He knows he is getting better and he needs the affirmation of you, his friends, as well. He can't cry or laugh on the outside, but he experiences emotions just like always. In fact, one of his favorite things is for me to read jokes to him from the internet. So don't let this injury keep you away from Jason. Don't worry about calling.
Somebody is here all the time.
Other than that, we are here. So please, do Jason a favor and let him know your are thinking about him. And I bet you will get about as much out of the visit as he does. Jason is a living lesson of that principle.