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  Complex Times for Earthquakes, Stocks, and the Brain's Activity

Kayser, C., & Ermentrout, B. (2010). Complex Times for Earthquakes, Stocks, and the Brain's Activity. Neuron, 66(3), 329-331. doi:10.1016/j.neuron.2010.04.039.

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Kayser, C1, 2, 3, Author              
Ermentrout, B, Author
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1Research Group Physiology of Sensory Integration, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497808              
2Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
3Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: 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 beta 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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 Dates: 2010-05
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.neuron.2010.04.039
BibTex Citekey: 6596
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Title: Neuron
Source Genre: Journal
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Publ. Info: Cambridge, Mass. : Cell Press
Pages: - Volume / Issue: 66 (3) Sequence Number: - Start / End Page: 329 - 331 Identifier: ISSN: 0896-6273
CoNE: https://pure.mpg.de/cone/journals/resource/954925560565