Tinnitus is a chronic ringing or buzzing in the ears. Trouble is, it is invisible and up until now it could not be measured by any device. Now researchers at the University of Illinois have uncovered evidence that chronic tinnitus is associated with changes in certain networks in the brain and those changes cause the brain to stay more at attention and less at rest. The researchers used functional MRI to look for patterns across brain function and structure and found that tinnitus is in a region of the brain called the precuneus. The precuneus is connected to two networks in the brain, the dorsal attention network (active when you are paying attention to something) and the default mode network (active when you are at rest taking care of background functions). When the default mode network is on, the dorsal attention network is off, and vice versa. The research found that, in patients with chronic tinnitus, the precuneus is more connected to the dorsal attention network and less connected to the default mode network. And as severity of the tinnitus increased, so did the observed effects on the neural networks. The results imply that tinnitus patients are not truly at rest, even when resting. Now researchers will pursue what causes the onset of tinnitus and how it affects different groups of people.