Objective: Is the presence of comorbid attention deficit/hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) related to executive functioning (EF) deficits for children and adolescents? This study aims to expand clinical understanding of typical and atypical development using performance-based measures of EF. Method: In a research setting, Children/adolescents, ages 7-15 (N = 124), completed EF measures of planning (DKEFS-Tower), generativity (NEPSY-VF), and auditory working memory (WISC-IV-DS). Four diagnostic groups determined by clinical psychologists and psychiatrists using standardized diagnostic interviews and assessments include: Typically Developing (TD; N = 67), ASD (N = 10), ASD/subthreshold ADHD (N = 16), and comorbid ASD/ADHD (N = 31). Results: A Kruskal-Wallis H test yielded statistically significant differences on measures of WISC-IV-DS, χ2(3) = 28.439, p = < .001; DKEFS-Tower, χ2(3) = 41.315, p = < .001; and NEPSY-VF, χ2(3) = 19.904, p = < .001. Follow-up tests were conducted to evaluate pairwise differences among the...

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