There are two or three hypotheses. One is that if you're prone to addiction in your brain, whether it be alcohol or another substance, maybe the biological vulnerability thot alcohol translates to a biological vulnerability to video game adiction. So there is a biological component, butthat they seem to be specific to the substance. And so the individuality, it turns out, is born n in nero science. Euphoria, like, what which substance creates a sense of euphoria in our brain is actually dependent on our biology.