operation. dr. eric wilkinson was another. >> going to take a look at the implant. his scar is actually really nicely healing up. >> dr. wilkinson is one of the lead investigators on this abi trial. children's hospital of los angeles and the university of southern california aren't the first to be performing auditory brain stem implants. surgeons in italy have been doing this procedure for more than ten years. but this trial is the only fda approved one in the united states. funded by the national institutes of health. >> you want that? you can have -- >> they are also focusing on one particular age group. >> good job, buddy. >> we know from cochlear implant studies that the earlier that the auditory system in the brain can be stimulated, the better the children will do. in our study, we actually have the ages of two through five.