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首页> 外文期刊>The European Journal of Neuroscience >Neuronal phase consistency tracks dynamic changes in acoustic spectral regularity
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Neuronal phase consistency tracks dynamic changes in acoustic spectral regularity

机译：神经元相一致性跟踪声光谱规律性的动态变化

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The brain parses the auditory environment into distinct sounds by identifying those acoustic features in the environment that have common relationships (e.g., spectral regularities) with one another and then grouping together the neuronal representations of these features. Although there is a large literature that tests how the brain tracks spectral regularities that are predictable, it is not known how the auditory system tracks spectral regularities that are not predictable and that change dynamically over time. Furthermore, the contribution of brain regions downstream of the auditory cortex to the coding of spectral regularity is unknown. Here, we addressed these two issues by recording electrocorticographic activity, while human patients listened to tone--burst sequences with dynamically varying spectral regularities, and identified potential neuronal mechanisms of the analysis of spectral regularities throughout the brain. We found that the degree of oscillatory stimulus phase consistency (PC) in multiple neuronal--frequency bands tracked spectral regularity. In particular, PC in the delta--frequency band seemed to be the best indicator of spectral regularity. We also found that these regularity representations existed in multiple regions throughout cortex. This widespread reliable modulation in PC - both in neuronal--frequency space and in cortical space -suggests that phase-based modulations may be a general mechanism for tracking regularity in the auditory system specifically and other sensory systems more generally. Our findings also support a general role for the delta-frequency band in processing the regularity of auditory stimuli.
机译：通过识别具有共同关系（例如，光谱规律性）的环境中的那些声学特征，将听觉环境解析为不同的声音，彼此具有共同关系（例如，光谱规律性），然后将这些特征的神经元表示分组在一起。虽然有一个大的文献测试大脑如何跟踪可预测的频谱规律，但尚不知道听觉系统如何跟踪不可预测的频谱规律，并且随时间动态变化。此外，听觉皮质下游对谱规律编码的脑区的贡献是未知的。在这里，我们通过记录电加理活动来解决这两个问题，而人类患者倾听了具有动态变化的光谱规律的色调突发序列，并确定了整个大脑的光谱规律分析的潜在神经元机制。我们发现，多个神经元频带的振荡刺激相一致性（PC）的程度跟踪频谱规则。特别是，Delta - 频带中的PC似乎是频谱规律性的最佳指标。我们还发现，这些规则性表示存在于整个皮质的多个区域中。在PC中的这种广泛的可靠调制 - 无论是神经元空间和皮质空间中，都是基于相位的调制，可以是用于在听觉系统中跟踪定性的一般机制，具体地和其他感官系统更普遍。我们的调查结果还支持三角频带处理听觉刺激规律方面的一般作用。

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