When I was in my late teens I went to a concert which was way too loud - for a few years after that incident I could hear something akin to modulation distortion if the sound was loud enough - a sort of low ringing like what you hear if you spin a suitcase wheel using your hand.
It was unpleasant, but surprisingly helpful in identifying pitch, because the distortion would just sound differently depending on pitch - I associated it with a few notes and could roughly identify them - especially the lower ones (E, D and C# specifically).
The effect faded over time and now I can't do it any more.
In any case, non-newtonian fluids exhibit such distortion and the body is full of them(most notably blood). I wonder if they play any role in this?