I must confess I don't really understand the way 'incentive' is used in [deleted]'s post. Isn't an incentive usually a reward you use to get someone to do something? When I give my cat a treat I to get her cat to come when I call her, the treat is the incentive. I didn't create the incentive - the cat already liked the treats. All I did is get her to associate me calling her with getting a treat.