Thank you.
I had a slightly different understanding of those terms. The distinction between a reinforcer and a punishment I'm with you. I believe a negative reinforcer is something that the animal wants to stop and produces the desired behavior - so a horse's bit is a negative reinforcer, because the horse turns its head to relieve the pressure in its mouth.
I believe punishments come after the act also. So, I THINK taking food out of Thor's mouth is a "positive punishment" - I am adding an unpleasant experience to reduce his desire to run away and eat his find.
I think. I've never been completely clear on the terminology.