How much it raise or if it raises may depend on where it's at already. I have gained 1 in both perception and dex which started at 70. I lost 1 in str which started at 80, lost one in spirit which started at 25 and lost one other, but I forget which off hand
I've lost 3 points. 1 in each - Str, Charm and Spirit. I've gained nothing. I've been working on leatherworking, weaponcrafting and terraforming. I don't understand how spirit goes down when one of it's main "skills" is experience gain, seems like if you're gaining xp it should stay level. I wish this new list of how attributes relate to skills would have been out a while back, I would have built this last character a little bit differently.
I lost a point in str and gained a point in dex when I was grinding toolcraft. Now I am griding weaponcraft and gained a point in str. It happened when I was carrying a load of medium wood handles back to camp.