Subtle facial gestures linked to the body's fight-or-flight response could be used to help diagnose people with tinnitus , a new study says. Video recordings showed that people with tinnitus experienced facial twitches and pupil dilation in response to certain sounds, researchers reported April 30 in the journal Science Translational Medicine . This is the first time researchers have found a marker that could be used to identify tinnitus in people suffering from the hearing problem, researchers