What is a greater motivator fear or joy?

Question

I am not talking about motivation in goodness or badness, I am just talking about the effect and then reaction.

(yes it should be in R&S, and I will show you why later)Ankaboot

Answer 1

(All right, I'll take the "bait!")

Joy is.  Fear is more of a paralyser than a motivator.

Answer 2

Fear, it keeps the cattle's from straying away.

Answer 3

Fear is effective; joy is reaction-wise.