that article is wrong wrong wrong. I hate that article. I've seen it many times, it just sounds like some dumb reporter got into an anechoic chamber and thought it was crazy so he says you will start hallucinating and nobody can stand it for more than 45 minutes. that is plain wrong. I've been in an anechoic chamber to setup equipment to be sound tested, it's a very weird sensation to have the pressure of sound lifted off of you, and to hear your insides working, but everything about that article I loathe.

edit: oh what the hell, I never saw the certificate picture of the world record before, and that chamber is only -9.4dBA when there are plenty now past -12dBA (though I don't know the rating of the chamber I was in)