Welcome to you, Gasman.
I wish I had something enlightening to add to the marvelous info. above, but I'm afraid this time I'm just jabbering.
Sweet WO'N, good likeness to the word motivate. I have to say that Dr. Bill's post and sjm's response (you always catch on to things, don't you?) were so incomprehensible to me that I just passed right on under them--until I read WW's post and Faldage's response. Faldage, you and dxb both beat me to what I woulda said if I'd gotten here in time! Yes, a reward is after the fact. However, I think the offer of a reward can be an incentive. (Hey--could a deterrent to doing something be a decentive? You know, like the music at the beginning of a church service is the introit and the music at the end is the detroit?)
[dreamy-eyed]Incinere...yes, eta--think of miserere. But this would have to be happy music.