I can confirm what's been said in this thread.
Just got back from a run. My headphones died halfway through. I immediately fell to the ground and couldn't move without my music. I guess my brain was so used to having music on my runs that it forgot how to move without music.
However, then the sun came out and I was able to move again. Wow - thanks guys all this bro science was so helpful - I will never run with headphones again! I don't want to forget how to move when it comes time to race!