What causes a good proportion of the human population (including myself) to be irritated by the sounds of 'screeching' elastics? Such as that of childrens' fingers rubbing against a balloon. It seems that we are sorted into 2 categories, either you hate the sounds, or they don't bother you whatsoever. Children seem to be more resistant to the sounds as well. Does this have something to do with our ear structures, possibly as you grow older the inner ear changes in a way that makes you susceptible to falling into the 'hate it' category? Or possibly the brain changes in such a manner that it just doesn't accept those noises as beautiful music anymore? Thoughts?