SUD (Moffit, 1993: Nigg et al., 2004; Tarter, et al. 2003) anticipate that ECF and impulsivity will be inversely related. Consistent with this expectation, an intervention to improve working memory ability in children ages 7 to 12 with ADHD found that the resulting improvements in ECF were accompanied by reductions in parent reports of impulsive tendencies (Klingberg, Fernell, Olesen, Johnson, Gustaffson, Dahlstrom, et al., 2005).