What Is the Default Mode Network?

You might be the laziest person on the planet, but your brain never rests. So what does it get up to when you’re more or less checked out? In the 1930s, Hans Berger, a German psychiatrist who had recently invented the electroencephalogram (EEG), suggested that our brains are always active, even when we don’t seem to be doing much with them. Few people took the idea seriously at the time (maybe because Berger had spent much of his career trying to prove telepathy,