Lee et al. (2012) assessed dopamine receptor DRD4 polymorphisms and the DMN in normal subjects. These authors found that subjects bearing long, ADHD-risk DRD4 alleles (>4R) had decreased resting state EEG connectivity strength, bilaterally in frontal–parietal and in right temporo-frontal connections (Lee et al., 2012). Here, DRD4 is linked to attention deficit-hyperactivity disorder.