On the invariance of cortical synchronization measures across a broad range of frequencies

Neural correlates of higher cognition and awareness are studied based on rabbit electrocorticogram (ECoG) experiments due to W.J. Freeman. Experimental evidence is presented on the onset of synchronization of neural activity across large cortical areas during high -evel cognitive functions and awareness experience. The observed synchronization effect has significant invariance over a broad-range of frequencies, including gamma-, beta-, alpha-, and theta-bands. These results are interpreted in terms of a dynamical system approach to brains operating near the state of criticality.