Momentary borderline personality disorder symptoms in youth as a function of parental invalidation and youth-perceived support.

BACKGROUND Parental invalidation is central to etiological models of borderline personality disorder (BPD). Previous studies relied on retrospective accounts or laboratory observations to examine these associations. There is a dearth of research assessing these constructs in daily life, and limited studies have tested the effect of parental invalidation on BPD symptoms during early adolescence, when BPD onsets. The current study took a dynamic approach to assess parents' validating and invalidating behavior and its effect on youths' BPD symptom expression in daily life, while accounting for parent-perceived helpfulness of these behaviors and youth-perceived support. METHODS A psychiatric sample of 162 early adolescents (age range = 10-14 years; 47% female) and their parent completed a four-day ecological momentary assessment study. Parents reported on the use of validating and invalidating (e.g. punishing and ignoring) behaviors during parent-child conflict, as well as perceived helpfulness of these behaviors. Youth reported on their BPD symptoms and perceived parental support. Multilevel models were used to test the between- and within-person effects of parents' validating and invalidating behaviors, parent-perceived helpfulness and youth-perceived support, and their interaction on youth's momentary expression of BPD symptoms. RESULTS At the between-person level, invalidating behaviors, specifically punishing behaviors, were related to greater BPD symptoms in daily life, while ignoring behaviors were associated with fewer BPD symptoms. Youth-perceived support predicted fewer BPD symptoms. CONCLUSIONS Results underscore the importance of parental invalidation for the expression of BPD symptoms in daily life and also highlight the importance of youth's subjective experience of parental support. Findings are discussed in terms of etiological and intervention models that emphasize a dyadic framework.