 A study in children ages 8 to 12 to assess EVO cognitive game play. The study examines two populations, children diagnosed with ADHD ADHD and not on medication and neuro-typical children. The investigators plan to evaluate 80 subjects N 40 per group in three site locations over a 29 day study period. The 29 day study period includes 2 in-clinic sessions and 27 days of out-patient game play. During the 27 days of out-patient game play, the subjects will be instructed to play EVO 5 days per week for typically 30 minutes per day 