"Notice that the attention just seems to go where it does.While typing out a reply to this post,the phone may ring, do "you" turn your attention to it,or is there simply the presence of the sound. For example, how impossible it would be if there was the presence of a sound, but "you" had to do something to hear it? The sound is just present,"you" didn't have to do anything to hear it - did "you?"
http://www.ruthlesstruth.com/arena/viewtopic.php?f=3&t=1456