Belting out a few notes on key might take years of practice, and perfect pitch the right genetics, but when it comes to something as simple as telling noise from symphony, speech from music, all ears are created equal -- or so it was once thought.

But in a new study, scientists have found that the left and right ears process sound differently. From birth, the right ear responds more to speech, while the left ear is more attuned to music, according to the study, published in Science on Sept. 10.

The findings could have substantial implications for deaf people who need cochlear hearing devices, which are implanted in only one ear, said Dr. Yvonne Sininger, a visiting professor of head and neck surgery at the David Geffen School of Medicine at the University of California, Los Angeles and lead author of the study.

While the idea that the left and right ears are not identical is new, scientists have known for decades that the two sides of the brain sort out sound in different ways. Speech is processed primarily in the left hemisphere of the brain, while music is handled largely by the right, hence the tendency to associate creativity with "right-brain" dominance and analytical thinking with "left-brain" supremacy.