A Critical Evaluation of the Reflective Functioning Questionnaire
The Reflective Functioning Questionnaire (RFQ-8) is a short self-report measure of reflective functioning (i.e., the ability to understand mental states of the self and others) that is presumed to capture individual differences in hypo- and hypermentalizing. Despite its broad acceptance by the field and its regular use in primary investigations of the construct, we argue that the validity of the measure is still not well established. The current research elaborates on why the proposed scoring procedure may be methodologically problematic, the item content might not sufficiently cover the full breadth of the mentalizing construct, and it is unclear whether the measure captures mentalizing processes in particular or rather general psychological impairment. In a clinical sample (N = 861) and a sample of young adults (N = 566), we explore these critical considerations and demonstrate that the RFQ-8 may assess a single latent dimension related to hypomentalizing, but provides little unique variance above and beyond broad dimensions of personality pathology and is unlikely to capture maladaptive forms of hypermentalizing. The findings cast doubt on the validity of the RFQ-8 as a measure of reflective functioning. Future research should increase validation efforts concerning the RFQ-8 or develop new measures of reflective functioning.