the most apical electrode position was sharper than expected for frequencies below the best frequency, a result that may be due to the shunting effect of the helicotrema at low frequencies. Previous modeling results have confirmed that apical basilar-membrane tuning may be appreciably affected by the mechanical impedance of the helicotrema. This helicotrema effect may account for the nearly symmetrical shapes of neural tuning curves of low-CF fibers.