Fox News viewers who were paid to watch CNN for 30 days eventually became more skeptical and less likely to buy into fake news, according to a new study.

The study found changes in attitudes and policy preferences about COVID-19, evaluations of then president Donald Trump and Republican candidates as well as elected officials.

The researchers concluded that this is an effect in part of “partisan coverage filtering”, wherein partisan outlets selectively report information, leading viewers to learn a biased set of facts.