A hearing test measuring how the brain processes sound, rather than how well the ears detect it, could help diagnose dementia, according to researchers at the UCL Queen Square Institute of Neurology Dementia Research Centre. How does the test work? The nonverbal ‘brain hearing’ test asks people to identify one sound played into one ear while a different sound is played into the other. The task reveals how effectively the brain separates and interprets competing noises, such as when in a busy env