Carlile S
University Laboratory of Physiology, Oxford, United Kingdom.
J Acoust Soc Am. 1990 Nov;88(5):2196-204. doi: 10.1121/1.400116.
In the previous paper the directional response characteristics of the ferret auditory periphery were examined. In this study further measurements of the spectral transfer functions (STFs) of the auditory periphery were obtained at locations close to the tympanic membrane. There was considerable variation in the STFs recorded from different animals and between recordings made at each end of the auditory canal in the same animal. However, calculation of the so called "location dependency function" demonstrated that changes in the location of the stimulus produced the same pattern of changes in the STFs in all recordings. Changes in the spectral transformation for azimuth locations in the ipsilateral auditory field were examined by calculating the horizon STF. The gain transformations of frequencies below 20 kHz were found to be asymmetrical about the interaural axis so that maximum gain was obtained for anterior stimulus locations. In contrast, the maximum gain for frequencies above 20 kHz was obtained for stimulus locations about the interaural axis, and movement of the stimulus location into either the anterior or posterior fields produced symmetrical reductions in gain. These changes were related to the directional properties of the periphery examined in the previous paper [S. Carlile, J. Acoust. Soc. Am. 88, 2180-2195 (1990)]. The spatial resolution of the monaural information provided by the peripheral STFs is dependent on the rate of change of the transformations as a function of azimuthal displacement of the stimulus location. This was examined by calculating the unsigned first spatial derivative for each frequency in the horizon STF.(ABSTRACT TRUNCATED AT 250 WORDS)
在前一篇论文中，研究了雪貂听觉外周的方向响应特性。在本研究中，在靠近鼓膜的位置进一步测量了听觉外周的频谱传递函数（STF）。从不同动物记录的STF以及同一动物耳道两端记录之间存在相当大的差异。然而，所谓“位置依赖函数”的计算表明，刺激位置的变化在所有记录中都产生了相同模式的STF变化。通过计算水平STF来检查同侧听觉场中方位位置的频谱变换变化。发现低于20 kHz频率的增益变换关于耳间轴不对称，因此在前部刺激位置获得最大增益。相比之下，高于20 kHz频率的最大增益是在围绕耳间轴的刺激位置获得的，并且刺激位置移动到前部或后部场中会导致增益对称降低。这些变化与前一篇论文[S. Carlile, J. Acoust. Soc. Am. 88, 2180 - 2195 (1990)]中研究的外周方向特性有关。外周STF提供的单耳信息的空间分辨率取决于变换作为刺激位置方位位移函数的变化率。这是通过计算水平STF中每个频率的无符号一阶空间导数来检查的。（摘要截短于250字）
