Its basically a resistance thing. It makes you get that feeling when you KNOW nothing is coming, but as it gets louder, you feel that something is anyway, and you quickly make a hasty retreat. I get that allot. Its like when I heard a creepy sound while putting a hazmat suit in 914, and I thought it would suddenly start walking towards me and try and kill me. I bolted out of there and never came back.
On my recent mod i'm creating, I have changed the sound so the atmosphere of the sound just makes you start looking behind you and just praying that nothing will come.
Its funny how a simple sound can add so much atmosphere to the game.