Representation of interaural time difference in the central nucleus of the barn owl's inferior colliculus
Representation of interaural time difference in the central nucleus of the barn owl's inferior colliculus
复制标题
仓鸮下丘中央核的耳间时间差表示
DOI：
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发表时间：
1987
影响因子：
5.3
通讯作者：
Masakazu Konishi
中科院分区：
文献类型：
--
作者：
Hermann Wagner;Terry T. Takahashi;Masakazu Konishi
本文研究了仓鸮下丘中央核在确定声源方位中的作用。中央核包含许多对耳间时差（ITD）敏感的神经元，这是仓鸮方位的线索。这些神经元的反应随着音调或噪音的爆发以循环的方式变化。响应最大值在刺激音周期的整数倍处出现，或者，如果刺激是噪声，则在与神经元最佳频率对应的周期的整数倍处出现。这样的神经元可以通过它们的相对尖峰速率，发出到达左右耳的声音之间的相位差的信号。由于一个耳间相位差对应不止一个ITD，因此这些神经元对ITD的表征是模糊的。我们称这种现象为相位模糊。中央核是局部组织的，它的神经元被狭窄地调谐到频率。垂直于等频层的神经元阵列构成一个生理和解剖单元；只有一个ITD，即阵列特异性ITD，在相同的相对水平上激活阵列中的所有神经元。因此，我们可以说，在中央核中，ITD在一系列神经元中是保守的。阵列特定的过渡段被映射并包含了仓鸮的整个听觉空间。外核的单个空间特异性神经元接收来自广泛频率通道的输入（Knudsen和Konishi， 1978），对于独特的过渡段具有选择性。空间特异性神经元在受到噪声刺激时不会表现出相位模糊（Takahashi和Konishi， 1986）。空间特异性神经元接收来自阵列的输入，这些阵列对相同的过渡段有选择性。阵列中神经元的集体反应可能是空间特异性神经元中不存在相位模糊的基础。
This paper investigates the role of the central nucleus of the barn owl's inferior colliculus in determination of the sound-source azimuth. The central nucleus contains many neurons that are sensitive to interaural time difference (ITD), the cue for azimuth in the barn owl. The response of these neurons varies in a cyclic manner with the ITD of a tone or noise burst. Response maxima recur at integer multiples of the period of the stimulating tone, or, if the stimulus is noise, at integer multiples of the period corresponding to the neuron's best frequency. Such neurons can signal, by means of their relative spike rate, the phase difference between the sounds reaching the left and right ears. Since an interaural phase difference corresponds to more than one ITD, these neurons represent ITD ambiguously. We call this phenomenon phase ambiguity. The central nucleus is tonotopically organized and its neurons are narrowly tuned to frequency. Neurons in an array perpendicular to isofrequency laminae form a physiological and anatomical unit; only one ITD, the array-specific ITD, activates all neurons in an array at the same relative level. We, therefore, may say that, in the central nucleus, an ITD is conserved in an array of neurons. Array-specific ITDs are mapped and encompass the entire auditory space of the barn owl. Individual space-specific neurons of the external nucleus, which receive inputs from a wide range of frequency channels (Knudsen and Konishi, 1978), are selective for a unique ITD. Space-specific neurons do not show phase ambiguity when stimulated with noise (Takahashi and Konishi, 1986). Space-specific neurons receive inputs from arrays that are selective for the same ITD. The collective response of the neurons in an array may be the basis for the absence of phase ambiguity in space-specific neurons.
噪声刺激的耳间时间延迟对猫下丘低频细胞的影响。
影响因子：
2.5
作者：
Yin,TC;Chan,JC;Irvine,DR
通讯作者：
Irvine,DR
猫下丘低频神经元的双耳相互作用。
影响因子：
2.5
作者：
Yin,TC;Kuwada,S
通讯作者：
Kuwada,S
猫头鹰脑干中耳间相位差的神经图。
DOI：
10.1073/pnas.83.21.8400
发表时间：
1986
影响因子：
11.1
作者：
Sullivan,WE;Konishi,M
通讯作者：
Konishi,M