Grayson Clamp was born deaf, missing a choclear nerve. A new technology, however has made it possible to hear his father's voice for the first time.

(Boy turning)

This moment was the result of a microchip placed in the three-year-old's brain by doctors at the University of North Carolina. Because Grayson doesn't have a cochlear nerve for an implant to attach to, the implant was positioned on his brain stem.

Grayson - the first child in the United States to receive the brain implant - will require several years of therapy to improve his hearing and speech.