 For example, delusions are often maintained despite overwhelming counter-evidence, or are not reacted to in the way one would expect given their content.After setting out the background to the question, Bortolotti explores whether the procedural irrationality of delusions—the fact that they do not rationally relate to the other intentional states of the agent—justifies the denial that they are beliefs.She denies that it does, given that many paradigm beliefs display failures of procedural rationality.