Modality-specific tracking of attention and sensory statistics in the human electrophysiological spectral exponent.
Modality-specific tracking of attention and sensory statistics in the human electrophysiological spectral exponent.
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DOI：
10.7554/elife.70068
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发表时间：
2021-10-21
期刊：
影响因子：
7.7
通讯作者：
Obleser J
中科院分区：
文献类型：
--
作者：
Waschke L;Donoghue T;Fiedler L;Smith S;Garrett DD;Voytek B;Obleser J
电生理学大脑活动的一个标志是其1/f样频谱-功率随频率增加而降低。这种“滚降”的陡度近似于谱指数，其在侵入性记录的神经群体中反映了兴奋性与抑制性神经活动的平衡（E：I平衡）。在这里，我们首先确定非侵入性脑电图（EEG）记录的频谱指数对一般（即，麻醉驱动的）E：I平衡的变化。建立在EEG频谱指数作为一个可行的标记E：I，然后我们证明了其敏感性的选择性注意力的焦点在EEG实验中，参与者检测目标，同时视听噪声。除了这些内源性的变化E：I平衡，EEG频谱指数在听觉和视觉感觉皮层也跟踪听觉和视觉刺激的频谱指数，分别。个人的程度，这种选择性刺激大脑耦合的频谱指数预测的行为表现。我们的研究结果突出了1/f样神经活动中包含的丰富信息，为以前认为在非侵入性人类记录中无法访问的各种神经过程提供了一个窗口。
A hallmark of electrophysiological brain activity is its 1/f-like spectrum – power decreases with increasing frequency. The steepness of this ‘roll-off’ is approximated by the spectral exponent, which in invasively recorded neural populations reflects the balance of excitatory to inhibitory neural activity (E:I balance). Here, we first establish that the spectral exponent of non-invasive electroencephalography (EEG) recordings is highly sensitive to general (i.e., anaesthesia-driven) changes in E:I balance. Building on the EEG spectral exponent as a viable marker of E:I, we then demonstrate its sensitivity to the focus of selective attention in an EEG experiment during which participants detected targets in simultaneous audio-visual noise. In addition to these endogenous changes in E:I balance, EEG spectral exponents over auditory and visual sensory cortices also tracked auditory and visual stimulus spectral exponents, respectively. Individuals’ degree of this selective stimulus–brain coupling in spectral exponents predicted behavioural performance. Our results highlight the rich information contained in 1/f-like neural activity, providing a window into diverse neural processes previously thought to be inaccessible in non-invasive human recordings.
影响因子：
3.7
作者：
Garcia-Lazaro JA;Ahmed B;Schnupp JW
通讯作者：
Schnupp JW