Eli5: Why do we puke when we *see* something disgusting, although there’s no sign it has actually entered or interfered with our body?

Question

Eli5: Why do we puke when we *see* something disgusting, although there’s no sign it has actually entered or interfered with our body?

In: Biology

Answer 1

My understanding is that is is also a learned behavior. We see it as the reaction we should have in cartoons, movies, books and phrases. Thus we do it.