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That converts sound to nerve impulses and then sends them to the brain. with no cocleas, a cochlear implant would be no help. from the start tommy and danielle learned sign language. they figured it would be the only way caden would ever communicate. then danielle heard of another option. >> it was random. i just talking to a friend and she was like, i think that they're doing abis in the u.s. now. >> so abi stands for auditory brain stem implant. the main use for this is for kids born without nerves to the ears. so i like calling it a bionic ear. >> reporter: dr. mark kreeger is a pete trick ...

Parts. a microphone and transmitter on the head converts sounds from the outside world into electrical signals. those signals are transmitted to the internal receiver made of electrodes, implanted on the brain stem. the auditory neurons are stimulated directly in the brain, bypassing the inner ear completely. >> by putting this electrode directly into the hearing centers of the brain it actually is taking stuff and using the brain the way it's designed to work. and the brain itself in a very young child is able to grow and develop around this implant. >> reporter: caden was chosen as the fourt...