"Pavlov's dog" originally refers to Russian psychologist Pavlov's conditioned reflex experiment with dogs, but now it is extended to describe a person who often does things according to conditioned reflex without thinking, but has resistance to logical speculation.
Simply put, it is to describe people who have no brains to talk or do things. According to Pavlov's dog experiment, contemporary young people derive the online language Pavlov youth self-mockery, also known as Pappy youth, which refers to those professionals and student parties who have conditioned their work and study. When they encounter situations related to work and study, they will subconsciously react.