I know a factory worker whose tinnitus sounds like the machines at work. Mine is a high pitched whine. The rushing one you have, I have heard about that before.
here are some sounds - mine is very mild and unchanging pitch. Some of these frighten me.
http://www.rnid.org.uk/information_r...it_sound_like/
Anyone can experience a mild tinnitus.
I don't recommend training your brain to do this - so I recommend you never so this but....
...if you wanted to simply at night when the room is dark and there is no sound.. concentrate on the lack of sound.....should only take seconds...there it is..possibly.
http://www.sciencedaily.com/releases...0101093825.htm
Our brains are programmed by our DNA to protect ourselves and that means hearing danger.
In modern life many sounds we are programmed to hear (this is the theory) are not the same nor the same pitch. Modern sounds are deep (oversimplistic but it will do) such as music, construction, cars etc. Higher pitched sounds such as rain, running river water, the beach and particularly birds are absent or not going all the time or enough of the time.
In nature all is quiet when things are going to go bad.........as I said before some experts believe there may be the "flight or fight" thing involved in this.
Hope I am not considered to be waffling.