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  • Title: Cognitive endophenotypes of attention deficit/hyperactivity disorder and intra-subject variability in patients with autism spectrum disorder.
    Author: Biscaldi M, Bednorz N, Weissbrodt K, Saville CWN, Feige B, Bender S, Klein C.
    Journal: Biol Psychol; 2016 Jul; 118():25-34. PubMed ID: 27143193.
    Abstract:
    Autism spectrum disorder (ASD) and attention-deficit/hyperactivity disorder (ADHD) have previously been studied mainly in isolation from each other. However the two conditions may be aetiologically related and thus show overlap in aetiologically relevant functions. In order to address this question of potential aetiological overlap between ADHD and ASD, the present study set out to investigate putative endophenotypes of ADHD in N=33 typically developing (TD) children and N=28 patients with ASD that were (ASD+) or were not (ASD-) co-morbid for ADHD. With regard to both the cognitive endophenotype candidates (working memory, inhibition, temporal processing) and intra-subject variability (ISV) the pattern of abnormalities was inconsistent. Furthermore, the overall profile of ASD-TD differences was extremely similar to the pattern of differences between the ASD+ and ASD- sub-groups, suggesting that any abnormalities found were due to the comorbid ASD subgroup. This held in particular for ISV, which did not show in patients with ASD the task-general increase that is common in ADHD samples. Altogether, the present results do not support the hypothesis of aetiological overlap between ASD and ADHD.
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