The role of cognitive biases and personality variables in subclinical delusional ideation

Introduction. A number of cognitive biases, most notably a data gathering bias characterised by jumping to conclusions (JTC), and the bias against disconfirmatory evidence (BADE), have been shown to be associated with delusions and subclinical delusional ideation. Certain personality variables, particularly openness to experience, are thought to be associated with schizotypy. Methods. Using structural equation modelling, we examined the association between two higher order subfactors (aspects) of openness to experience (labelled openness and intellect), these cognitive biases, and their relationship to subclinical delusional ideation in 121 healthy, nonpsychiatric controls. Results. Our results suggest that cognitive biases (specifically the data gathering bias and BADE) and the openness aspect are independently associated with subclinical delusional ideation, and the data gathering bias is weakly associated with positive schizotypy. Intellect is negatively associated with delusional ideation and might play a potential protective role. Conclusions. Cognitive biases and personality are likely to be independent risk factors for the development of delusions.