a hypothesis that conscious experiences arise from massive neuronal activity in the thalamocortical system of the brain, particularly when interactivity in a dynamic core of neurons reaches a high level. Complexity is a mathematically defined measure of neuronal integration and differentiation. [proposed by Italian–U.S. neuroscientist Giulio Tononi (1960– ) and U.S. neuroscientist Gerald M. Edelman (1929–2014)]