Neuroscience: The default brain network - humming along while we're idle

Here's an interesting summary on the default network in the brain, the one that's active when we aren't thinking about anything. (Tina Hesman Saey, "You are who you are by default" ScienceNews, July 18, 2009) Difficulty maintaining the network intact may be a factor in Alzheimer syndrome and schizophrenia.