“…For example, the orbitofrontal cortex and anterior cingulate cortex have been shown to underlie impulsive action, such as disinhibition and lack of motor control in preclinical studies (Jentsch, et al, 2014), suggesting neurobiological alterations in these areas may be present prior to the initiation of MA use. It should be recognized that premorbid neural markers related to impulsivity may be moderated by other risk factors for adolescent/young adult substance use, such as drug availability and peer substance use, which are also related to MA use (Embry, Hankins, Biglan, & Boles, 2009; Russell, et al, 2008; Wood, et al, 2008). Furthermore, the current findings are supported in part by a cross-sectional study examining impulsivity as an endophenotype, in which the authors found that siblings of stimulant users also had higher levels of self-reported impulsivity on the BIS-11 relative to controls, suggesting this trait may be both a risk endophenotype present in non-drug users and a personality trait related to stimulant use (Ersche, Turton, Pradhan, Bullmore, &Robbins, 2010).…”