As our day goes on we hear many noises that are not important to us. At some point, this noises will become interesting, annoying or not important at all. But when you leave in an apartment building with other neighbors living on the following floor of your apartment sometimes we find ourselves being annoyed by noises which are not even important to us. How can we pay attention to a noise if it is not a signal, on the contrary you wish not to hear that noise. For example, while I am trying to complete my class assignments right now, my neighbor on the fifth floor seems to be throwing all his/her furniture on the floor. On the other hand, I can say that I am used to noise. There is a construction right next to my window in which they make a lot of noise at 7:00 AM but somehow this noise is not bothering me. What I am trying to say, is there a signal on the noise that my neighbor is making right now but not on the noise of the construction?