Separating Fractal and Oscillatory Components in the Power Spectrum of Neurophysiological Signal

Brain Topography
Haiguang Wen, Zhongming Liu

Abstract

Neurophysiological field-potential signals consist of both arrhythmic and rhythmic patterns indicative of the fractal and oscillatory dynamics arising from likely distinct mechanisms. Here, we present a new method, namely the irregular-resampling auto-spectral analysis (IRASA), to separate fractal and oscillatory components in the power spectrum of neurophysiological signal according to their distinct temporal and spectral characteristics. In this method, we irregularly resampled the neural signal by a set of non-integer factors, and statistically summarized the auto-power spectra of the resampled signals to separate the fractal component from the oscillatory component in the frequency domain. We tested this method on simulated data and demonstrated that IRASA could robustly separate the fractal component from the oscillatory component. In addition, applications of IRASA to macaque electrocorticography and human magnetoencephalography data revealed a greater power-law exponent of fractal dynamics during sleep compared to wakefulness. The temporal fluctuation in the broadband power of the fractal component revealed characteristic dynamics within and across the eyes-closed, eyes-open and sleep states. These results demonstrate th...Continue Reading

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Citations

Dec 17, 2016·Neuroscience and Biobehavioral Reviews·Sirel Karakaş, Robert J Barry
Mar 2, 2018·Annual Review of Biomedical Engineering·Bin HeZhongming Liu
Sep 28, 2018·Human Brain Mapping·Vladimir MiskovicKimberly A Cote
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Nov 30, 2019·ELife·Benjamin James GriffithsSimon Hanslmayr
Jan 14, 2020·Psychophysiology·Beate E Muehlroth, Markus Werkle-Bergner
Jul 29, 2020·ELife·Janna D LendnerRobert T Knight
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Nov 21, 2019·Scientific Reports·Christopher TimmermannRobin L Carhart-Harris
Oct 6, 2020·Cerebral Cortex Communications·Roy CoxJuergen Fell
Nov 25, 2020·Nature Neuroscience·Thomas DonoghueBradley Voytek
Dec 9, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jing LiuGui Xue
Feb 5, 2021·Brain and Behavior·Frigyes Samuel RaczAndras Eke
Feb 18, 2021·Neuron·Leonhard WaschkeDouglas D Garrett
Feb 8, 2020·Trends in Cognitive Sciences·Nora A HerwegMichael J Kahana
Mar 31, 2021·Brain Stimulation·Tiam HosseinianAsif Jamil
Jun 18, 2021·Human Movement Science·Maarten A ImminkIna Bornkessel-Schlesewsky
Jun 17, 2021·Communications Biology·Soren Wainio-ThebergeGeorg Northoff
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Aug 24, 2021·Current Opinion in Biomedical Engineering·Yizhen ZhangZhongming Liu
Sep 14, 2021·Journal of Neural Engineering·Shangen ZhangXiaorong Gao
Oct 15, 2021·ELife·Raphael Vallat, Matthew P Walker

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