How brains filter the signal from the noise

By Bethany Brookshire, 17:52 PM April 29, 2014

When you are waiting with a friend to cross a busy intersection, car engines running, horns honking and the city humming all around you, your brain is busy processing all those sounds. Somehow, though, the human auditory system can filter out the extraneous noise and allow you to hear what your friend is telling you. But if you tried to ask your iPhone a question, Siri might have a tougher time. 

A new study shows how the mammalian brain can distinguish the signal from the noise. Brain cells i...

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