THE AUDITORY PERIPHERY OF THE FERRET .1. DIRECTIONAL RESPONSE PROPERTIES AND THE PATTERN OF INTERAURAL LEVEL DIFFERENCES
THE AUDITORY PERIPHERY OF THE FERRET .1. DIRECTIONAL RESPONSE PROPERTIES AND THE PATTERN OF INTERAURAL LEVEL DIFFERENCES
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DOI：
10.1121/1.400115
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发表时间：
1990-11-01
影响因子：
2.4
通讯作者：
CARLILE, S
中科院分区：
文献类型：
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作者：
CARLILE, S
的雪貂的听觉周边的声音的转换已经使用脉冲响应技术的动物周围的大量的声音位置进行了研究。从每个刺激位置获得的详细频谱转换函数（STFs）中提取各个频率，并使用复杂的空间插值例程，用于计算该频率下外周的方向响应。方向响应的强度与分析频率直接相关。此外，当分析频率增加到20 kHz时，方向响应的取向在从水平线的仰角（E0 °）上增加。至约E30 °，而方位角位置在30 °保持相当恒定。到40度。从中线。对于20 kHz以上的分析频率，响应变得越来越指向同侧耳间轴。还计算了所有研究动物的耳间水平差异（ILD）。ILD在3-24 kHz的频率范围内从约5 dB增加到25 dB。对于低于16 kHz的频率，等ILD轮廓的二维模式大致同心，并以耳间轴为中心。对于更高的频率，ILD轮廓倾向于集中在更前部和下部的位置。随着分析频率的增加，听觉周边的方向性增加，以及在高分析频率下的响应中存在尖锐的零值，这与耳廓孔径产生的衍射效应一致。然而，这个简单的模型不能预测在低到中频范围内的方向响应。
The transformations of sound by the auditory periphery of the ferret have been investigated using an impulse response technique for a large number of sound locations surrounding the animal. Individual frequencies were extracted from the detailed spectral transformation functions (STFs) obtained for each stimulus location and, using sophisticated spatial interpolation routines, were used to calculate the directional response of the periphery at that frequency. The strength of the directional response was directly related to the analysis frequency. Furthermore, as the analysis frequency was increased to 20 kHz, the orientation of the directional response increased in elevation from the horizon (E0.degree.) to about E30.degree., while the azimuthal location remained fairly constant at 30.degree. to 40.degree. from the midline. For analysis frequencies above 20 kHz, the response became increasingly directional toward the ipsilateral interaural axis. The interaural level differences (ILDs) were also calculated for all animals studied. ILDs increased from around 5 to 25 dB over the range of frequencies from 3-24 kHz. The two-dimensional patterns of iso-ILD contours were roughly concentric and centered on the interaural axis for frequencies below 16 kHz. For higher frequencies, there was a tendency for the ILD contours to be centered on more anterior and inferior locations. The increased directionality of the auditory periphery with increasing analysis frequency, together with the presence of sharp nulls in the response at high analysis frequencies, is consistent with a diffractive effect produced by the aperture of the pinna. However, this simple model does not predict the directional responses over the low to middle frequency range.