DIRECTIONAL PROPERTIES OF THE AUDITORY PERIPHERY IN THE GUINEA-PIG
DIRECTIONAL PROPERTIES OF THE AUDITORY PERIPHERY IN THE GUINEA-PIG
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DOI：
10.1016/0378-5955(87)90117-1
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发表时间：
1987-01-01
期刊：
影响因子：
2.8
通讯作者：
PETTIGREW, AG
中科院分区：
文献类型：
--
作者：
CARLILE, S;PETTIGREW, AG
豚鼠外耳的方向灵敏度是通过记录当声源位置在360 °内变化时耳蜗颤噪音的振幅对1和20 kHz之间的频率的变化来确定的。水平听觉空间。对低于3 kHz的频率的方向响应几乎是全向的。频率在3和12 kHz之间的方向性反应逐渐朝向前中线。对12 kHz以上频率的反应沿同侧耳间轴沿着方向性很强。与此相反，在动物的所有频率的方向性反应，其pinterm已被删除定向沿着同侧耳间轴。观察结果表明，在豚鼠的听觉外周的方向性反应的方向和强度依赖于频率，这种依赖性是可归因于，至少部分地，到耳廓的声学特性。观察结果还表明，有一个实质性的变化，在不同频率的耳间强度差和频谱传递函数的耳朵，根据声源的位置在同侧hemifield。观察到这些变化是不对称的耳间轴的动物的听觉范围的很大一部分是一致的假设，即频率依赖的方向性的听觉周边提供了一个频谱线索的宽带声音在自由领域的本地化。
The directional sensitivity of the outer ear of the guinea pig was determined by recording changes in the amplitude of the cochlear microphonic to frequencies between 1 and 20 kHz as the location of the sound source was changed throughout 360.degree. of horizontal auditory space. The directional responses to frequencies below 3 kHz were almost omnidirectional. The directional responses for frequencies between 3 and 12 kHz were progressively more directional toward the anterior midline. The responses for frequencies above 12 kHz were highly directional along the ipsilateral interaural axis. In contrast, the directional responses to all frequencies in animals whose pinnae had been removed were orientated along the ipsilateral interaural axis. The observations suggest that the orientation and strength of the directional response of the auditory periphery in the guinea pig are dependent on frequency and that this dependence is attributable, at least in part, to the acoustic properties of the pinna. The observations also indicate that there is a substantial change in the interaural intensity difference at various frequencies and in the spectral transfer function of the ear according to the location of the sound source in the ipsilateral hemifield. The observation that these changes are asymmetrical about the interaural axis for a substantial part of the auditory range of the animal is consistent with the hypothesis that the frequency dependent directionality of the auditory periphery provides a spectral cue for the localization of broad band sound in the free field.