Mutations of FOXP2 have been identified in patients with speech and language disorders, ASD, and attention-deficit/hyperactivity disorder (Co et al. 2020a, b; Lai et al. 2001; Demontis et al. 2019; Reuter et al. 2017; Satterstrom et al. 2020). Here, FOXP2 is linked to attention deficit-hyperactivity disorder.