# Abstract Misinformation interferes with citizens' beliefs and behaviour posing a harm to society. Although frequently associated with false or misleading news, misinformation is also present in political discourse. In this study, we will experimentally investigate how partisanship and cognitive reflection are associated with belief in false statements made by Argentinian politicians. Participants will classify fact-checked political statements as either true or false, complete a cognitive reflection test, and report their voting preference. Drawing on [Signal Detection Theory](https://en.wikipedia.org/wiki/Detection_theory) and hierarchical Bayesian statistical modelling, we will infer the effect that partisanship and cognitive reflection have on truth discernment and overall belief. Based on existing literature, we make four predictions, each mapping onto a single model coefficient. Results will further explain how belief in political statements comes about.