Terrence J. Sejnowski
"The brain is not just a computing device: It is also a powerful communication network, with the total bandwidth of signaling between neurons comparable to that of the entire World Wide Web. How is all the traffic between brain areas regulated? How does the brain store and retrieve information?
The answers to these questions are being sought in the temporal coherence of brain signals on a global scale. Curiously, brain states with the highest coherence are found during sleep".