Imagine 2 scenarioes. One, youre on a train and have to be there for the rest of your life. The train is noisy and you will have to live with the sound of engines, honking etc. for the rest of your life. Two, you have tinnitus with the exact same sounds and sound level. The consequenses for these 2 scenarioes are almost equal. Only difference i can thing of is that in scenario 1, you can cover your ears for a while and block some of the sounds out, and the fear of thinking about wheter the sounds will get worse. However, I believe the reaction to most of us would be quite different in the 2 scenarioes. Our reaction in the 2nd scenario would be more dramatic, maybe most of us wouldnt even think much about the noise issue in scenario 1. I believe pretty much everyone would be able to habituate to the noise after a while in scenario 1 and certainly think about the noise way less compared to scenario 2. Most of us would think of the sounds in the beginning as annoying, but none of us would obsess about them and fear them as some would in scenario 2. And this is exactly why some of us cant habituate, (disregarding H and pain related T). Our mind binds us and fills us with fear and makes out brains focus on the sound. The fact that we know that the sound is in our heads keeps us from natural habituation. If we all could forget about the source of the sound and imagine being on that train, I think we would be one step closer to habituation.