Estimated cochlear delays in low best-frequency neurons in the barn owl cannot explain coding of interaural time difference.
Estimated cochlear delays in low best-frequency neurons in the barn owl cannot explain coding of interaural time difference.
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仓鸮低频最佳频率神经元的耳蜗延迟估计无法解释耳间时间差的编码
DOI：
10.1152/jn.00501.2010
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发表时间：
1954
影响因子：
2.5
通讯作者：
Wagner H
中科院分区：
文献类型：
--
作者：
Singheiser M;Fischer BJ;Wagner H
低频范围（<3 kHz）在仓鸮听力中的功能作用尚不清楚。在这里，我们测试了耳蜗延迟是否可以解释该频率范围内耳间时间差（ITD）的表示。记录是从下丘中央核的核心神经元获得的。这些神经元的反应随着刺激的 ITD 的不同而变化。背腹穿透中所有神经元共享的响应峰值称为阵列特异性 ITD，并作为神经元中给定 ITD 表示的标准。阵列特定的 ITD 分布广泛。双耳刺激、对侧刺激和同侧刺激获得的等水平频率响应函数表现出明显的响应峰值，伴随的频率称为最佳频率。数据根据立体模型的预测进行了测试，假设耳蜗延迟作为神经元最佳 ITD 的来源。根据该模型，由同侧和对侧最佳频率之间的不匹配确定的不同耳蜗延迟是双耳神经元中 ITD 的来源。不匹配应取决于最佳频率和最佳 ITD。立体模型的预测在此处分析的低最佳频率神经元中并未实现。结论是，谷仓猫头鹰的最佳 ITD 表现与耳蜗延迟无关。
The functional role of the low-frequency range (<3 kHz) in barn owl hearing is not well understood. Here, it was tested whether cochlear delays could explain the representation of interaural time difference (ITD) in this frequency range. Recordings were obtained from neurons in the core of the central nucleus of the inferior colliculus. The response of these neurons varied with the ITD of the stimulus. The response peak shared by all neurons in a dorsoventral penetration was called the array-specific ITD and served as criterion for the representation of a given ITD in a neuron. Array-specific ITDs were widely distributed. Isolevel frequency response functions obtained with binaural, contralateral, and ispilateral stimulation exhibited a clear response peak and the accompanying frequency was called the best frequency. The data were tested with respect to predictions of a model, the stereausis model, assuming cochlear delays as source for the best ITD of a neuron. According to this model, different cochlear delays determined by mismatches between the ipsilateral and contralateral best frequencies are the source for the ITD in a binaural neuron. The mismatch should depend on the best frequency and the best ITD. The predictions of the stereausis model were not fulfilled in the low best-frequency neurons analyzed here. It is concluded that cochlear delays are not responsible for the representation of best ITD in the barn owl.
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DOI：
--
发表时间：
2009
期刊：
Journal of the Association for Research in Otolaryngology
影响因子：
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作者：
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作者：
Lane, CC;Delgutte, B
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Delgutte, B
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