daddy yes, hear. jenna: we said a new implant, but it s actually been around, this technology, for more than a decade. little grayson is one of the first children to receive it, and we re joined by a doctor who has performed this type of surgery. he s from columbia university medical center and rushed down to join us so, doc, it s great to see you can. i know you re a doctor, but when you see that video, what goes through your mind? amazing, just amazing. i mean, here s a child who s never heard before, never heard his parents before, never herald a sound before heard a sound before, and he suddenly lights up. jenna: we still don t know what he s hearing, right? there s a mystery about what this device actually produces inside. exactly. we don t know whether he s hearing words or sounds. it ll take them some time to figure out exactly what he s hearing in the first place. jenna: tell us a little bit about what is this implant? well, okay. so normally when we hear, we hear i