This result suggests that – in the context of a relatively long and high demanding inhibition task – attentional lapses may be predominately expressed on those ADHD patients carrying at least one copy of the 7R or 2R VNTR variants of DRD4. This finding is in accordance with other works, which associate DRD4 with severity of ADHD symptoms of impulsivity (44) and inattention (45). Here, DRD4 is linked to attention deficit-hyperactivity disorder.