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- Title
Alpha Oscillations Reduce Temporal Long-Range Dependence in Spontaneous Human Brain Activity.
- Authors
Becker, Robert; Van de Ville, Dimitri; Kleinschmidt, Andreas
- Abstract
Ongoing neural dynamics comprise both frequency-specific oscillations and broadband-features, such as long-range dependence (LRD). Despite both being behaviorally relevant, little is known about their potential interactions. In humans, 8 -12 Hz α oscillations constitute the strongest deviation from 1/f power-law scaling, the signature of LRD. We postulated that α oscillations, believed to exert active inhibitory gating, downmodulate the temporal width of LRD in slower ongoing brain activity. In two independent "resting-state" datasets (electroencephalography surface recordings and magnetoencephalography source reconstructions), both across space and dynamically over time, power of u activity covaried with the power slope < 5 Hz (i.e., greater α activity shortened LRD). Causality of α activity dynamics was implied by its temporal precedence over changes of slope. A model where power-law fluctuations of the « envelope inhibit baseline activity closely replicated our results. Thus, α oscillations may provide an active control mechanism to adaptively regulate LRD of brain activity at slow temporal scales, thereby shaping internal states and cognitive processes.
- Subjects
NEUROSCIENCES; OSCILLATIONS; BRAIN physiology; BRAIN function localization; NEURAL development
- Publication
Journal of Neuroscience, 2018, Vol 38, Issue 3, p755
- ISSN
0270-6474
- Publication type
Article
- DOI
10.1523/JNEUROSCI.0831-17.2017