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We seek general principles of the structure of the cellular collectiveactivity associated with conscious awareness. Can we obtain evidence forfeatures of the optimal brain organization that allows for adequate processingof stimuli and that may guide the emergence of cognition and consciousness?Analysing brain recordings in conscious and unconscious states, we followedinitially the classic approach in physics when it comes to understandingcollective behaviours of systems composed of a myriad of units: the assessmentof the number of possible configurations (microstates) that the system canadopt, for which we use a global entropic measure associated with the number ofconnected brain regions. Having found maximal entropy in conscious states, wethen inspected the microscopic nature of the configurations of connectionsusing an adequate complexity measure, and found higher complexity in statescharacterised not only by conscious awareness but also by subconsciouscognitive processing, such as sleep stages. Our observations indicate thatconscious awareness is associated with maximal global (macroscopic) entropy andwith the short time scale (microscopic) complexity of the configurations ofconnected brain networks in pathological unconscious states (seizures andcoma), but the microscopic view captures the high complexity in physiologicalunconscious states (sleep) where there is information processing. As such, ourresults support the global nature of conscious awareness, as advocated byseveral theories of cognition. We thus hope that our studies representpreliminary steps to reveal aspects of the structure of cognition that leads toconscious awareness.

Consciousness as a global property of brain dynamic activity