I am definitely keeping my eye on this one. About 30 years ago I was hit by a car (t-boned whilst on a 10 speed, no helmet). The only permanent injury was slight hearing loss and tinnitus in my right ear. Mostly I heard it in quiet settings (I never heard for the two years I lived in Toronto, for example), though its volume varied occasionally (usually with fatigue).<p>A few years ago, I developed "left to centre" tinnitus for unknown reasons (idiopathic, as the docs say). The only time I don't hear it is at a loud concert (ironic, eh?).<p>While I've grown accustomed to it, I do wonder whether it will get worse as I age (the half a century mark looms).<p>Psychologists use the term adaptation to refer to our senses getting used to phenomena of little interest, e.g., we feel the weight of our clothes when we dress, but soon they "disappear". Likewise certain smells, etc.<p>This sounds like a form of induced adaptation. A very excited one.