Mencius
In the West there was a scientist named Konrad Lorenz (1903 - 1989) who studied animals. He was an ethologist, which means that he carefully studied the behavior of animals and tried to understand why they do the things that they ordinarily do. He saw, for instance, that if baby ducks see a human instead of a duck right after they hatch, they will ever after follow humans and take them to be their parents. He called this kind of learning "imprinting."