Whatdya say?

Josiah passed his hearing test with near crystal clear precision. While he wasn't too thrilled about the ear muffs, he managed to stay still for the audiologist long enough to get a passing grade.

Forgive the lack of technical details here, but basically, they placed one sensor on his octive nerve, one on his forehead to measure brain activity, and one grounding wire on his shoulder. Then, covering his ears with super-cool headphones, they played different sounds and measured his auditory brainstem response to the sounds.
Good job, Josiah!