I've learned to be direct with my INTP husband. If I want acknowledgment or appreciation for something I make sure to tell him (cause I've learned that hints do not work ).
Normally though, I can tell if he appreciates something, little differences in body language and vocal tone I guess. Occasionally he'll say something, probably more likely to be physically affectionate though.
I really like the physical affection, but only from him.
A hug from anyone else is weird weird weird.
(online hugs are good though! I wish real life hugs were more like that.)