Journal
TRENDS IN COGNITIVE SCIENCES
Volume 18, Issue 9, Pages 480-487Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tics.2014.04.003
Keywords
scale-free brain activity; power-law distribution; arrhythmic; scale invariance; neural field potentials; brain dynamics; brain oscillations
Funding
- NIH/NINDS
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Brain activity observed at many spatiotemporal scales exhibits a 1 /f-like power spectrum, including neuronal membrane potentials, neural field potentials, noninvasive electroencephalography (EEG), magnetoencephalography (MEG), and functional magnetic resonance imaging (fMRI) signals. A 1 /f-like power spectrum is indicative of arrhythmic brain activity that does not contain a predominant temporal scale (hence, 'scale-free'). This characteristic of scale-free brain activity distinguishes it from brain oscillations. Although scale-free brain activity and brain oscillations coexist, our understanding of the former remains limited. Recent research has shed light on the spatiotemporal organization, functional significance, and potential generative mechanisms of scale-free brain activity, as well as its developmental and clinical relevance. A deeper understanding of this prevalent brain signal should provide new insights into, and analytical tools for, cognitive neuroscience.
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