Dr. Giulio Tononi presents his Integrated Information Theory of consciousness. A system with a particular combination of high differentiation with high integration in its connectivity will exhibit dynamics with a large value of PHI. This happens to be the connectivity allowing for maximal information integration. This video dates from the university of Wisconsin, circa 2007.
New York Times Article: nytimes.com/2010/09/21/science/21consciousness.html?pagewanted=all&_r=0