Neural map of interaural phase difference in the owl's brainstem.
Neural map of interaural phase difference in the owl's brainstem.
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猫头鹰脑干中耳间相位差的神经图。
DOI：
10.1073/pnas.83.21.8400
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发表时间：
1986
影响因子：
11.1
通讯作者：
Konishi,M
中科院分区：
文献类型：
--
作者：
Sullivan,WE;Konishi,M
仓鸮（Tyto alba）层状核的神经元是双耳会聚的第一个部位，以锁相方式对传递到任一耳朵的音调做出反应。从一只耳朵引出锁相尖峰可能比从另一只耳朵引出锁相尖峰需要更长的时间。这种延迟差异因神经元而异，并且与音调频率无关。在双耳刺激中，当一只耳朵中的声音领先另一只耳朵中的声音的量等于它们的延迟差异但符号相反时，神经元反应最佳。这种情况导致锁相尖峰从两侧同时到达。因此，层状神经元可以被描述为重合检测器。音调诱发的诱发电位的相位，称为“神经语音”，随着层状核中的位置而系统地变化。核内从背侧到腹侧，对侧引出电位的相位延迟减小，而同侧对应电位的相位延迟增加。因此，如果神经语音延迟是由于锁相尖峰的延迟造成的，则会显示延迟差异的有序表示。由于层状神经元充当重合检测器，因此它们应根据其在细胞核中的位置对耳间相位差表现出选择性。因此，层状核可能通过使用延迟线和重合检测的原理来测量和映射耳间相位差。
Neurons of the barn owl's (Tyto alba) nucleus laminaris, the first site of binaural convergence, respond in a phase-locked fashion to a tone delivered to either ear. It may take longer to elicit phase-locked spikes from one ear than from the other. This disparity in delay differs from neuron to neuron and is independent of tonal frequency. In binaural stimulation, neurons respond best when sound in one ear leads that in the other by an amount equal to their delay disparities but opposite in sign. This condition causes simultaneous arrival of phase-locked spikes from the two sides. Laminaris neurons can thus be described as coincidence detectors. The phase of a tone-induced evoked potential, termed "neurophonic," varies systematically with position in nucleus laminaris. From dorsal to ventral within the nucleus, the phase delay of a contralaterally elicited potential decreases and that of its ipsilateral counterpart increases. Therefore, if the neurophonic delay is due to the delay of phase-locked spikes, an orderly representation of delay disparities is shown. Because they act as coincidence detectors, laminaris neurons should show selectivity for interaural phase difference based on their place in the nucleus. Thus, nucleus laminaris presumably measures and maps interaural phase differences by using the principles of delay lines and coincidence detection.