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reporter: his audologist explained how much he has to learn and how difficult it will be. he doesn t even realize the difference between the noise maker shaking and the sound of his mother s voice. until he can learn to discriminate those things, it s a pretty scary experience. reporter: unlike a traditional hearing aid, the cochlear implant sends coded sound waves into the hearing nerves. back in the testing room mom finally sees david s fleeting but unmistakable reaction. david. david. you hear me. it s going to change his life completely. i already see it. reporter: david s younger brother joseph with similar hearing and behavioral problems will be evaluated for an implant next giving this whole family the promise of a future full of speech, laughter and music. they ll all be able to hear together. what a sweet story. very cool. the reaction amazing. ....