The current project is a student project that is linked to the already approved project: B3840 Developmental pathways to mental health problems. All needed data are available through B3840.

Attention deficit/hyperactivity-disorder (ADHD) is a highly heritable and heterogenous neurodevelopmental disorder associated with a range of cognitive deficits and functional outcomes. The complex pathways in which genetic risk gives rise to traits associated with ADHD remains to be specified. One cognitive phenotype associated with ADHD is Intraindividual Variability (IIV), usually measured as Reaction Time Variability (RTV). How RTV relates to behavioural symptoms of ADHD, and whether it constitutes a specific marker of ADHD or represents a marker of psychopathology in general, is currently debated. A deeper understanding of how genetic risk for ADHD relates to RTV and how RTV in turn relates to ADHD symptoms may have implications for understanding the links between genetic risk, cognition, and behavioural manifestations of ADHD.