From Sharon Begley at Newsweek: When someone is just lying still and the mind is blank, neurons are chat­tering away like Twitter addicts. The very idea of default activity was so contrary to the herd wisdom that when Marcus Raichle of Wash­ington Univer­sity in St. Louis, one of its discov­erers, submitted a paper about it, a journal rejected it. The brain is in default mode when we stare into space, sleep, succumb to anes­thesia, make our mind a blank while sitting motion­less. This default activity is no mere murmur in the back­ground of a loud symphony, consuming 20 times as much energy as the conscious life of the mind, including thinking, feeling, and using our senses — the mental acts captured by the brain imaging that so entrances the public. “The brain at rest is not at rest,” says neuro­sci­en­tist Alvaro Pascual-Leone of Harvard. “Even more impor­tant, this resting activity is not random, but is well orga­nized and consti­tutes the bulk of the brain’s activity.” · Go to Why your brain never really rests →