I don't know much, but at the Nebraska Pond Boss conference held a couple of weeks ago, Bob Lusk said something to the effect that "You can't feed the instinct out of them". In other words their instinct is to grab food if they see it swimming by.
Now I don't know if that applies the same to a live minnow as it does to a spinner bait.
I hope Bob read this and corrects me if I am wrong.