The fact that they "controlled" for genetics using polygenic scores already is a strong sign of low quality research. Polygenic scores are powerful, but they contain very large amounts of noise compared to the true genetic effects. Controlling for genetics using them is like controlling for income by asking whether the respondents own a Porsche. Also, be aware that Scientific Reports is, if not quite a predatory jour…
>If you wanna believe that your hours on COD have made you a genius, go ahead, I won't stop you. Just don't imagine that this research proves it. You know there are more video games styles than FPS right? Strategy games teach patience and discipline, EVE online teaches economics, even the much dismissed 'mindless' fps teach teamwork. I think it's likely that at least some games do increase intelligence relative to ot…
I think this is probably more key than you think.
Mindlessly watching junk food TV is not going to help you a lot. It's not very "nutrient rich" (to continue the expression) in terms of knowledge gained.. but you will probably gain some.
Watching documentaries and, crucially, actively watching them is probably very good in terms of how much you learn.