Title : Does the 1/f frequency scaling of brain signals reflect self-organized critical states
Authors : Claude Bedard, Helmut Kroger and Alain Destexhe
Year : 2006
Journal : Phys Rev Lett
Volume : 97
Pages : 118102
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.