Surgery allowed a deaf boy to hear his father's voice for the first time.
Doctors in North Carolina recorded 3-year-old Grayson Clamp's reaction to what he heard.
He was born without a nerve that carries signals from his ears to his brain. A device now allows his brain to process sounds.
"We don't know exactly what he hears, if he hears everything we hear. Some of what we hear, his brain is still trying to organize itself to use sound," said Nicole Clamp, the boy's mother.
Grayson will undergo years of speech and hearing therapy.
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