Assessing Deictic Relational Responding in Psychosis Using the Implicit Relational Assessment Procedure

The current study sought to investigate perspective-taking in a group of individuals diagnosed with psychosis. The Psychosis Implicit Relational Assessment Procedure (Psychosis-IRAP) contrasted statements and questions referring to 'psychotic' and 'non-psychotic' experiences. The IRAP and a Faux-pas (Theory of Mind) test were presented to two groups of participants: a clinical group with a diagnosis of psychosis and a control group. IRAP effects for each group were in the predicted direction and a ROC analysis showed that the IRAP correctly classified 80% of the individuals with psychosis with a sensitivity level of 84.2% and a specificity level of 27.8%. The IRAP was thus successfully used to correctly classify the population of clinical individuals. However, the study also demonstrated that the two groups were similar with regard to their level of competency on the perspective-taking IRAP. The article also discusses the relationship between the data and recent developments in RFT, in terms of relational flexibility.