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<br />Background Noise <br /> <br />· Existing traffic noise acts as background noise <br /> <br />· "Novelty detector neurons," as researchers call <br />them, quickly stop firing if a sound or sound <br />pattern is repeated. They will briefly resume <br />firing if some aspect of the sound changes. The <br />neurons can detect changes in pitch, loudness <br />or duration of a single sound and can also note <br />shifts in the pattern of a complex series of <br /> <br />so un d s. (Source: How the Brain Tunes Out Background Noise. LiveScience Staff. posted: 02 December 2005) <br />