低频声调的辨别利用时间精细结构
Discrimination of low-frequency tones employs temporal fine structure
摘要：
听觉神经元可以通过锁相其对刺激的响应来保持低频音调的时间精细结构。然而，除了声音定位之外，人们对这种时间信息在大脑信号处理中的作用知之甚少。通过心理声学的研究，我们提供了直接的证据，人类使用时间的精细结构来区分频率。为此，我们构建的音调是基于一个单一的频率，但在其中，通过级联的小波，相位随机变化，每隔几个周期。然后，我们测试这些相位变化的音调，没有相位变化的控制音，和短的音调，包括一个单一的小波的频率歧视。对于低于几千赫兹的载波频率，我们发现相位变化系统地恶化频率歧视。没有这样的效果出现较高的载波频率，在中央听觉系统的时间信息是不可用的。
英文摘要：
An auditory neuron can preserve the temporal fine structure of a low-frequency tone by phase-locking its response to the stimulus. Apart from sound localization, however, little is known about the role of this temporal information for signal processing in the brain. Through psychoacoustic studies we provide direct evidence that humans employ temporal fine structure to discriminate between frequencies. To this end we construct tones that are based on a single frequency but in which, through the concatenation of wavelets, the phase changes randomly every few cycles. We then test the frequency discrimination of these phase-changing tones, of control tones without phase changes, and of short tones that consist of a single wavelets. For carrier frequencies below a few kilohertz we find that phase changes systematically worsen frequency discrimination. No such effect appears for higher carrier frequencies at which temporal information is not available in the central auditory system.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
