Phys. Rev. Lett. 97, 118102 (2006) [4 pages]Does the 1/f Frequency Scaling of Brain Signals Reflect Self-Organized Critical States?Received 27 March 2006; published 13 September 2006 Many complex systems display self-organized critical states characterized by 1/f frequency scaling of power spectra. Global variables such as the electroencephalogram, scale as 1/f, which could be the sign of self-organized critical states in neuronal activity. By analyzing simultaneous recordings of global and neuronal activities, we confirm the 1/f scaling of global variables for selected frequency bands, but show that neuronal activity is not consistent with critical states. We propose a model of 1/f scaling which does not rely on critical states, and which is testable experimentally. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.118102
DOI:
10.1103/PhysRevLett.97.118102
PACS:
87.19.Nn, 02.50.Ey, 05.40.−a, 89.75.Da
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