https://www.selleckchem.com/products/fgf401.html Individuals with social anxiety disorder (SAD) experience substantial impairment in close and intimate relationships. To enhance our understanding of this impairment and the way it develops, we examined dyadic opposite sex interactions of individuals with and without SAD. Participants were 160 individuals who formed 80 dyads including either 1 individual with SAD and another nonsocially anxious (NSA) individual (42 experimental dyads), or 2 NSA individuals (38 control dyads). We examined self- and partner-ratings of authenticity of both partners at 3 time points over the course of the 30-min interaction. Multilevel linear models indicated that individuals with SAD reported lower self-authenticity compared to NSA individuals (both compared to their interaction partners and compared to those from control dyads). In addition, increases in self-authenticity during the interaction were significantly lower for the experimental dyads compared to the control dyads. Specifically, both individuals with SAD and their NSA partners experienced lower increases in self-authenticity compared to NSA individuals from the control dyads. We also found that individuals with SAD rated their partners as less authentic compared to both their NSA interaction partners as well as NSA individuals from the control dyads. We discuss our findings in the context of cognitive and interpersonal models and suggest that authenticity may contribute to deleterious maintaining processes of SAD. Clinical implications of our findings are also discussed. (PsycInfo Database Record (c) 2021 APA, all rights reserved).Adolescent psychopathological (i.e., internalizing and externalizing) symptoms are quite prevalent and decrease well-being in adulthood. Parental symptoms can put adolescents at risk for developing psychopathological symptoms. This study examined the reciprocal, longitudinal associations between parental and adolescent internalizing and externalizin