This is genetic and he definitely inherited this from Brian's side of the family. Brian's grandpa does the same exact thing when he is working...except grandpa doesn't drool like Jamison. Brian and I find this common trait incredibly endearing.
He knows the remote has something to do with making that car go. He just couldn't quite figure out how to do it.
And even after he figured it out he still kept his tongue out as he maneuvered the car around the room.