NEURONAL DISCHARGE RATE IS UNSUITABLE FOR ENCODING SOUND INTENSITY AT THE INFERIOR-COLLICULUS LEVEL
NEURONAL DISCHARGE RATE IS UNSUITABLE FOR ENCODING SOUND INTENSITY AT THE INFERIOR-COLLICULUS LEVEL
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DOI：
10.1016/0378-5955(88)90035-4
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发表时间：
1988-09-01
期刊：
影响因子：
2.8
通讯作者：
MERZENICH, MM
中科院分区：
文献类型：
--
作者：
EHRET, G;MERZENICH, MM
本文记录了猫下丘中央核（ICC）单个神经元对纯音和连续噪声反应的频率-强度函数。在64个定量研究的神经元中，只有6%的神经元对短纯音的反应是单调的，12.5%的神经元对连续噪声的反应是单调的。其他神经元具有在测试的任何超阈值水平（3-80 dB）下可能出现的单峰或多峰功能。在78%的神经元中，对音调和噪声的反应的速率-强度函数具有不同的形状。我们解释这种刺激依赖性的形状的速率-强度函数的大多数神经元的证据对声音强度编码的基础上的形状的速率-强度函数在ICC水平。从具有相似特征频率的神经元或从我们样本的所有神经元平均的速率-强度函数表明在至少60 dB的声音强度上恒定的平均放电。这排除了通过ICC中的平均神经元放电率进行的声音强度编码。
Rate-intensity functions from single neurons in the central nucleus of the inferior colliculus (ICC) of the cat in response to tone bursts and continuous noise were recorded. Only 6% of 64 quantitatively studied neurons had monotonic functions in response to tone bursts, 12.5% in response to continuous noise. The other neurons had functions with a single peak which could occur at any super-threshold level tested (3-80 dB), or with multiple peaks. In 78% of the neurons the rate-intensity functions in response to tones and noise were of different shape. We interpret this stimulus dependency of the shape of rate-intensity functions of most neurons as evidence against sound-intensity coding only on the basis of the shape of rate-intensity functions at the ICC level. Rate-intensity functions averaged from neurons with similar characteristic frequencies or from all neurons of our sample indicate a constant average discharge over at least 60 dB sound intensity. This excludes sound-intensity coding by means of an average neuronal discharge rate in the ICC.