 In 2014, she published "Irrationality" as part of Polity's Key Concepts in Philosophy series, and was the editor of 2018's "Delusions in Context", an open access collection published by Palgrave Macmillan.In "Delusions and Other Irrational Beliefs", Bortolotti challenges the idea that delusions are not beliefs given that they are irrational.While held to be beliefs in the medical literature, the status of delusions is disputed by philosophers, who have denied that delusions are beliefs on account of their deeply unusual content—such as the delusion that one is actually dead—and because they work differently from paradigmatic beliefs.