Moreover, the changing effects of certain genes on psychopathic traits from childhood to adolescence [27], a change in the effects of COMT on ADHD from early childhood to middle childhood [60], and the dynamic nature of the COMT gene’s contribution to executive functioning from childhood to adolescence [50] point to a differential effect of Val158Met on psychopathic traits during development. Here, COMT is linked to attention deficit-hyperactivity disorder.