Defense Date


Document Type


Degree Name

Master of Science



First Advisor

Joshua M. Langberg


The positive illusory bias (PIB) – over-reporting levels of self-competence compared to other raters – has been demonstrated in youth with attention-deficit/hyperactivity disorder (ADHD), despite increased impairment rates. However, due to inconsistent definitions of the PIB, conflicting findings have emerged regarding prevalence of the PIB in youth with ADHD and whether parent or child report is actually “biased” and driving the PIB. Additionally, stability of the PIB across time is unknown. The present study used person-centered methodology cross-sectionally and longitudinally to evaluate the prevalence of the PIB in adolescents with ADHD. Results revealed a cross-domain global PIB group at baseline (18.4% of sample) but only a small social PIB group was present and stable across time. Parents in the PIB group were better reporters of scholastic competence relative to an objective measure than were youth. These findings suggest that the PIB may be significantly less prevalent in this population than previously thought.


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