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首页> 外文期刊>Journal of Neurophysiology >Azimuth and envelope coding in the inferior colliculus of the unanesthetized rabbit: Effect of reverberation and distance
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Azimuth and envelope coding in the inferior colliculus of the unanesthetized rabbit: Effect of reverberation and distance

机译：未麻醉兔下丘的方位角和包络编码：混响和距离的影响

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摘要

Recognition and localization of a sound are the major functions of the auditory system. In real situations, the listener and different degrees of reverberation transform the signal between the source and the ears. The present study was designed to provide these transformations and examine their influence on neural responses. Using the virtual auditory space (VAS) method to create anechoic and moderately and highly reverberant environments, we found the following: 1) In reverberation, azimuth tuning was somewhat degraded with distance whereas the direction of azimuth tuning remained unchanged. These features remained unchanged in the anechoic condition. 2) In reverberation, azimuth tuning and envelope synchrony were degraded most for neurons with low best frequencies and least for neurons with high best frequencies. 3) More neurons showed envelope synchrony to binaural than to monaural stimulation in both anechoic and reverberant environments. 4) The percentage of envelope-coding neurons and their synchrony decreased in reverberation with distance, whereas it remained constant in the anechoic condition. 5) At far distances, for both binaural and monaural stimulation, the neural gain in reverberation could be as high as 30 dB and as much as 10 dB higher than those in the anechoic condition. 6) The majority of neurons were able to code both envelope and azimuth in all of the environments. This study provides a foundation for understanding the neural coding of azimuth and envelope synchrony at different distances in reverberant and anechoic environments. This is necessary to understand how the auditory system processes where and what information in real environments.
机译：声音的识别和定位是听觉系统的主要功能。在实际情况下，听众和不同程度的混响会在源和耳朵之间转换信号。本研究旨在提供这些转换并检查其对神经反应的影响。使用虚拟听觉空间（VAS）方法创建无回声，适度和高度混响的环境，我们发现以下内容：1）在混响中，方位调谐会随着距离而降低，而方位调谐的方向则保持不变。在消声条件下，这些特征保持不变。 2）在混响中，最佳频率较低的神经元的方位角调谐和包络同步性下降最多，而最佳频率较高的神经元则最小。 3）在无回声和混响环境中，与双耳刺激相比，更多的神经元显示出与双耳的包膜同步。 4）包膜编码神经元的百分比及其同步性随着距离的混响而降低，而在消声条件下则保持不变。 5）在较远的距离上，对于双耳和单耳刺激，混响中的神经增益可能比消声条件下的神经增益高30 dB，高10 dB。 6）大多数神经元在所有环境中都能编码包络线和方位角。该研究为了解混响和无回声环境中不同距离的方位角和包络同步的神经编码提供了基础。这对于了解听觉系统如何处理真实环境中的何处以及哪些信息是必要的。

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