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首页> 外文期刊>The European Journal of Neuroscience >Response properties of neurons in the core of the central nucleus of the inferior colliculus of the barn owl.
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Response properties of neurons in the core of the central nucleus of the inferior colliculus of the barn owl.

机译：仓owl下丘中央核核心神经元的反应特性。

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摘要

The central nucleus of the inferior colliculus (ICC) is particularly important for the processing of interaural time differences (ITDs). In the barn owl, neuronal best frequencies in a subnucleus of the ICC, the ICCcore, span the animal's entire hearing range ( approximately 200-10 000 Hz). This means that low-frequency ITD-sensitive ICCcore neurons in the owl can be directly compared to ITD-sensitive mammalian ICC neurons with similar best frequencies as well as to the high-frequency ITD-sensitive neurons usually studied in owls. This report represents a first attempt to systematically describe important physiological properties of ICCcore neurons in the barn owl, with particular attention to the low-frequency region (< 2 kHz). Responses were obtained from 133 neurons or small clusters of neurons; recording sites were confirmed by histological reconstruction of electrode tracks based on electrolytic lesions. Iso-intensity frequency response functions were typically approximately 1 octave wide in the low-frequency range and approximately 1/3 octave wide in the high-frequency range. Most neurons were ITD-tuned; both noise and pure tone stimuli yielded periodic ITD tuning curves with several equivalent response maxima. In most cases ITD tuning curves had a response peak within the barn owl's physiological ITD range. ITD tuning widths were inversely correlated with neuronal best frequency. None of the ICCcore neurons studied were sensitive to interaural level differences. Monaural inputs to ICCcore cells were typically binaurally balanced, i.e. they exhibited similar response thresholds, dynamic ranges, slopes and saturation levels, for both left and right ear monaural stimulation.
机译：下丘（ICC）的中心核对于耳间时间差（ITD）的处理尤为重要。在谷仓猫头鹰中，ICC亚核（ICCcore）中神经元的最佳频率跨越了动物的整个听力范围（大约200-10 000 Hz）。这意味着可以直接将猫头鹰中的低频ITD敏感ICCcore神经元与最佳频率相似的ITD敏感哺乳动物ICC神经元以及通常在猫头鹰中研究的高频ITD敏感神经元进行比较。该报告代表了首次系统地描述仓core中ICCcore神经元的重要生理特性的尝试，尤其要注意低频区域（<2 kHz）。反应是从133个神经元或小神经元簇中获得的。通过基于电解质损伤的电极迹线的组织学重建来确认记录位点。等强度频率响应函数在低频范围内通常约为1个八度音阶，而在高频范围内通常约为1/3个八度音阶。大多数神经元都经过ITD调整。噪声和纯音刺激都会产生具有几个等效响应最大值的周期性ITD调谐曲线。在大多数情况下，ITD调整曲线的响应峰值在谷仓猫头鹰的生理ITD范围内。 ITD调整宽度与神经元最佳频率成反比。研究的ICCcore神经元均不对耳间水平差异敏感。 ICCcore细胞的单耳输入通常是双耳平衡的，即，对于左耳和右耳单耳刺激，它们表现出相似的响应阈值，动态范围，斜率和饱和度。

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