The measurement of reflective function in adolescents with and without borderline traits.

Reflective function refers to the capacity to reflect on the mind of self and others in the context of the attachment relationship. Reflective function (and its conceptual neighbor, mentalizing) has been shown to be an important correlate of a variety of disorders, including borderline personality disorder (BPD). The current study examined the construct validity of the Reflective Function Questionnaire for Youths (RFQY) in an inpatient sample of adolescents. Adequate internal consistency was established for the RFQY. Significant positive associations with an interview-based measure of reflective function and an experimental-based assessment of mentalization were found for the RFQY. Strong negative relations with BPD features were found and adolescent patients who scored above clinical cut-off for BPD symptoms demonstrated significantly poorer reflective function compared to patients without the disorder. These findings provide preliminary support for the notion that reflective function can be validly and reliably assessed in adolescent populations.