Does the 1/f frequency scaling of brain signals reflect self-organized critical states?

@article{Bdard2006DoesT1,
  title={Does the 1/f frequency scaling of brain signals reflect self-organized critical states?},
  author={Claude B{\'e}dard and Helmut Kr{\"o}ger and Alain Destexhe},
  journal={Physical review letters},
  year={2006},
  volume={97 11},
  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… 

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