Comment by aeternum

It seems to me that this is the purpose of nightmares. I especially noticed this after having kids. They are not by default scared of snakes and such but if they see a nature documentary of a snake biting something or even a cartoon bad guy, it's enough to trigger bad dreams which reinforce the fear and it's far stronger the next day.

IMO this is under-appreciated in current AI models. RL is not very effective in avoiding crocodiles for example, by the time like 5 of your tribe-mates are eaten it's far too late. You need some mechanism that ensures the danger is learned after just a single incident.