BACKGROUND Delusion is one of the most intriguing psychopathological phenomena and its conceptualization remains the subject of genuine debate. Claims that it is ill-defined, however, are typically grounded on essentialist expectations that a given definition should capture the core of every instance acknowledged as delusion in the clinical setting. OBJECTIVE In this paper, we attempt to show...

The pattern of delusions in a cross-cultural hospital population was studied. It was found that there were cultural differences in persecutory, grandiose and religious, and sexual and fantastic delusions, accounted for mainly by the relatively higher frequencies in the African and West Indian cultural groups. These phenomena can be understood in terms of the cultural backgrounds of these groups...

The hypothesis that persecutory delusions function to enhance self-esteem implies that patients will show normal explicit, but low implicit self-esteem. As evidence for this has been inconsistent, our study assessed delusional state, explicit and implicit self-esteem and depression in a large sample (n=139) of schizophrenia patients with acute persecutory delusions (n=28), patients with remitte...

Shared psychotic disorder develops in an individual in the context of a close relationship with another one who has an established delusion that he/she also believes. It is classified within paranoid disorder. Herein, we present a case of two sisters with their mother. The elder sister was the origin of paranoid delusion. Her delusion was with a dentist who tries his best to prevent her for mar...

Modern psychiatric epidemiology researches complex interactions between multiple variables in large datasets. This creates difficulties for causal inference. We argue for the use of probabilistic models represented by directed acyclic graphs (DAGs). These capture the dependence structure of multiple variables and, used appropriately, allow more robust conclusions about the direction of causatio...

We proceed to describe a model for the formation and maintenance of polythematic delusions encountered in schizophrenia, which is in adequacy with Brendan Maher's account of delusions. Polythematic delusions are considered here as the conclusions of arguments triggered by apophenia that include some very common errors of reasoning such as post hoc fallacy and confirmation bias. We describe firs...