“…Furthermore, while some studies have supported relationships between ADHD and difficulties with inhibition, attention, and working memory (Antshel et al, 2010;Epstein et al, 1998;Forbes, 1998;Gropper and Tannock, 2009), the effect sizes have been moderate, and many individuals with ADHD did not show executive dysfunction (Nigg, 2013;Willcutt et al, 2005). Most of the executive functioning measures were reliant on processing speed (Advokat et al, 2007;Lipszyc and Schachar, 2010), and several studies suggested that slower reaction times and reaction time variability were more strongly associated with ADHD than actual omission, commission, or other outright executive functioning errors (Advokat et al, 2007;Alderson et al, 2007;Bedard and Tannock, 2008;Metin et al, 2013). Working memory difficulties appeared a bit more consistent according to some meta-analyses (Kasper et al, 2012;Martinussen et al, 2005).…”