While the aforementioned studies used samples that included both young children and adolescents, subsequent research focusing specifically on motor function in older individuals are equivocal about whether the observed deficits persist into adolescence and adulthood. Young children with histories of heavy prenatal alcohol exposure exhibit slower motor reaction time on both simple and choice reaction time tasks (Simmons, et al., 2002). However, in a subsequent study with adolescent subjects, group differences were not observed (Simmons, Thomas, Levy, & Riley, 2006). Another study investigating fine motor coordination and balance in two adult populations with FASD, including a prospective longitudinal sample of adults who were exposed to varying levels of alcohol, reported results to the contrary. Data revealed that adults with FASD perform worse than controls on tests of fine motor control and balance and that the dose-dependent effects of alcohol on motor coordination during childhood continued to be apparent in adulthood among individuals previously diagnosed with FAS or ARND (Connor, Sampson, Streissguth, Bookstein, & Barr, 2006). It is possible that the discrepancies between studies are because each examined different aspects of
