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首页> 外文期刊>Journal of Neurophysiology >Effects of amplitude modulation on the coding of interaural time differences of low-frequency sounds in the inferior colliculus. II. Neural mechanisms.
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Effects of amplitude modulation on the coding of interaural time differences of low-frequency sounds in the inferior colliculus. II. Neural mechanisms.

机译：幅度调制对下丘低频声音的听觉时间差编码的影响。二。神经机制。

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摘要

In our companion paper, we reported on interaural time difference (ITD)-sensitive neurons that enhanced, suppressed, or did not change their response when identical AM was added to both ears. Here, we first examined physical factors such as the difference in the interaural correlation, spectrum, or energy between the modulated and unmodulated signals. These were insufficient to explain the observed enhancement and suppression. We then examined neural mechanisms by selectively modulating the signal to each ear, varying modulation depth, and adding background noise to the unmodulated signal. These experiments implicated excitatory and inhibitory monaural inputs to the inferior colliculus (IC). These monaural inputs are postulated to adapt to an unmodulated signal and adapt less to a modulated signal. Thus enhancement or suppression is created by the convergence of these excitatory or inhibitory inputs with the inputs from the binaural comparators. Under modulation, the role of the monaural input is to shift the threshold of the IC neuron. Consistent with this role, background noise mimicked the effect of modulation. Functionally, enhancement and suppression may serve in detecting the degree of modulation in a sound source while preserving ITD information.
机译：在我们的同行论文中，我们报道了当对两只耳朵添加相同的AM时，耳间时差（ITD）敏感神经元会增强，抑制或不改变其反应。在这里，我们首先检查了物理因素，例如调制后信号与未调制信号之间的听觉相关性，频谱或能量之差。这些不足以解释观察到的增强和抑制。然后，我们通过选择性地调制到每个耳朵的信号，改变调制深度并向未调制的信号添加背景噪声来检查神经机制。这些实验牵涉到下丘脑（IC）的兴奋性和抑制性单声道输入。假定这些单声道输入适应于未调制的信号，而较少适应于调制的信号。因此，通过将这些兴奋性或抑制性输入与双耳比较器的输入进行收敛来产生增强或抑制。在调制下，单声道输入的作用是改变IC神经元的阈值。与此角色一致，背景噪声模仿了调制效果。在功能上，增强和抑制可用于检测声源中的调制度，同时保留ITD信息。

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