Auditory selective attention is our filtering of sounds to what we do and don't listen to. Scientists at the University of Washington performed a study that confirmed that it's more difficult to tune in to a single sound stream when the number of streams increases. But the study brought them closer to developing an auditory brain-computer interface (BCI), a device that reads brain activity to allow users to control computer or machines such as wheelchairs.
http://www.sciencedaily.com/releases/2012/05/120508152007.htm
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