A shipping clerk begins to think he’s been given a secret task of geopolitical significance. A government employee believes that descriptions of a certain actor in the newspaper are actually about her ...

Beliefs remain fundamental to our behavior and identity, but are not well understood. Delusions, on the other hand, are fixed, usually false, beliefs that are strongly held, but not widely shared. In ...

Delusions of grandeur, also known as grandiose delusions (GDs), are a type of delusion, or false belief. People who experience delusions of grandeur may believe they are famous, God-like, wealthy, ...

In contrast, relatively little research has focused on how delusions are sustained or fixed (see refs. 12, 13 for examples). This is surprising, given that the fixity of a delusion has long been ...

Multiple measures of decision-making under uncertainty (e.g. jumping to conclusions (JTC), bias against disconfirmatory evidence (BADE), win-switch behavior, random exploration) have been associated ...

Around the year 1400, the French king Charles VI began to exhibit a number of disturbing behaviors that eventually earned him the nickname "Charles the Mad." Among these behaviors, he refused to let ...

Erotomania, also known as De Clérambault’s syndrome, is a rare psychiatric disorder characterized by a delusional belief that another person, often of higher social status or celebrity status, is in ...

The rapid rise of generative artificial intelligence is fuelling an emerging mental health worry: “AI psychosis.” Microsoft’s head of AI, Mustafa Suleyman, said he is increasingly troubled by reports ...