Journal
NEURON
Volume 66, Issue 3, Pages 353-369Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2010.04.020
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Funding
- NINDS NIH HHS [P50 NS006833-430032, P50 NS006833] Funding Source: Medline
- PHS HHS [06833] Funding Source: Medline
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Scale-free dynamics, with a power spectrum following P alpha f(-beta), are an intrinsic feature of many complex processes in nature. In neural systems, scale-free activity is often neglected in electrophysiological research. Here, we investigate scale-free dynamics in human brain and show that it contains extensive nested frequencies, with the phase of lower frequencies modulating the amplitude of higher frequencies in an upward progression across the frequency spectrum. The functional significance of scale-free brain activity is indicated by task performance modulation and regional variation, with 13 being larger in default network and visual cortex and smaller in hippocampus and cerebellum. The precise patterns of nested frequencies in the brain differ from other scale-free dynamics in nature, such as earth seismic waves and stock market fluctuations, suggesting system-specific generative mechanisms. Our findings reveal robust temporal structures and behavioral significance of scale-free brain activity and should motivate future study on its physiological mechanisms and cognitive implications.
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