I remember reading about researchers trying to understand what triggered baby birds to cry for food when the mother bird came back to the nest. They found they could make a red stick for the head and a yellow stick for the beak, amd the babies would yell just as loudly for food.What stuck with me is that they found that by elongating the yellow stick, the baby birds would yell even harder than when their mother was there. In other words, are instincts amd impulses are imprecise and can be manipulated.
This is not a new thing, though. In some ways, this is something art has long manipulated - no love is more tragic than Romeo and Juliet's, for example.