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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Robust Rate-Place Coding of Resolved Components in Harmonic and Inharmonic Complex Tones in Auditory Midbrain
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Robust Rate-Place Coding of Resolved Components in Harmonic and Inharmonic Complex Tones in Auditory Midbrain

机译：在听觉中脑中谐波和谐波复杂音调中解析组件的鲁棒率编码

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摘要

Harmonic complex tones (HCTs) commonly occurring in speech and music evoke a strong pitch at their fundamental frequency (F0), especially when they contain harmonics individually resolved by the cochlea. When all frequency components of an HCT are shifted by the same amount, the pitch of the resulting inharmonic tone (IHCT) can also shift, although the envelope repetition rate is unchanged. A rate-place code, whereby resolved harmonics are represented by local maxima in firing rates along the tonotopic axis, has been characterized in the auditory nerve and primary auditory cortex, but little is known about intermediate processing stages. We recorded single-neuron responses to HCT and IHCT with varying F0 and sound level in the inferior colliculus (IC) of unanesthetized rabbits of both sexes. Many neurons showed peaks in firing rate when a low-numbered harmonic aligned with the neuron's characteristic frequency, demonstrating "rate-place" coding. The IC rate-place code was most prevalent for F0 > 800 Hz, was only moderately dependent on sound level over a 40 dB range, and was not sensitive to stimulus harmonicity. A spectral receptive-field model incorporating broadband inhibition better predicted the neural responses than a purely excitatory model, suggesting an enhancement of the rate-place representation by inhibition. Some IC neurons showed facilitation in response to HCT relative to pure tones, similar to cortical "harmonic template neurons" (Feng and Wang, 2017), but to a lesser degree. Our findings shed light on the transformation of rate-place coding of resolved harmonics along the auditory pathway.
机译：谐波复杂音调（HCTS）通常发生在语音和音乐中唤起了它们基本频率（F0）的强大音调，尤其是当它们包含由耳蜗单独解决的谐波时。当HCT的所有频率分量相同的量时，所得到的谐波音调（IHCT）的间距也可以转移，尽管包络重复率不变。一个率代码代码，即解决了谐波由沿着音调轴的射击率的局部最大值表示，已经表现在听觉神经和主要听觉皮层中，但对中间处理阶段知之甚少。我们记录了对HCT和IHCT的单神经元响应，在两性的未抑制兔子的劣质兔的劣质兔子（IC）中的不同F0和声级。当与神经元特征频率的低编号谐波对齐时，许多神经元显示出射击率的峰值，展示“率”编码。 F0> 800 Hz最普遍的IC率代码，仅适度依赖于40dB范围内的声级，对刺激谐波不敏感。包含宽带抑制的光谱接收场模型更好地预测了神经响应而多纯粹兴奋模型，表明通过抑制来提高率置位表示。一些IC神经元响应于HCT相对于纯音，​​类似于皮质“谐波模板神经元”（Feng and Wang，2017），但较小程度。我们的调查结果阐明了沿着听觉途径的解决谐波的率编码的转换。

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