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Sound engineers are trying to figure out how people can focus in a single speaker while tuning out other talkers in a t crowded, noisy room. This is known as the "cocktail party effect."

"Watching" the brain in action with fMRI machines reveals that the representation of speech in the cortex does not reflect the entire external acoustic environment but instead just what we really want or need to hear.
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Everywhere you go these days you overhear conversations taking place on cell phones and see people wearing headphones moving to music only they can hear. All this is leading to old ears on young bodies. Audio expert Robert Novak says, “We’re starting to see hearing loss in young adults that we expect to diagnose in middle-aged adults. This loss is often self-induced and may be related to young people’s exposure to amplified sound and use of personal listening systems, such as cell phones and portable music devices. The damage can be temporary or permanent.” The cause: damaged ear hairs.
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