DRD4 and attention deficit-hyperactivity disorder: Moreover, in 3 of the 17 CpG sites linked to the DRD4 gene, associations with the Cue-P3 were nominally significant (p < 0.05) which can be seen in line with the findings of Albrecht et al. (2014) that processes triggering the Cue-P3 response may be influenced by DRD4 7 R polymorphisms (also mildly associated with ADHD) or the study by Gizer & Waldman36 reporting DRD4 7 R related to inattention.