“…Moreover, a recent study of nearly 28 000 twins estimated the genetic correlation ( r g ) between clinically-diagnosed ADHD and parent-rated ADHD symptoms at 0.56 and reported that 89% of this association could be attributed to genetic factors (Taylor et al, 2019). Twin and family studies have also elucidated the etiology underlying several cognitive and neurobiological features associated with ADHD (for reviews on current understanding of the neurobiology of ADHD, see Faraone et al, 2021; Miranda, Cox, Alexander, Danev, & Lakey, 2020). ADHD or ADHD traits share genetic factors with various executive functions such as reaction time variability and response inhibition (Crosbie et al, 2013; Kuntsi et al, 2010, 2014; Michelini et al, 2021; Tye, McLoughlin, Kuntsi, & Asherson, 2011) as well as brain-based electroencephalographic (EEG) measures (McLoughlin, Palmer, Rijsdijk, & Makeig, 2014; Michelini et al, 2021; Tye et al, 2011, 2012, 2014).…”