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首页> 外文期刊>Cerebral cortex >Human Auditory Cortical Dynamics During Perception of Long Acoustic Sequences: Phase Tracking of Carrier Frequency by the Auditory Steady-state Response.
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Human Auditory Cortical Dynamics During Perception of Long Acoustic Sequences: Phase Tracking of Carrier Frequency by the Auditory Steady-state Response.

机译：长声序列感知期间的人类听觉皮质动力学：通过听觉稳态响应对载波频率进行相位跟踪。

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摘要

We recorded human auditory cortical activity during the perception of long, changing acoustic signals and analyzed information provided by dynamic neural population measures over a large range of time intervals (approximately 24 ms-5 s). Participants listened to musical scales that were amplitude modulated at a rate of 41.5 Hz, generating an ongoing, stimulus-related oscillatory brain signal, the auditory steady-state response (aSSR). The aSSR generated energy at the amplitude modulation rate that was recorded using magnetoencephalography. As in previous work, the timing (phase) of this response varied with stimulus carrier frequency over the entire course of minute-long tone sequences ('phase tracking' of carrier frequency). The length of the time interval over which phase was calculated was systematically varied; significant phase tracking was regularly observed at analysis intervals of <50 ms in length. The right auditory cortex exhibited better phase tracking performance than the left at analysis intervals of 24-240 ms, and frequency dependent phase delays were consistently larger than those predicted by cochlear mechanics. Based on these empirical data, a model of the neural populations responsible for phase tracking suggests that it is produced by a subpopulation ( approximately 25%) of the cells generating the aSSR.
机译：我们记录了长时间变化的声音信号感知过程中的人类听觉皮层活动，并分析了大范围时间间隔（约24 ms-5 s）中动态神经种群测量提供的信息。参与者聆听了以41.5 Hz的频率进行调幅的音阶，产生了持续的，与刺激有关的振荡脑信号，即听觉稳态响应（aSSR）。 aSSR产生的振幅调制速率的能量是使用脑磁图记录的。和以前的工作一样，此响应的时间（相位）在微小的长音序列的整个过程中（载波频率的“相位跟踪”）随激励载波频率而变化。系统计算相位的时间间隔长度是系统变化的;在长度小于50毫秒的分析间隔中定期观察到明显的相位跟踪。在24-240毫秒的分析间隔中，右听皮层显示出比左听更好的相位跟踪性能，并且频率相关的相位延迟始终大于人工耳蜗力学预测的相位延迟。根据这些经验数据，负责相位跟踪的神经种群模型表明，它是由产生aSSR的细胞亚群（约25％）产生的。

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