How the brain tunes out odors

Immersed as we are in a sea of smells, how is it we're not continually overwhelmed with fair or foul odors until we actively inhale a rose or sniff the milk for a hint of sourness?
University of California, Berkeley, neuroscientists have scanned the brains of people sniffing odors and found an answer.

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<p><a href="http://www.physorg.com/news2534.html">How the brain tunes out odors</a></p> <p> Immersed as we are in a sea of smells, how is it we're not continually overwhelmed with fair or foul odors until we actively inhale a rose or sniff the milk for a hint of sourness? <br>University of California, Berkeley, neuroscientists have scanned the brains of people sniffing odors and found an answer.</p>