I'm sorry, is this showing a _causal_ relationship between political bias and perceptions of reality? The headline and article make it sound like that, but it c

I'm sorry, is this showing a _causal_ relationship between political bias and perceptions of reality? The headline and article make it sound like that, but it could just as easily be that your perception of reality causes your political bias. Or that some other thing causes both of them. I can't see the paper to be sure because it's behind a paywall.