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首页> 外文期刊>The European Journal of Neuroscience >Theta band oscillations reflect more than entrainment: behavioral and neural evidence demonstrates an active chunking process
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Theta band oscillations reflect more than entrainment: behavioral and neural evidence demonstrates an active chunking process

机译：Theta带振荡反映超过夹带：行为和神经证据表明了积极的分布过程

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Abstract Parsing continuous acoustic streams into perceptual units is fundamental to auditory perception. Previous studies have uncovered a cortical entrainment mechanism in the delta and theta bands (~1–8?Hz) that correlates with formation of perceptual units in speech, music, and other quasi‐rhythmic stimuli. Whether cortical oscillations in the delta‐theta bands are passively entrained by regular acoustic patterns or play an active role in parsing the acoustic stream is debated. Here, we investigate cortical oscillations using novel stimuli with 1/f modulation spectra. These 1/f signals have no rhythmic structure but contain information over many timescales because of their broadband modulation characteristics. We chose 1/f modulation spectra with varying exponents of f, which simulate the dynamics of environmental noise, speech, vocalizations, and music. While undergoing magnetoencephalography (MEG) recording, participants listened to 1/f stimuli and detected embedded target tones. Tone detection performance varied across stimuli of different exponents and can be explained by local signal‐to‐noise ratio computed using a temporal window around 200?ms. Furthermore, theta band oscillations, surprisingly, were observed for all stimuli, but robust phase coherence was preferentially displayed by stimuli with exponents 1 and 1.5. We constructed an auditory processing model to quantify acoustic information on various timescales and correlated the model outputs with the neural results. We show that cortical oscillations reflect a chunking of segments, ?200?ms. These results suggest an active auditory segmentation mechanism, complementary to entrainment, operating on a timescale of ~200?ms to organize acoustic information.
机译：摘要将连续声学流解析为感知单位是对听觉感知的基础。先前的研究已经发现了三角洲和θ的皮质夹带机制（〜1-8次）与语音，音乐和其他准有节奏刺激中的感知单位的形成相关。是否通过常规声学模式被动地夹带了Delta-Theta条带中的皮质振荡，或者在解析声学流中发挥积极作用。在这里，我们使用具有1 / f调制光谱的新型刺激来研究皮层振荡。这1 / f信号没有节奏结构，但由于其宽带调制特征，包含在许多时间尺度上的信息。我们选择了具有不同费用的1 / f调制光谱，其模拟环境噪声，语音，发声和音乐的动态。在经历磁性脑图（MEG）录制时，参与者听取了1 / F刺激并检测到嵌入的目标音调。音调检测性能在不同指数的刺激上变化，并且可以通过使用200Ωms的时间窗口计算的局部信噪比来解释。此外，对于所有刺激观察到令人惊讶的是，对于所有刺激，令人惊讶的是，诱使相干相干性优先通过刺激与指数1和1.5展示。我们构建了一个听觉处理模型，用于量化各种时间尺度的声学信息，并将模型输出与神经结果相关联。我们表明皮质振荡反映了段的块，＆ 200？MS。这些结果表明了一个有源听觉分割机制，互补，以〜200？MS的时间尺度运行，以组织声学信息。

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