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首页> 外文期刊>Journal of Neurophysiology >Human cortical responses to slow and fast binaural beats reveal multiple mechanisms of binaural hearing
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Human cortical responses to slow and fast binaural beats reveal multiple mechanisms of binaural hearing

机译：人类对慢和快速双耳搏动的皮质反应揭示了双耳听力的多种机制

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When two tones with slightly different frequencies are presented to both ears, they interact in the central auditory system and induce the sensation of a beating sound. At low difference frequencies, we perceive a single sound, which is moving across the head between the left and right ears. The percept changes to loudness fluctuation, roughness, and pitch with increasing beat rate. To examine the neural representations underlying these different perceptions, we recorded neuromagnetic cortical responses while participants listened to bin-aural beats at a continuously varying rate between 3 Hz and 60 Hz. Binaural beat responses were analyzed as neuromagnetic oscillations following the trajectory of the stimulus rate. Responses were largest in the 40-Hz gamma range and at low frequencies. Binaural beat responses at 3 Hz showed opposite polarity in the left and right auditory cortices. We suggest that this difference in polarity reflects the opponent neural population code for representing sound location. Binaural beats at any rate induced gamma oscillations. However, the responses were largest at 40-Hz stimulation. We propose that the neuromagnetic gamma oscillations reflect postsynaptic modulation that allows for precise timing of cortical neural firing. Systematic phase differences between bilateral responses suggest that separate sound representations of a sound object exist in the left and right auditory cortices. We conclude that binaural processing at the cortical level occurs with the same temporal acuity as monaural processing whereas the identification of sound location requires further interpretation and is limited by the rate of object representations.
机译：当两只耳朵的频率略有不同的两个音调出现时，它们在中央听觉系统中相互作用并引起拍打声的感觉。在低差频率处，我们感知到一个声音，该声音在左右耳之间的头部中移动。随着拍率的增加，感知会改变响度波动，粗糙度和音调。为了检查这些不同感觉背后的神经表征，我们记录了神经磁皮质反应，而参与者以3 Hz至60 Hz的连续变化速率聆听bin-aural搏动。根据刺激速率的轨迹，将双耳搏动反应分析为神经磁振荡。在40 Hz伽马范围和低频下，响应最大。 3 Hz的双耳搏动反应在左右听觉皮层中显示相反的极性。我们建议这种极性上的差异反映了代表声音位置的对手神经种群代码。无论如何，双耳节律都会引起伽玛振动。但是，响应在40 Hz刺激下最大。我们建议神经磁伽玛振荡反映突触后调制，允许皮质神经放电的精确计时。双边反应之间的系统性相位差异表明，左侧和右侧听觉皮层中存在声音对象的单独声音表示。我们得出的结论是，皮质水平上的双耳处理与单耳处理具有相同的时间敏锐度，而声音位置的识别则需要进一步解释，并且受对象表示率的限制。

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